CN101399368A - Electric core used for secondary lithium battery and preparation - Google Patents
Electric core used for secondary lithium battery and preparation Download PDFInfo
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- CN101399368A CN101399368A CNA2007101522920A CN200710152292A CN101399368A CN 101399368 A CN101399368 A CN 101399368A CN A2007101522920 A CNA2007101522920 A CN A2007101522920A CN 200710152292 A CN200710152292 A CN 200710152292A CN 101399368 A CN101399368 A CN 101399368A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention relates to an electric core of a secondary lithium battery and a preparation method thereof. The preparation method comprises the following steps: electrode mixed materials which are used in the secondary lithium battery are prepared, and the electrode mixed materials comprise the following materials by weight percentages: a. 30-97.9% of anode/cathode active materials; b. 1-40% of a solvent; c. 1-10% of a binding agent; and d. the rest of conductive additive; and the materials are mixed evenly; a produced current collector needed by the anode/cathode and the electrode combined materials of the anode/cathode are put in a mould, the electrode combined materials are evenly pressed on a surface of the anode/cathode current collector, or evenly pressed on two surfaces of the anode/cathode current collector, or evenly pressed on the periphery of the anode/cathode current collector by an extrusion process, and the electrode of the secondary lithium battery having an inner lining or simultaneously having an inner lining and an outer lining is obtained by heating and drying treatment. The method provides electrode shapes required by batteries with various shapes, and the thickness and the density of a pole piece can be made according to the design by a compaction process, therefore the energy density of the battery is improved.
Description
Technical field
The present invention relates to a kind of electrode and processing technology of serondary lithium battery, particularly relate to electric core and preparation method that a kind of serondary lithium battery is used.
Technical background
The electric core of usually said serondary lithium battery is all combined by positive pole, barrier film and negative pole and is formed.At present serondary lithium battery just/negative electrode is a laminated structure, all process by coating process, because pole piece is subjected to the restriction of coating process, the negative or positive electrode material can not be coated with too thickly, thereby cause the energy density of serondary lithium battery not high, and the shape of serondary lithium battery also can only be circular or square, can not make different shape according to people's requirement; Therefore people have to use on the electrical equipment of serondary lithium battery at each, and assembled battery is come in position of specialized designs, bring very many inconvenience to people.In order to address this problem, introduction done in existing many articles, for example denomination of invention is: " a kind of positive/negative plate that is used for the high power waterless electrolyte battery ", having put down in writing this positive/negative plate in this application comprises: substrate and coating, wherein coating one deck plus or minus utmost point active material coating on substrate is shaped on concavo-convex decorative pattern on described plus or minus utmost point active material coating.Adopt on the plus or minus utmost point active material coating and be shaped on concavo-convex decorative pattern, improve the energy density of serondary lithium battery exactly for increased area.But still fail to cut the energy density problem of end solution pole piece, still be subjected to the restriction of coating process.The technology that the present invention takes is cut the end and has been broken the limitation of ready-made coating process.
Summary of the invention
The objective of the invention is to: the pole piece that overcomes above-mentioned existing serondary lithium battery is applied the restriction of processing technology, and coating battery pole piece can not be got bed thickness, causes the low density defective of the energy content of battery; And making battery electrode technology in the past can not make wide variety of shapes with battery pole piece, particularly can not make special-shaped battery electrode, makes cell shapes also be restricted, and do not satisfy the defective of industrial needs; Thereby provide a kind of vibrations, extrusion forming process, the pole piece of the difformity that makes and the battery of different-thickness or the utmost point piece and preparation method of battery of taking; Therefore this method can make special-shaped battery electrode by the shape or the thickness processing of cell shapes designing requirement, and the energy of battery is close can be improved widely, has also reduced manufacturing cost simultaneously.
The object of the present invention is achieved like this:
The preparation method of serondary lithium battery electricity consumption core provided by the invention may further comprise the steps:
1). at first make the electrode be used for serondary lithium battery (just/negative plate or electrode block) the needed mould of shape;
2). preparation is used for the electrode composite material of serondary lithium battery, calculates by weight percentage, according to following prescription weighing:
A.30-97.9% just/negative active core-shell material; B.1-40% solvent; C.1-10% bonding agent;
D. surplus is a conductive agent; It is mixed, and it is standby to stir;
3). just making/the required corresponding collector of negative pole according to the shaped design of serondary lithium battery, again with step 2) the electrode composite material that mixes with make just/negative current collector is placed in the mould, by extrusion process the electrode composite material just evenly is being compressed on/surface of negative current collector on, perhaps just evenly be compressed on/two surfaces of negative current collector on, perhaps just evenly be compressed on/negative current collector around, form the electrode blank have inner covering or to have the serondary lithium battery of inside and outside lining simultaneously;
4). will from mould, deviate from through the electrode blank after the step 3) compaction treatment, carrying out heating, drying handles, the heating, drying temperature is according to used solvent and adhesive properties decision, the effect that oven dry is handled removes on the one hand and desolvates, activated adhesive again simultaneously, obtain by just/negative current collector serondary lithium battery that forms with the electrode composite material, any shape that designs and thickness just/negative electrode;
5) at last step 4) make just/the outer or negative pole composite material outsourcing of anodal composite material on the negative electrode applies barrier film, anodal, negative pole and barrier film combined the electrode cores of formation serondary lithium battery.
