CN105070941A - Lithium ion battery slurry with long service life and preparation method of lithium ion battery slurry - Google Patents
Lithium ion battery slurry with long service life and preparation method of lithium ion battery slurry Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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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
Abstract
The invention discloses lithium ion battery slurry with long service life and a preparation method of the lithium ion battery slurry. Cathode slurry of the lithium ion battery slurry is prepared from the following components: lithium cobaltate, polyvinylidene fluoride, carbon nano tubes and Super P; and anode slurry is prepared from the following components: graphite, sodium carboxymethylcellulose, butadiene styrene rubber and the Super P. According to the preparation method, the Super P is ingeniously combined with the carbon nano tubes (CNTs); the Super P is taken as points; and the CNTs are taken as lines; the Super P in a positive plate is embedded into a gap between two active material particles; the CNTs cover the surfaces of the active material particles as chains; the points and the lines form a conducting network; the conducting effect of the battery is improved; the consistency is ensured; meanwhile, the CNTs also have electric double layer effects; high rate capability of a super capacitor is put into play; the heat-conducting property is good; polarization of the battery is reduced; the high-and-low temperature performance of the battery is improved; the cycle life of the battery is prolonged; and the overall performance is good.
Description
Technical field
The invention belongs to lithium-ion technology field, be specifically related to a kind of extended-life lithium ion battery slurry.
Background technology
Lithium ion battery is as a kind of function element of clean environment firendly, obtain in increasing field at present and applied more and more widely, such as, in consumer electronics sector, electric automobiles, energy-storage system field and balance car field etc. emerging recently.
Therefore, they require also more and more higher to the serviceability of lithium ion battery and useful life.The traditional conductivity of positive pole batching in order to increase positive pole, that conductive agent adopts is SuperP, KS-6 or the two combine with certain proportion, no matter be single or the two combination, conductive agent is all be embedded in the gap of two active material particles with graininess, electrically conducting manner is with point-to-point conduction, and in order to ensure conductive effect, there is a lot of conductive agent guarantee conductive effect in gap to need the very large ratio of interpolation that two active material particles are shown in, so both reduce battery volume energy density, also the risk that the conductive agent increased is reunited, point-to-point electrically conducting manner requires that slurry dispersiveness will be got well simultaneously, otherwise battery easily occurs that consistency is poor, disperse bad battery cycle life also poor.
Summary of the invention
For above-mentioned deficiency, the object of the invention is, provides a kind of conductive effect good, has good heat conductivility, and can improve the high temperature performance of battery, extends the extended-life lithium ion battery slurry of the cycle life of battery.
The object of the invention is also, provides a kind of preparation method of above-mentioned extended-life lithium ion battery slurry.
For achieving the above object, technical scheme provided by the present invention is: a kind of extended-life lithium ion battery slurry, and it comprises anode sizing agent and cathode size, and described anode sizing agent is made up of the component of following mass percent:
Cobalt acid lithium 95.7 ~ 96.7%;
Kynoar 1.6 ~ 1.8%;
Carbon nano-tube 1.2 ~ 1.5%;
SuperP0.5～1.0%；
Said components is dissolved in 1-METHYLPYRROLIDONE, obtains the anode sizing agent that solid content is 62% ~ 65%;
Described cathode size is made up of the component of following mass percent:
Graphite 93.8 ~ 95.4%;
Sodium carboxymethylcellulose 1.4 ~ 1.6%;
Butadiene-styrene rubber 2.2 ~ 2.6%;
SuperP1.0～2.0%；
Said components is dissolved in deionized water, obtains the cathode size that solid content is 42% ~ 45%.
