CN108878957A - A kind of automatic shutoff type high safety secondary lithium-ion power battery and preparation method thereof - Google Patents
A kind of automatic shutoff type high safety secondary lithium-ion power battery and preparation method thereof Download PDFInfo
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- CN108878957A CN108878957A CN201810758552.7A CN201810758552A CN108878957A CN 108878957 A CN108878957 A CN 108878957A CN 201810758552 A CN201810758552 A CN 201810758552A CN 108878957 A CN108878957 A CN 108878957A
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
Abstract
The invention discloses a kind of automatic shutoff type high safety secondary lithium-ion power batteries and preparation method thereof, belong to lithium ion battery preparation technical field, including cathode, anode, diaphragm and containing the nonaqueous electrolytic solution of lithium salts, cathode conductive current collector surface is coated with including high molecular polymer binder, conductive agent coating；High molecular polymer binder includes, one of polymer such as polyvinylidene fluoride, polytetrafluoroethylene (PTFE), polyimides, polyacrylic resin or multiple combinations material are as binder, conductive agent material includes one of substances such as acetylene black, carbon black, Ketjen black, single-walled carbon nanotube, multi-walled carbon nanotube, carbon nano-fiber, crystalline flake graphite, graphene or multiple mixed materials as conductive agent, also, the mass ratio of polymer binder material and conductive agent material is 32:1~1:Between 1；Cathode current collector carries out the thickness of surface pre-coated processing between 0.5~20um using above-mentioned formula.Lithium ion battery safety performance of the present invention is good, has extended cycle life.
Description
Technical field
The present invention relates to lithium ion battery preparation technical field, in particular to a kind of automatic shutoff type high safety secondary lithium from
Sub- power battery and preparation method thereof.
Background technique
Lithium ion battery is developed rapidly in recent years because having many advantages, such as high-energy-density, memory-less effect.Especially
As lithium ion battery is gradually in the application in the fields such as EV pure electric automobile, low-speed electronic vehicle, the security performance of lithium ion battery
It is concerned all the time with cycle performance.Therefore, thermal runaway management of the power lithium-ion battery under abuse conditions and control
The emphasis always studied and paid close attention in the industry；Lithium ion battery generation thermal runaway is common, and steps are as follows：When battery core is short in generation
When road, instantaneous short circuit high current generates heat by anodic-cathodic, and anode SEI first starts when reaching certain temperature condition
Selfdecomposition heat release, with the accumulation of heat, the graphite anode and electrolyte for charging state carry out exothermic heat of reaction, while gathering heat again
So that battery core temperature increases, when battery core temperature increases to a certain extent, the cathode construction of Charging state collapses, while discharging trip
From high reaction activity oxygen atom, the oxygen atom of release is the same as in binder, conductive agent auxiliary material and the battery core in electrode material
Electrolyte etc. reacts, and abrupt release is largely hot, cells burst or explosion.Electricity is prevented in lithium ion battery at present
The security protection means that thermal runaway occurs for core are mainly the following:1, by the shutdown of diaphragm (Shutdown) function come tissue
Current flowing plays the risk for reducing thermal runaway, and the major defect of this method is the battery core after diaphragm carries out shutdown movement
Also it scraps, cannot be further continued for using and the diaphragm as used in current lithium ion battery is a kind of porous polyolefin therewith
Film, the mechanism of shutdown are mainly melted by polyethylene at 130 DEG C of temperature to play the role of cut-off current, lithium ion battery
Internal Temperature Distribution is usually non-uniform when short circuit occurs, therefore can have some areas and reach shutdown temperature, and portion
Point place cannot reach the appearance of the case where shutdown temperature, and thus entire battery core electric current cannot be truncated；2, pass through CID
(Current Interrupt Device) pressure relief safety valve carries out safeguard protection, when battery core is due to vigorous reaction or other forms
Reaction generate gas pressure reach CID fracture threshold values when, battery core CID fracture plays the role of protect battery core.This form
Protection with diaphragm turn off it is similar, protective effect generation after, battery core cannot be further continued for using, be irrecoverable type guarantor
Shield.
Summary of the invention
Invention is designed to provide a kind of automatic shutoff type high safety secondary lithium-ion power battery and preparation method thereof, peace
Electricity when battery core temperature increases to a certain extent when short circuit or other hot abuse situations occurs for Quan Hao, long service life, battery core
The resistance mutation formula of core rises, and blocks the further progress of electric current and reaction, when battery core temperature recovery room temperature, battery core
It can restore normal use, to solve the problems mentioned in the above background technology.