In above-mentioned technical scheme, just described/negative current collector is aluminium/Copper Foil or aluminium/copper mesh, bar or special-shaped shell body that perforation aluminium/Copper Foil or aluminium or copper become;
In above-mentioned technical scheme, comprise that also the mould that step 3) is installed electrode material is placed in the press, electrode material is applied required pressure, further electrode material is done compaction treatment, make it fine and close more.
In above-mentioned technical scheme, described mold shape comprises C shape, E shape or different shape cellular or people's needs, and its mold shape is according to the decision of the profile of required battery.
In above-mentioned technical scheme, described positive electrode active materials comprises: LiMn2O4, LiFePO4, nickel cobalt lithium aluminate, nickle cobalt lithium manganate or lithium vanadate, nickel cobalt lithium aluminate.
Described negative active core-shell material comprises: carbonaceous mesophase spherules, graphite, activated carbon, carbon fiber, silicon-carbon alloy, lithium titanate or carbon nano-tube.
In above-mentioned technical scheme, described solvent comprises: deionized water, N-methyl pyrrolidone, N-methylacetamide or N-methylformamide.
In above-mentioned technical scheme, described bonding agent comprises: ptfe emulsion, Kynoar, butadiene-styrene latex, polyvinyl fluoride, polythiophene or polypyrrole.
In above-mentioned technical scheme, described conductive agent comprises: carbon black, carbon 1-5 micron ball, carbon nano-tube, 1-10 micron copper ball or carbon nano powder.
In above-mentioned technical scheme, carry out heating, drying described in the step 4), be that the shaped electrode material of deviating from from mould is put into vacuum drying chamber, according to the technological parameter infrared ray heating that configures or add microwave heating.
Using the invention described above provides making to be used for the method for serondary lithium battery electricity core, and the electric core that is used for serondary lithium battery of making comprises: positive pole, negative pole and barrier film; It is characterized in that, just described/negative pole be just/collector of negative pole on, by extrusion process the electrode composite material just evenly is being compressed on/surface of negative current collector on, perhaps just evenly be compressed on/two surfaces of negative current collector on, perhaps just evenly be compressed on/negative current collector around, perhaps evenly be compressed on the inwall of negative current collector, form the electrode that has inner covering or have the serondary lithium battery of inside and outside lining simultaneously;
Just described/the negative electrode composite material, calculate by weight percentage, according to following prescription weighing:
A.30-97.9% just/negative active core-shell material; B.1-40% solvent; C.1-10% bonding agent;
D. surplus is a conductive agent.
In above-mentioned technical scheme, by getting half described electrode composite material, put into the mould that makes, the sheet that will have " hilt " shape more just/negative current collector, be placed on this electrode composite material in the mould, then the electrode composite material of remainder poured in the mould, just covering/the negative current collector upper surface, and " hilt " be exposed, this collector lower end just is being embedded in/centre of negative material; Charged mould is shaken and compacting, makes it closely knit, make have " hilt " shape sheet just/negative electrode; Add in the mould electrode composite material amount by just/negative plate or electrode block designing requirement decision.
In above-mentioned technical scheme, described collector is for evenly having the aluminium/Copper Foil of aperture, or with aluminium/copper mesh, bar that perhaps is made of aluminum or copper or special-shaped shell body.
In above-mentioned technical scheme, bar that is made of aluminum or copper or special-shaped shell body, by extrusion process the electrode composite material just evenly is being compressed on/surface of negative current collector on, perhaps just evenly be compressed on/two surfaces of negative current collector on, perhaps just evenly be compressed on/negative current collector around, between both positive and negative polarity, isolate, form the electrode that has inner covering or have the serondary lithium battery of inside and outside lining simultaneously by barrier film;
In above-mentioned technical scheme, described special-shaped shell body comprises the shape of C shape, E shape, animal shape, flower or cellular, and its mold shape is according to the profile decision of required battery.
In above-mentioned technical scheme, described negative current collector is a Copper Foil, this negative current collector makes a square shell, by extrusion forming process the described negative active core-shell material of one deck is compressed on the square shell inwall that described negative current collector makes, form " recessed " font negative plate, described band inserts the anodal piece that is surrounded by barrier film the breach interior (shown in Fig. 3 and 4) of being made " recessed " font negative plate by negative material.Otherwise positive electrode can be made " recessed " font shape, the negative material that is surrounded by barrier film is made circular or square piece, insert and make in " recessed " font, form the electric core of serondary lithium battery by positive electrode.