A preparation method for above-mentioned extended-life lithium ion battery slurry, it comprises the following steps:
(1) anode sizing agent is made:
(1.1) 1-METHYLPYRROLIDONE of 14 ~ 19 times of weight of Kynoar and Kynoar weight is added in a mixing bowl stir;
(1.2), after end to be mixed, SuperP is added in a mixing bowl and stirs;
(1.3), after end to be mixed, CNTs solution scattered is in advance added in a mixing bowl and stirs; CNTs solid content wherein in this CNTs solution is 4 ~ 6%;
(1.4), after end to be mixed, cobalt acid lithium is added in a mixing bowl and stirs;
(1.5), after end to be mixed, remaining 1-METHYLPYRROLIDONE is added in a mixing bowl and stirs;
(1.6) after end to be mixed, filter, obtain anode sizing agent;
(2) cathode size is made:
(2.1) deionized water of 47 ~ 49 times of weight of sodium carboxymethylcellulose and sodium carboxymethylcellulose weight is added in a mixing bowl;
(2.2), after end to be mixed, SuperP is added in a mixing bowl and stirs;
(2.3), after end to be mixed, graphite is added in a mixing bowl and stirs;
(2.4), after end to be mixed, butadiene-styrene rubber solution scattered is in advance added in a mixing bowl and stirs; Butadiene-styrene rubber solid content wherein in this butadiene-styrene rubber solution is 47 ~ 49%;
(2.5), after end to be mixed, remaining deionized water is added in a mixing bowl and stirs;
(2.6) after end to be mixed, filter, obtain cathode size;
Described step (1), (2) are without sequencing.
As a modification of the present invention, the mixing speed revolution 15 ~ 25Hz of described step (1.1); Rotation 1500 ~ 3000Hz, whipping temp 40 ± 10 DEG C, mixing time 3 ~ 4h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
Mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of described step (1.2), whipping temp 40 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085Mpa.
Mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of described step (1.3), whipping temp 40 ± 10 DEG C, mixing time 1 ~ 3h, vacuum degree≤-0.085Mpa;
Mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of described step (1.4), whipping temp 40 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085Mpa;
Mixing speed revolution 10 ~ 15Hz, the rotation 800 ~ 1500Hz of described step (1.5), mixing time 20 ~ 40min, vacuum degree≤-0.085Mpa.
Described step (1.6) adopts 150 ~ 200 object filter screens to filter, and repeats filtration twice.
As a modification of the present invention, the mixing speed revolution 20 ~ 25Hz of described step (2.1); Rotation 1500 ~ 3000Hz, whipping temp 30 ± 10 DEG C, mixing time 3 ~ 4h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
The mixing speed revolution 20 ~ 25Hz of described step (2.2); Rotation 1500 ~ 3000Hz, whipping temp 30 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h.
The mixing speed revolution 20 ~ 25Hz of described step (2.3); Rotation 1500 ~ 2500Hz, whipping temp 30 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
The mixing speed revolution 10 ~ 15Hz of described step (2.4); Rotation 800 ~ 1200Hz, whipping temp 30 ± 10 DEG C, mixing time 1 ~ 2h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h.
The mixing speed revolution 8 ~ 12Hz of described step (2.5); Rotation 700 ~ 1000Hz, whipping temp 30 ± 10 DEG C, mixing time 20 ~ 40min, vacuum degree≤-0.085MPa.
Described step (2.6) adopts 150 ~ 200 object filter screens to filter, and repeats filtration twice.
As a modification of the present invention, it is further comprising the steps of:
(3) be coated with: be coated on respectively by positive and negative electrode slurry in aluminium foil and copper foil current collector, correspondingly make positive plate and negative plate, the coating density of wherein said positive plate is 31.0 ~ 32.0mg/cm
2, the coating density of described negative plate is 14.48 ~ 14.95mg/cm
2;
(4) pole piece baking: carry out vacuum bakeout to positive and negative plate, removes moisture;
(5) roll-in: carry out roll-in with roll squeezer to positive and negative plate after baking, wherein the compacted density of positive plate is 3.55 ~ 3.65g/cm
3, the compacted density 1.45 ~ 1.50g/cm of negative plate
3;
(6) winding encapsulation: separated by positive and negative plate barrier film, and reel successively, then with aluminum plastic film encapsulation, obtains naked battery core;
(7) vacuum bakeout: vacuum bakeout 16 ~ 30h is carried out to naked battery core, baking temperature is 80 ~ 85 DEG C, every 2h in bake process, adopts the ventilation of nitrogen drying gas to discharge moisture;
(8) fluid injection: carry out fluid injection to cooled naked battery core, then vacuum seal leaves standstill 20 ~ 24h, makes positive and negative plate and the abundant Electolyte-absorptive of barrier film.
Beneficial effect of the present invention is: cell size formula provided by the invention is reasonable, SuperP and CNTs is adopted to combine with certain proportion, wherein SuperP is as point, CNTs is as line, in positive plate, SuperP is embedded into the gap of two active material particles, and CNTs covers the surface of active material particle as a chain, point combines with line and constitutes a conductive network, heighten the conductive effect of battery, ensure that consistency, CNTs also has electric double layer effect simultaneously, play the high-rate characteristics of ultracapacitor, its good heat conductivility also helps heat radiation during battery charging and discharging, reduce the polarization of battery, improve the high temperature performance of battery, extend the cycle life of battery, good combination property.Preparation method provided by the invention can make extended-life lithium ion battery pulp product fast, and processing step is succinct, and be easy to realize, productivity ratio is high.
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Accompanying drawing explanation
Fig. 1 is cycle life characteristics curve chart of the present invention.
Embodiment
Embodiment 1: present embodiments provide a kind of extended-life lithium ion battery slurry, it comprises anode sizing agent and cathode size, and described anode sizing agent is made up of the component of following mass percent: cobalt acid lithium 95.7%; Kynoar 1.8%; Carbon nano-tube 1.5%; SuperP1.0%;
Said components is dissolved in 1-METHYLPYRROLIDONE, obtains the anode sizing agent that solid content is 62% ~ 65%;
Described cathode size is made up of the component of following mass percent: graphite 93.8%; Sodium carboxymethylcellulose 1.6%; Butadiene-styrene rubber 2.6%; SuperP2.0%;
Said components is dissolved in deionized water, obtains the cathode size that solid content is 42% ~ 45%.
A preparation method for above-mentioned extended-life lithium ion battery slurry, it comprises the following steps:
(1) anode sizing agent is made:
(1.1) 1-METHYLPYRROLIDONE of 14 ~ 19 times of weight of Kynoar and Kynoar weight is added in a mixing bowl stir; Concrete, the mixing speed revolution 15 ~ 25Hz of this step (1.1); Rotation 1500 ~ 3000Hz, whipping temp 40 ± 10 DEG C, mixing time 3 ~ 4h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
(1.2), after end to be mixed, SuperP is added in a mixing bowl and stirs; Concrete, mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of this step (1.2), whipping temp 40 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085Mpa.
(1.3), after end to be mixed, CNTs solution scattered is in advance added in a mixing bowl and stirs; CNTs adopts dispersion liquid to carry out mixing dispersion, and obtain CNTs solution, dispersion liquid can be polyvinylpyrrolidone.CNTs solid content wherein in this CNTs solution is 4 ~ 6%; This CNTs solid content is preferably 5%; Concrete, mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of this step (1.3), whipping temp 40 ± 10 DEG C, mixing time 1 ~ 3h, vacuum degree≤-0.085Mpa;
(1.4), after end to be mixed, cobalt acid lithium is added in a mixing bowl and stirs; Concrete, mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of this step (1.4), whipping temp 40 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085Mpa;
(1.5), after end to be mixed, remaining 1-METHYLPYRROLIDONE is added in a mixing bowl and stirs; Concrete, mixing speed revolution 10 ~ 15Hz, the rotation 800 ~ 1500Hz of this step (1.5), mixing time 20 ~ 40min, vacuum degree≤-0.085Mpa.
(1.6) after end to be mixed, filter, obtain anode sizing agent; Concrete, this step (1.6) adopts 150 ~ 200 object filter screens to filter, and repeats filtration twice.
(2) cathode size is made:
(2.1) deionized water of 47 ~ 49 times of weight of sodium carboxymethylcellulose and sodium carboxymethylcellulose weight is added in a mixing bowl; Concrete, the mixing speed revolution 20 ~ 25Hz of this step (2.1); Rotation 1500 ~ 3000Hz, whipping temp 30 ± 10 DEG C, mixing time 3 ~ 4h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
(2.2), after end to be mixed, SuperP is added in a mixing bowl and stirs; Concrete, the mixing speed revolution 20 ~ 25Hz of step (2.2); Rotation 1500 ~ 3000Hz, whipping temp 30 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h.