In above-mentioned technical scheme, described negative pole is made cellular, wherein the eye in the honeycomb block is circular or square, opens aperture 8 between this cellular eye and eye, inserts the circular or negative current collector 1 of square copper bar that matches with it in this aperture 8; Described plus plate current-collecting body 3 aluminium bars are round bar or square bar, on these plus plate current-collecting body 3 mid portion outer surfaces, be provided with the anodal composite material 4 of one deck, form the aluminium bar at the circle of centre or the positive pole of square pole, outside this positive pole, be surrounded by barrier film, insertion is made cellular intraocular by negative material, and the internal diameter size that anodal piece and negative material are made cellular eye is complementary; Otherwise positive electrode is made cellular, be surrounded by the circular or square bar that the negative material of barrier film is made, insert and make cellular intraocular by positive electrode; The profile that forms serondary lithium battery electricity core can determining according to people's needs.
In above-mentioned technical scheme, described negative current collector is the square shell that Copper Foil is done, as " recessed " font, by extrusion process negative material evenly is pressed in the inwall of " recessed " font shell, form " recessed " word inwall one deck battery cathode layer evenly is set, in the middle of negative electrode layer, form anodal cavity; Positive electrode and described collector aluminium bar is compressed together, form the square positive pole of aluminium bar in the centre, and the aluminium bar at the centre of square positive pole one distal process for the positive electrode piece, an end is embedded in the positive electrode sheet (as illustrated in Figures 5 and 6).Square anodal piece is surrounded by one deck barrier film, is inserted in the anodal cavity, make the electric core of a square housing battery; Otherwise positive electrode can be made square shell, negative material is made circular or square piece, is surrounded by one deck barrier film in the outside of negative pole piece, inserts and is made in the square shell by positive electrode, makes the electric core of a square housing battery.
In above-mentioned technical scheme, described negative current collector is the hemispherical shell that Copper Foil is done, negative material evenly is pressed in the inwall of hemispherical shell by extrusion process, form the hemisphere inwall one deck negative material evenly is set, two the same hemispherical shell are lumped together, and having formed in the middle of negative electrode layer has the battery cathode of anodal cavity shell; Positive electrode and described plus plate current-collecting body aluminium bar is compressed together, form the spherical cathode of band rod, plus plate current-collecting body aluminium bar one end is in the middle of positive electrode, and outstanding positive electrode sheet, the other end is embedded in anodal ball that (shown in Fig. 7 and 8) in the spherical cathode material will be surrounded by barrier film and is inserted in the anodal cavity in the battery cathode shell, forms the electric core of a spherical shell battery.Otherwise positive electrode can be made hemispherical shell, negative material is made the sphere of band rod, the negative pole that is surrounded by barrier film is inserted made in the anodal cavity of hemispherical shell by positive electrode, forms the electric core of a spherical shell battery.
In above-mentioned technical scheme, described collector shell shape can be the shape that hemisphere, semi-circular and so on people need, the positive pole that will have a lug is made with the shape of negative pole coupling and is wrapped barrier film and put into two negative electrode casings and lump together formed cavity, has so just made the electric core by the hull shape battery of the different shape of people's needs.
Compared with the prior art the present invention has following effect:
Preparation serondary lithium battery of the present invention just/negative plate or electrode block have:
Just making/negative plate by coating process at present, can only do squarely or circular batteries and use. and can not do special shape, abnormity such as C shape, E shape for example, preparation method provided by the invention has just solved this industry difficult problem.Preparation serondary lithium battery of the present invention just/method of negative plate or electrode block, realized by designing requirement make serondary lithium battery just/negative plate or electrode block add barrier film, and is combined into electric core thus, therefore also can make the battery of different shape.
Existing technology will be by coating, pole piece thickness just is restricted, adopting in addition will be just/negative plate folding mode or winding method, increase pole piece thickness, but this brings between pole piece the space more simultaneously, so energy density is low, and preparation method provided by the invention is by compacting, make electrode material reach desired density and thickness, and energy content of battery density is improved.
Existing complex process, the cost height, by coating, efficient has not improved preparation method provided by the invention widely, and the battery separator amount of simultaneously same capacity is little, low cost of manufacture.
Utilize existing coating process just manufacturing/method of negative plate, minimum solvent is more than 40%, and preparation method provided by the invention solvent for use at most just 40% when being shaped reduced solvent load, so cost is reduced widely also.
Description of drawings
Fig. 1 cathode pole piece generalized section of the present invention
Fig. 2 anode pole piece generalized section of the present invention
Fig. 3 is Fig. 4 " recessed " font negative pole vertical view
Fig. 4 " recessed " of the present invention font negative pole generalized section
Fig. 5 is the corresponding anodal generalized section of the negative pole of the present invention and Fig. 4
Fig. 6 is the generalized section of the another kind of negative pole structure embodiment of the present invention
Fig. 7 is the schematic diagram with the corresponding positive electrode structure embodiment of Fig. 6
The generalized section of another positive electrode structure embodiment of Fig. 8 the present invention
Fig. 9 is the generalized section with the corresponding negative pole structure embodiment of Fig. 8
The generalized section of another positive electrode structure embodiment of Figure 10 the present invention
Figure 11 is and the explanation of the generalized section drawing of the corresponding negative pole structure embodiment of Figure 10:
The electrode composite material of 1-plus plate current-collecting body 2-positive pole
The electrode composite material of 3-negative current collector 3-negative pole
The anodal cavity 6-of 5-collector passes the hole
7-negative pole chamber 8-aperture
The anodal 10-negative pole of 9-
11-barrier film 12-eye
Embodiment
Below in conjunction with preparation method and accompanying drawing the present invention is described in detail
With reference to figure 1, making one is used for the electric core of serondary lithium battery, comprising: positive pole, negative pole and barrier film; Just described/negative pole be just/collector of negative pole on, by extrusion process the electrode composite material just evenly is being compressed on/surface of negative current collector on, perhaps just evenly be compressed on/two surfaces of negative current collector on, formation has inner covering or has the electric core of the serondary lithium battery of inside and outside lining simultaneously, and the concrete preparation process of this electricity core is as follows:
1). at first make a mould, this mould is a square box;
2). preparation is used for the anodal composite material of serondary lithium battery, calculates by weight percentage, according to following prescription weighing:
A. the positive electrode active materials LiMn2O4 gets 60%;
B. solvent adopts the N-methyl pyrrolidone, and its consumption is 16%;
C. bonding agent adopts Kynoar, and its consumption is 5%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed, and stir and can make anode composite material.
This secondary lithium battery cathode electrode composite material is calculated by weight percentage, according to following prescription weighing:
A. the negative active core-shell material MCMB gets 50%;
B. solvent adopts deionized water, and its consumption is 20%;
C. bonding agent adopts butadiene-styrene latex, and its consumption is 5%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed, and stir and can make the negative pole composite material;
3). according to the shape of serondary lithium battery, sheet plus plate current-collecting body 1 and negative current collector 3 that design one has " hilt " shape, this just/negative current collector is aluminium/Copper Foil, and evenly has aperture on aluminium/Copper Foil, or make with aluminium/copper mesh; Earlier with step 2) the positive electrode composite material 2 that mixes, be placed on respectively in 2 moulds with half amount of negative electrode composite material 4, then on this electrode composite material, place just corresponding/negative current collector respectively, again respectively second half amount of remainder just/the negative electrode composite material is poured on just corresponding/negative current collector, just cover/the negative current collector upper surface, and " hilt " be exposed, the lower end of this collector is embedded in the electrode composite material, promptly the length of collector less than made just/negative electrode length; Charged mould is shaken and compacting, makes it closely knit, the sheet that has " hilt " shape just/negative current collector two surface forms the linings of 2 millimeters thick, formed the electrode blank that has the serondary lithium battery of inside and outside lining simultaneously;
Can also with just/surface of negative current collector on, evenly compacting is thereon with the electrode composite material by extrusion process.
4). will from mould, deviate from through the electrode blank after the step 3) compaction treatment, carrying out heating, drying handles, the heating, drying temperature is 80-150 degree centigrade, the effect that oven dry is handled removes on the one hand and desolvates, activated adhesive again simultaneously, the shape that is designed arbitrarily and the serondary lithium battery of thickness just/negative electrode (with reference to figure 1).
With the above-mentioned just ready-made or coated barrier film of going up in negative electrode outside, arrange the electric core of promptly forming serondary lithium battery between a positive negative.
With reference to figure 3 and 4, make the negative electrode casing of a rectangular cell, this negative current collector 3 is the copper coin of 0.2 millimeters thick, and it is 30 millimeters square shell that this negative current collector 3 makes a length of side, and this square shell is a hollow, and becoming a length of side is 18.6 millimeters anodal cavity; Is 6 millimeters negative pole composite materials by extrusion forming process with a layer thickness, is compressed on the inwall of the square shell that negative current collector makes, and forms the negative pole 10 (as shown in Figure 3) that has liner " recessed " font housing.
With reference to figure 5, make the positive pole of a rectangular cell, wherein plus plate current-collecting body 1 adopts circular or square copper bar, around plus plate current-collecting body 1, suppress the last layer anode composite material, form the length of side and be 18 millimeters square, and outside anode composite material, be surrounded by the barrier film of one deck 40 micron thickness, make block anodal 9 of a band handle, this positive pole 9 inserts the anodal cavity 5 interior (as shown in Figure 4) of being made " recessed " font by negative material, makes the used electric core of a square cell.Otherwise positive electrode can be made concavity, negative material is made circular or square bar, and its outside is surrounded by barrier film, is inserted into by positive electrode and makes in the negative pole chamber of " recessed " font, forms the electric core of serondary lithium battery.