(2.3), after end to be mixed, graphite is added in a mixing bowl and stirs; Concrete, the mixing speed revolution 20 ~ 25Hz of this step (2.3); Rotation 1500 ~ 2500Hz, whipping temp 30 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
(2.4), after end to be mixed, butadiene-styrene rubber solution scattered is in advance added in a mixing bowl and stirs;
Butadiene-styrene rubber adopts and directly adopts water to carry out mixing dispersion, and obtain butadiene-styrene rubber solution, the butadiene-styrene rubber solid content wherein in this butadiene-styrene rubber solution is 47 ~ 49%, and preferably, this butadiene-styrene rubber solid content is preferably 48%; Concrete, the mixing speed revolution 10 ~ 15Hz of step (2.4); Rotation 800 ~ 1200Hz, whipping temp 30 ± 10 DEG C, mixing time 1 ~ 2h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h.
(2.5), after end to be mixed, remaining deionized water is added in a mixing bowl and stirs; Concrete, the mixing speed revolution 8 ~ 12Hz of this step (2.5); Rotation 700 ~ 1000Hz, whipping temp 30 ± 10 DEG C, mixing time 20 ~ 40min, vacuum degree≤-0.085MPa.
(2.6) after end to be mixed, filter, obtain cathode size; Concrete, this step (2.6) adopts 150 ~ 200 object filter screens to filter, and repeats filtration twice.
Described step (1), (2) are without sequencing.
(3) be coated with: be coated on respectively by positive and negative electrode slurry in aluminium foil and copper foil current collector, correspondingly make positive plate and negative plate, the coating density of wherein said positive plate is 31.0 ~ 32.0mg/cm
2, the coating density of described negative plate is 14.48 ~ 14.95mg/cm
2;
(4) pole piece baking: carry out vacuum bakeout to positive and negative plate, removes moisture;
(5) roll-in: carry out roll-in with roll squeezer to positive and negative plate after baking, wherein the compacted density of positive plate is 3.55 ~ 3.65g/cm
3, the compacted density 1.45 ~ 1.50g/cm of negative plate
3;
(6) winding encapsulation: separated by positive and negative plate barrier film, and reel successively, then with aluminum plastic film encapsulation, obtains naked battery core;
(7) vacuum bakeout: vacuum bakeout 16 ~ 30h is carried out to naked battery core, baking temperature is 80 ~ 85 DEG C, every 2h in bake process, adopts the ventilation of nitrogen drying gas to discharge moisture;
(8) fluid injection: carry out fluid injection to cooled naked battery core, then vacuum seal leaves standstill 20 ~ 24h, makes positive and negative plate and the abundant Electolyte-absorptive of barrier film.
Embodiment 2, present embodiments provide a kind of extended-life lithium ion battery slurry and preparation method thereof, it is substantially the same manner as Example 1, and difference is, it is different with the component of cathode size that it comprises anode sizing agent.
Wherein anode sizing agent is made up of the component of following mass percent: cobalt acid lithium 96.7%; Kynoar 1.6%; Carbon nano-tube 1.2%; SuperP0.5%;
Described cathode size is made up of the component of following mass percent: graphite 95.4%; Sodium carboxymethylcellulose 1.4%; Butadiene-styrene rubber 2.2%; SuperP1%;
Embodiment 3, present embodiments provide a kind of extended-life lithium ion battery slurry and preparation method thereof, it is substantially the same manner as Example 1, and difference is, it is different with the component of cathode size that it comprises anode sizing agent.
Wherein anode sizing agent is made up of the component of following mass percent: cobalt acid lithium 96%; Kynoar 1.7%; Carbon nano-tube 1.4%; SuperP0.9%;
Described cathode size is made up of the component of following mass percent: graphite 95%; Sodium carboxymethylcellulose 1.5%; Butadiene-styrene rubber 2.4%; SuperP1.1%;
Embodiment 4, present embodiments provide a kind of extended-life lithium ion battery slurry and preparation method thereof, it is substantially the same manner as Example 1, and difference is, it is different with the component of cathode size that it comprises anode sizing agent.