Another kind of embodiment can also be arranged, described positive pole makes two housings by aluminium, these two shell combination form the plus plate current-collecting body 3 of " recessed " font together, earlier be compressed on anodal composite material 4 on plus plate current-collecting body 3 internal faces of " recessed " font by extrusion forming process, again the shell of two " recessed " fonts is lumped together, be negative pole cavity 7 in the middle of it, and the center is opened a collector and is passed hole 6 (as shown in Figure 6) on of " recessed " font.
The negative current collector 1 that described negative pole is made by the copper bar of 1 " ∏ " shape, with negative pole composite material 2 be compressed on this negative current collector 1 around, form the negative pole piece of 1 " " ∏ font, wherein a distal process of the negative current collector 1 in the negative pole piece is for the negative pole piece, negative pole one end in the other end negative pole piece is embedded in the negative pole composite material (as shown in Figure 7), coated one deck barrier film outside the negative pole composite material inserts this negative pole piece by in the negative pole cavity 7 again, makes the electric core of " ∏ " shape housing battery.Otherwise negative material can be made " recessed " font negative electrode casing, positive electrode is made 2 " ∏ " shapes, and the anodal piece that is surrounded by barrier film is inserted in the anodal cavity, makes the electric core of " ∏ " shape housing battery.
Negative electrode composite material in the present embodiment is calculated by weight percentage, according to following prescription weighing:
A. the negative active core-shell material native graphite gets 50%;
B. solvent for example adopts deionized water, and its consumption is 13%;
C. bonding agent for example adopts polytetrafluoroethyldispersion dispersion, and its consumption is 6%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make the negative pole composite material.
Anode electrode composite material in the present embodiment is calculated by weight percentage, according to following prescription weighing:
A. iron phosphate serving as positive active material gets 50%;
B. solvent for example adopts the N-methyl pyrrolidone, and its consumption is 18%;
C. bonding agent for example adopts Kynoar, and its consumption is 7%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make anodal composite material.
Embodiment 3
With reference to figure 8, present embodiment is to make the electric core that spherical battery is used, negative current collector 1 is that to do 2 radiuses be 8 millimeters hemispherical shell to the copper shell of 0.1 millimeters thick, to bear in the inwall that material evenly is pressed into hemispherical shell by extrusion process, forming the hemisphere inwall, evenly to have pushed a layer thickness be the negative pole composite material of 2 millimeters thick, and 2 hemispherical shell are docking together, and to form middle radius be the structure (as shown in Figure 8) of 5.9 millimeters anodal cavity.
With anodal composite material and described plus plate current-collecting body, plus plate current-collecting body 3 is that 0.8 millimeter aluminium bar is compressed together for radius, the radius that forms the band rod is 5.5 millimeters a spherical cathode, the outstanding positive electrode in aluminium bar upper end of plus plate current-collecting body 3, the lower end is embedded in the anode composite material, and be surrounded by 32 microns barrier film (as shown in Figure 9) outside anodal composite material, and this end that will be surrounded by barrier film is embedded in the anodal cavity in centre of spherical negative material in 7, forms the electric core of serondary lithium battery.Otherwise positive electrode can be made hemispherical shell, negative material is made the spherical of band rod, is surrounded by barrier film on it, inserts and is made in the negative pole cavity of hemispherical shell by positive electrode, forms the electric core of serondary lithium battery.
Electrode composite material in the present embodiment is calculated by weight percentage, according to following prescription weighing:
A. positive electrode active materials nickel cobalt lithium aluminate gets 60%;
B. solvent adopts the N-methylformamide, and its consumption is 20%;
C. bonding agent adopts polyvinyl fluoride, and its consumption is 8%;
D. surplus is a conductive agent, and conductive agent is the carbon nano powder, above-mentioned each material is mixed can make anodal composite material.
The negative electrode composite material is calculated by weight percentage, according to following prescription weighing:
A. negative active core-shell material is that activated carbon fiber gets 56%;
B. solvent adopts N-methyl arsenic pyrrolidone, and its consumption is 20%;
C. bonding agent adopts Kynoar, and its consumption is 8%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make the negative pole composite material.
With reference to Figure 10, present embodiment is to make the electric core that cylindrical battery is used, inside radius is 10 millimeters, outer radius is 30 millimeters, the negative current collector 1 of the negative pole 10 of this electricity core is a bronze medal bar, this copper bar is that a diameter is 0.2 millimeter a round bar, perhaps the length of side is 0.2 millimeter a square bar (shown in Figure 11), with the composition all around that anode material 2 is compressed on this negative current collector 1 middle part by extruding, the thickness of its anode material 2 is decided according to the energy requirement of designed cylindrical battery, on the collector outer surface for the copper bar, the external diameter of the negative pole composite material 2 that is pushed is Φ 3.9mm in the present embodiment.
Positive pole is made cellular, anodal tile height 10.5mm; Wherein the eye in the honeycomb 12 can be an internal diameter Φ 4mm circle, or length of side 4mm's is square, and this eye is negative pole chamber 7 (shown in Figure 10); Between this cellular eye and eye, open aperture 8, in this aperture 8, insert the circular or negative current collector 1 of square copper bar that matches with it, form electric core of the present invention.
Perhaps positive electrode and described collector Φ 0.5mm aluminium bar is compressed together by extrusion process, form the positive pole of aluminium bar at the Φ of centre 3.9mm circular pin, outside this positive pole, be surrounded by barrier film, insertion is made by negative material in the cellular eye Φ 4mm, anodal bar and negative material make cellular internal diameter size be complementary; Otherwise positive electrode can be made cellular, negative material is made circular or square bar, inserts and makes cellular intraocular by positive electrode, forms the electric core of serondary lithium battery.
The electrode composite material of the positive pole in the present embodiment is calculated by weight percentage, according to following prescription weighing:
A. the positive electrode active materials lithium vanadate gets 60%;
B. solvent adopts the N-methylformamide, and its consumption is 20%;
C. bonding agent adopts polyvinyl fluoride, and its consumption is 8%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make anodal composite material.
The electrode composite material of the negative pole in the present embodiment is calculated by weight percentage, according to following prescription weighing:
A. negative active core-shell material is that activated carbon gets 56%;
B. solvent adopts deionized water, and its consumption is 20%;
C. bonding agent adopts ptfe emulsion, and its consumption is 8%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make the negative pole composite material.
Make positive plate, wherein plus plate current-collecting body 3 is the aluminium flake of 0.1mm thickness, and has the foursquare aperture 8 that the length of side is 0.3mm thereon, and porosity is 25%; Compacting one layer thickness is the positive electrode material layer 4 of 2mm on this plus plate current-collecting body 3, i.e. single face;
Make negative film, wherein negative current collector is the copper sheet of 0.05mm thickness, and has the square square hole that the length of side is 0.2mm thereon, and porosity is 40%; Compacting one layer thickness is the negative electrode material layer 2 of 2.4mm on this negative current collector 1, and is promptly two-sided; Just/the negative pole outsourcing applies barrier film, then just/negative pole stacks the serondary lithium battery electricity core of composition.
Electrode composite material in the present embodiment is calculated by weight percentage, according to following prescription weighing:
A. positive electrode active materials cobalt acid lithium gets 55%;
B. solvent adopts the N-methylformamide, and its consumption is 20%;
C. bonding agent adopts polyvinyl fluoride, and its consumption is 5%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make anodal composite material.
The negative electrode composite material is calculated by weight percentage, according to following prescription weighing:
A. negative active core-shell material gets 56% for the carbon nano powder;
B. solvent adopts deionized water, and its consumption is 20%;
C. bonding agent adopts ptfe emulsion, and its consumption is 6%;
D. surplus is a conductive agent, and conductive agent is a carbon black, above-mentioned each material is mixed can make the negative pole composite material.
The collector that used in the above-described embodiments copper or aluminium foil are done, all evenly have aperture 8 on its copper or the aluminium foil, for example the diameter of aperture 8 is 0.2mm, its arrangement mode can array or around the shape perforate by rows (as shown in figure 10) of collector, or random geometry ground is arranged; Also can be provided with according to common mode.Among the wherein above-mentioned embodiment that makes collector of copper or aluminium foil, all can replace with copper mesh or aluminium net,, just differing here one has illustrated for example, because just need not open aperture again with copper mesh or aluminium net, saves operation and time.
Claims (11)
1. one kind prepares the method that is used for serondary lithium battery electricity core, may further comprise the steps:
1). at first make the needed mould of electrode shape that is used for serondary lithium battery;
2). preparation is used for the electrode composite material of serondary lithium battery, calculates by weight percentage, according to following prescription weighing:
A.30-97.9% just/negative active core-shell material; The 1-40% solvent;
B.1-10% bonding agent;
C. surplus is a conductive agent; It is mixed, and it is standby to stir;
3). just making/the required collector of negative pole according to the shaped design of serondary lithium battery, again with step 2) electrode composite material that mixes with make just/negative current collector is placed in the mould, by extrusion process the electrode composite material just evenly is being compressed on/surface of negative current collector on, perhaps just evenly be compressed on/two surfaces of negative current collector on, perhaps just evenly be compressed on/negative current collector around, form the electrode blank have inner covering or to have the serondary lithium battery of inside and outside lining simultaneously;
4). will deviate from from mould through the electrode blank after the step 3) compaction treatment, and carry out heating, drying and handle, the heating, drying temperature is according to used solvent and adhesive properties decision, the shape that is designed arbitrarily and the serondary lithium battery of thickness just/negative electrode;
5) at last outside the positive electrode composite material or the outsourcing of negative electrode composite material apply barrier film, positive electrode and negative electrode and barrier film are combined the electric core that forms serondary lithium battery.