Wherein anode sizing agent is made up of the component of following mass percent: cobalt acid lithium 96.2%; Kynoar 1.7%; Carbon nano-tube 1.3%; SuperP0.8%;
Described cathode size is made up of the component of following mass percent: graphite 94.5%; Sodium carboxymethylcellulose 1.5%; Butadiene-styrene rubber 2.5%; SuperP1.5%;
Above-described embodiment is only the good execution mode of the present invention, and the present invention can not enumerate out whole execution modes, the technical scheme of one of all employing above-described embodiments, or according to the equivalent variations that above-described embodiment does, all in scope.
Cell size formula provided by the invention is reasonable, SuperP and CNTs is adopted to combine with certain proportion, wherein SuperP is as point, CNTs is as line, in positive plate, SuperP is embedded into the gap of two active material particles, and CNTs covers the surface of active material particle as a chain, point combines with line and constitutes a conductive network, heighten the conductive effect of battery, ensure that consistency, CNTs also has electric double layer effect simultaneously, play the high-rate characteristics of ultracapacitor, its good heat conductivility also helps heat radiation during battery charging and discharging, reduce the polarization of battery, improve the high temperature performance of battery, extend the cycle life of battery, good combination property.
Adopt the battery core that technical scheme provided by the invention is obtained, 1C charge and discharge cycles 500 weeks, capability retention 90.16%, its cycle life characteristics is see Fig. 1.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also change above-mentioned execution mode and revise.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection range of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.As described in the above embodiment the present invention, method same or similar with it and component is adopted and other slurry obtained and method, all in scope.
Claims (10)
1. an extended-life lithium ion battery slurry, is characterized in that, it comprises anode sizing agent and cathode size, and described anode sizing agent is made up of the component of following mass percent:
Cobalt acid lithium 95.7 ~ 96.7%;
Kynoar 1.6 ~ 1.8%;
Carbon nano-tube 1.2 ~ 1.5%;
SuperP0.5～1.0%；
Said components is dissolved in 1-METHYLPYRROLIDONE, obtains the anode sizing agent that solid content is 62% ~ 65%;
Described cathode size is made up of the component of following mass percent:
Graphite 93.8 ~ 95.4%;
Sodium carboxymethylcellulose 1.4 ~ 1.6%;
Butadiene-styrene rubber 2.2 ~ 2.6%;
SuperP1.0～2.0%；
Said components is dissolved in deionized water, obtains the cathode size that solid content is 42% ~ 45%.
2. a preparation method for extended-life lithium ion battery slurry according to claim 1, it is characterized in that, it comprises the following steps:
(1) anode sizing agent is made:
(1.1) 1-METHYLPYRROLIDONE of 14 ~ 19 times of weight of Kynoar and Kynoar weight is added in a mixing bowl stir;
(1.2), after end to be mixed, SuperP is added in a mixing bowl and stirs;
(1.3), after end to be mixed, CNTs solution scattered is in advance added in a mixing bowl and stirs; CNTs solid content wherein in this CNTs solution is 4 ~ 6%;
(1.4), after end to be mixed, cobalt acid lithium is added in a mixing bowl and stirs;
(1.5), after end to be mixed, remaining 1-METHYLPYRROLIDONE is added in a mixing bowl and stirs;
(1.6) after end to be mixed, filter, obtain anode sizing agent;
(2) cathode size is made:
(2.1) deionized water of 47 ~ 49 times of weight of sodium carboxymethylcellulose and sodium carboxymethylcellulose weight is added in a mixing bowl;
(2.2), after end to be mixed, SuperP is added in a mixing bowl and stirs;
(2.3), after end to be mixed, graphite is added in a mixing bowl and stirs;
(2.4), after end to be mixed, butadiene-styrene rubber solution scattered is in advance added in a mixing bowl and stirs; Butadiene-styrene rubber solid content wherein in this butadiene-styrene rubber solution is 47 ~ 49%;
(2.5), after end to be mixed, remaining deionized water is added in a mixing bowl and stirs;
(2.6) after end to be mixed, filter, obtain cathode size;
Described step (1), (2) are without sequencing.