2. be used for the method for serondary lithium battery electricity core by the described preparation of claim 1, it is characterized in that described positive electrode active materials comprises: LiMn2O4, LiFePO4, nickel cobalt lithium aluminate, nickle cobalt lithium manganate or lithium vanadate;
Described negative active core-shell material comprises: carbonaceous mesophase spherules, graphite, activated carbon, carbon fiber, silicon-carbon alloy, lithium titanate or carbon nano-tube.
3. be used for the method for serondary lithium battery electricity core by the described preparation of claim 1, it is characterized in that described solvent comprises: deionized water, N-methyl pyrrolidone, N-methylacetamide or N-methylformamide.
4. be used for the method for serondary lithium battery electricity core by the described preparation of claim 1, it is characterized in that described bonding agent comprises: ptfe emulsion, Kynoar, butadiene-styrene latex, polyvinyl fluoride, polythiophene or polypyrrole.
5. be used for the method for serondary lithium battery electricity core by the described preparation of claim 1, it is characterized in that described conductive agent comprises: carbon black, diameter are that 1-5 carbon micron-spheres, carbon nano-tube, diameter are 1-10 micron copper ball or carbon nano powder.
6. an electric core that is used for serondary lithium battery comprises: anodal (9), negative pole (10) and barrier film (11); It is characterized in that, described positive pole (9) is on plus plate current-collecting body (3), evenly be compressed on the surface of plus plate current-collecting body (3) by the electrode composite material of extrusion process positive pole, perhaps evenly be compressed on the upper and lower surface of plus plate current-collecting body (3), perhaps evenly be compressed on plus plate current-collecting body (3) around, perhaps evenly be compressed on the inwall of plus plate current-collecting body (3), form anodal composite material inner covering or have the inside and outside lining of anodal composite material simultaneously; Described negative pole (10) is on negative current collector (1), evenly be compressed on the surface of negative current collector (1) by the electrode composite material of extrusion process negative pole, perhaps evenly be compressed on the upper and lower surface of negative current collector (1), perhaps evenly be compressed on negative current collector (1) around, perhaps evenly be compressed on the inwall of negative current collector (1), form negative pole composite material inner covering or have the inside and outside lining of negative pole composite material simultaneously; The coated barrier film (11) of going up is combined the electric core that forms serondary lithium battery with anodal (9) and negative pole (10) and barrier film (11) on the electrode composite material outside anodal (9) or negative pole (10);
Just described/the negative electrode composite material, calculate by weight percentage, according to following prescription weighing:
A.30-97.9% just/negative active core-shell material; B.1-40% solvent; C.1-10% bonding agent;
D. surplus is a conductive agent.
7. by the described electric core that is used for serondary lithium battery of claim 6, it is characterized in that, described collector is for evenly having the aluminium foil or the Copper Foil of aperture, or with aluminium/copper mesh, bar that perhaps is made of aluminum or copper or special-shaped shell body, described special-shaped shell body or bar comprise C shape, E shape, ∏ " shape, sphere, bar, sheet, random geometry, cellular, special-shaped bar or special-shaped shell body.
8. by the described electric core that is used for serondary lithium battery of claim 6, it is characterized in that, described negative current collector is a Copper Foil, this negative current collector makes a square shell, by extrusion forming process the described negative pole composite material of one deck is compressed on the square shell inwall that described negative current collector makes, form " recessed " font negative electrode casing, described band inserts the anodal piece that is surrounded by barrier film and is made in the breach of " recessed " font negative electrode casing by negative material, forms the electric core of serondary lithium battery; Otherwise positive electrode can be made " recessed " font shape, the negative material that is surrounded by barrier film is made circular or square piece, insert and make in " recessed " font, form the electric core of serondary lithium battery by positive electrode.
9. by the described electric core that is used for serondary lithium battery of claim 6, it is characterized in that, described negative pole is made cellular, wherein the eye in the honeycomb block is circular or square, between this cellular eye and eye, open aperture (8), the circular or negative current collector (1) of square copper bar that insertion matches with it in this aperture (8); Described plus plate current-collecting body (3) aluminium bar is round bar or square bar, on this plus plate current-collecting body (3) mid portion outer surface, be provided with one deck anode composite material (4), form the aluminium bar at the circle of centre or the positive pole of square pole, outside this positive pole, be surrounded by barrier film, insertion is made cellular intraocular by negative material, and the internal diameter size that anodal piece and negative material are made cellular eye is complementary; Perhaps positive electrode is made cellular, be surrounded by the circular or square bar that the negative material of barrier film is made, insert and make cellular intraocular by positive electrode.
10. by the described electric core that is used for serondary lithium battery of claim 6, it is characterized in that, described negative current collector is the hemispherical shell that Copper Foil is done, in this hemispherical shell inner wall surface one deck negative pole composite material is set, two the same hemispherical shell are lumped together the middle negative pole spherical shell that forms an anodal cavity (7); The coated spherical cathode composite material of one end of the plus plate current-collecting body (3) that the aluminium bar is made, the plus plate current-collecting body other end is embedded in the centre of positive electrode composite material, barrier film is coated outside anodal ball, form the spherical cathode of band rod, this spherical cathode is inserted in the interior anodal cavity of battery cathode shell, forms the electric core of a spherical serondary lithium battery; Perhaps anodal composite material is made hemispherical shell, anode material is made the sphere of band rod, the negative pole that is surrounded by barrier film is inserted made in the anodal cavity of hemispherical shell by anode composite material, forms the electric core of a spherical serondary lithium battery.
11. by the described electric core that is used for serondary lithium battery of claim 6, it is characterized in that, described positive pole is made the anodal aluminum hull of two " recessed " fonts by aluminium, and the plus plate current-collecting body (3) that forms, anodal composite material (4) is compressed on plus plate current-collecting body (3) internal face of " recessed " font by extrusion forming process, with two " recessed " fonts lump together, be negative pole cavity (7) in the middle of it, and the center is opened a collector and is passed hole (6) on of " recessed " font;
The negative current collector (1) that described negative pole (10) is made by the copper bar of 1 " ∏ " shape, negative pole composite material (2) be compressed on this negative current collector (1) around, form the negative pole (10) of " ∏ " shape of a bulk, one distal process of the negative current collector (1) in this negative pole (10) goes out this negative pole, the other end of negative current collector (1) is embedded in the negative pole composite material (2), coated one deck barrier film (11) outside negative pole composite material (2), again this negative pole is inserted by in the negative pole cavity (7), make the electric core of " ∏ " shape housing battery; Perhaps negative pole (10) is made " recessed " font housing by the negative pole composite material, described anodal composite material is made block anodal (9) of two " ∏ " shapes, the positive pole (9) that will be surrounded by barrier film (11) inserts in the anodal cavity, makes the electric core of " ∏ " shape housing battery.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101522920A CN101399368A (en) | 2007-09-24 | 2007-09-24 | Electric core used for secondary lithium battery and preparation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101522920A CN101399368A (en) | 2007-09-24 | 2007-09-24 | Electric core used for secondary lithium battery and preparation |
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| CN101399368A true CN101399368A (en) | 2009-04-01 |
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| CN102403485A (en) * | 2011-12-05 | 2012-04-04 | 湖北中能锂电科技有限公司 | Pole pieces of lithium battery of aqueous-oily active material electrode and method for producing pole pieces |
| CN102735023A (en) * | 2011-04-07 | 2012-10-17 | 东莞新能源科技有限公司 | Drying method of lithium-ion battery electric core |
| CN104167534A (en) * | 2014-08-06 | 2014-11-26 | 广西卓能新能源科技有限公司 | Novel cylindrical lithium ion battery cell and preparation method thereof |
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| CN102735023A (en) * | 2011-04-07 | 2012-10-17 | 东莞新能源科技有限公司 | Drying method of lithium-ion battery electric core |
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| CN104167534B (en) * | 2014-08-06 | 2016-08-17 | 广西卓能新能源科技有限公司 | A kind of method preparing cylinder 18650 lithium ion battery |
| CN106169579A (en) * | 2016-08-29 | 2016-11-30 | 江苏天鹏电源有限公司 | A kind of novel lithium battery |
| CN106299332A (en) * | 2016-11-02 | 2017-01-04 | 天津市捷威动力工业有限公司 | A kind of safe power lithium-ion battery of height using lithium titanate blending graphite cathode sheet |
| CN108963260A (en) * | 2018-07-17 | 2018-12-07 | 大同新成新材料股份有限公司 | A kind of preparation process of lithium battery hard carbon composite negative pole material |
| CN109599586A (en) * | 2018-12-10 | 2019-04-09 | 广东维都利新能源有限公司 | A kind of spherical shape battery |
| CN109599586B (en) * | 2018-12-10 | 2020-06-26 | 广东维都利新能源有限公司 | Spherical battery |
| CN109980291A (en) * | 2019-04-01 | 2019-07-05 | 浙江工业大学 | A kind of battery core and its preparation method and application of cylindrical type lithium-sulfur cell |
| CN112952042A (en) * | 2021-03-08 | 2021-06-11 | 上海兰钧新能源科技有限公司 | Preparation method of paste-mixing brick for lithium ion battery pole piece |
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