3. preparation method according to claim 2, is characterized in that, the mixing speed revolution 15 ~ 25Hz of described step (1.1); Rotation 1500 ~ 3000Hz, whipping temp 40 ± 10 DEG C, mixing time 3 ~ 4h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
Mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of described step (1.2), whipping temp 40 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085Mpa.
4. preparation method according to claim 2, is characterized in that, mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of described step (1.3), whipping temp 40 ± 10 DEG C, mixing time 1 ~ 3h, vacuum degree≤-0.085Mpa;
Mixing speed revolution 20 ~ 30Hz, the rotation 2000 ~ 3000Hz of described step (1.4), whipping temp 40 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085Mpa;
Mixing speed revolution 10 ~ 15Hz, the rotation 800 ~ 1500Hz of described step (1.5), mixing time 20 ~ 40min, vacuum degree≤-0.085Mpa.
5. preparation method according to claim 2, is characterized in that, described step (1.6) adopts 150 ~ 200 object filter screens to filter, and repeats filtration twice.
6. preparation method according to claim 2, is characterized in that, the mixing speed revolution 20 ~ 25Hz of described step (2.1); Rotation 1500 ~ 3000Hz, whipping temp 30 ± 10 DEG C, mixing time 3 ~ 4h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
The mixing speed revolution 20 ~ 25Hz of described step (2.2); Rotation 1500 ~ 3000Hz, whipping temp 30 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h.
7. preparation method according to claim 2, is characterized in that, the mixing speed revolution 20 ~ 25Hz of described step (2.3); Rotation 1500 ~ 2500Hz, whipping temp 30 ± 10 DEG C, mixing time 2 ~ 3h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h;
The mixing speed revolution 10 ~ 15Hz of described step (2.4); Rotation 800 ~ 1200Hz, whipping temp 30 ± 10 DEG C, mixing time 1 ~ 2h, vacuum degree≤-0.085MPa, end final vacuum to be mixed leaves standstill 2 ~ 4h.
8. preparation method according to claim 2, is characterized in that, the mixing speed revolution 8 ~ 12Hz of described step (2.5); Rotation 700 ~ 1000Hz, whipping temp 30 ± 10 DEG C, mixing time 20 ~ 40min, vacuum degree≤-0.085MPa.
9. preparation method according to claim 2, is characterized in that, described step (2.6) adopts 150 ~ 200 object filter screens to filter, and repeats filtration twice.
10. preparation method according to claim 2, is characterized in that, it is further comprising the steps of:
(3) be coated with: be coated on respectively by positive and negative electrode slurry in aluminium foil and copper foil current collector, correspondingly make positive plate and negative plate, the coating density of wherein said positive plate is 31.0 ~ 32.0mg/cm
2, the coating density of described negative plate is 14.48 ~ 14.95mg/cm
2;
(4) pole piece baking: carry out vacuum bakeout to positive and negative plate, removes moisture;
(5) roll-in: carry out roll-in with roll squeezer to positive and negative plate after baking, wherein the compacted density of positive plate is 3.55 ~ 3.65g/cm
3, the compacted density 1.45 ~ 1.50g/cm of negative plate
3;
(6) winding encapsulation: separated by positive and negative plate barrier film, and reel successively, then with aluminum plastic film encapsulation, obtains naked battery core;
(7) vacuum bakeout: vacuum bakeout 16 ~ 30h is carried out to naked battery core, baking temperature is 80 ~ 85 DEG C, every 2h in bake process, adopts the ventilation of nitrogen drying gas to discharge moisture;
(8) fluid injection: carry out fluid injection to cooled naked battery core, then vacuum seal leaves standstill 20 ~ 24h, makes positive and negative plate and the abundant Electolyte-absorptive of barrier film.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105529430A (en) * | 2015-11-20 | 2016-04-27 | 河北银隆新能源有限公司 | Preparation method of nano lithium titanate anode slurry |
| CN108539121A (en) * | 2018-04-16 | 2018-09-14 | 江西迪芯能源科技有限公司 | A kind of lithium ion battery anode slurry and lithium ion battery |
| CN108832181A (en) * | 2018-05-30 | 2018-11-16 | 河南新太行电源股份有限公司 | A kind of preparation process of lithium ion low temperature battery |
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