To achieve the above object, the present invention provides the following technical solutions：
A kind of automatic shutoff type high safety secondary lithium-ion power battery, including cathode, anode, diaphragm and contains the non-of lithium salts
Water electrolysis liquid, the cathode current collector surface, which is coated with, includes high molecular polymer binder, conductive agent coating；The cathode electricity
Pole surface, which is coated with, includes high molecular polymer binder, conductive agent coating.
Preferably, the cathode current collector is rolling aluminum foil or stainless steel foil.
Preferably, the mass ratio of the polymer binder material and the conductive agent material is 32：1~1：1；Foil table
Face applies the mixture coating of polymer binder material and conductive agent material with a thickness of 0.5 μm -20 μm.
Preferably, the mass ratio of the polymer binder material and the conductive agent material is 32：1~1：1；Cathode electricity
Pole surface applies the mixture coating of polymer binder material and conductive agent material with a thickness of 0.5 μm -20 μm.
Preferably, the mixture coating thickness of the polymer binder material and conductive agent material of the foil surface coating
It is 1 μm -10 μm.
Preferably, the mixture of polymer binder material coated by the cathode electrode surface and conductive agent material applies
Layer is with a thickness of 1 μm -10 μm.
Preferably, the polymer material is polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) (PTFE), polyimides
(PI), any combination of polyacrylic resin (PAA), the conduction agent material is acetylene black, carbon black, Ketjen black, single wall carbon are received
Any combination of mitron, multi-walled carbon nanotube, carbon nano-fiber, crystalline flake graphite, graphene.
The present invention provides another technical solution：A kind of preparation side of automatic shutoff type high safety secondary lithium-ion power battery
Cathode, anode used by method, including lithium ion battery and non-aqueous electrolytic solution preparation method, include the following steps：
Step 1：The preprocess method of cathode current collector：The mixture of macromolecule polymer material and conductive agent is applied
On cathode current collector foil；
Step 2：Coating method：Macromolecule polymer material and conductive agent are first dispersed in suitable organic solvent
In, the slurry with mobility is made, slurry solid content is 5wt%-55wt%, is then brushed by extrusion coating or intaglio process
Application mode is coated on cathode current collector foil；
Step 3：Cathode electrode surface processing method：The mixture of macromolecule polymer material and conductive agent is coated in
On cathode electrode；
Step 4：Coating method：Macromolecule polymer material and conductive agent are first dispersed in suitable organic solvent
In, the slurry with mobility is made, slurry solid content is 5wt%-55wt%, is then brushed by extrusion coating or intaglio process
Application mode is coated on the cathode electrode.
Compared with prior art, the beneficial effects of the invention are as follows：
Automatic shutoff type high safety secondary lithium-ion power battery of the invention and preparation method thereof, lithium prepared by the present invention from
Sub- battery the protection for carrying out automatic shutoff electric current early period of thermal runaway can occur in battery core, realize from the side of battery core internal protection
Formula, more conventional battery core safety protection function are compared, which can be after protective effect, and external influence factor excludes
Battery core self-recovery afterwards, rather than a defencive function of GPF (General Protection False function, enable protection after it is subsequent cannot be further continued for using；
Simultaneously because the liquid suction function of coating, can save more electrolyte inside battery core using the battery core after the coating, thus
Also improve the cycle performance of battery core.
Detailed description of the invention
Fig. 1 is that safety coatings of the invention block electric current principle schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
A kind of high security long-life secondary lithium battery includes cathode, anode, diaphragm and non-water power containing lithium salts
Liquid is solved, cathode current collector surface, which is coated with, includes high molecular polymer binder, conductive agent coating；Cathode electrode surface equally applies
It is covered with comprising high molecular polymer binder, conductive agent coating.
The mass ratio of polymer binder material and conductive agent material of the invention is 32:1~1:1, it is preferably in a proportion of 10:
1~3:1；Foil surface applies the mixture coating of polymer binder material and conductive agent material with a thickness of 0.5 μm -20 μm,
Preferred thickness is 2~10 μm.The mass ratio of Inventive polymers binder material and conductive agent material is 32:1~1:1, preferably
Ratio is 15:1~2:1；Cathode electrode surface applies the mixture coating thickness of polymer binder material and conductive agent material
It is 0.5 μm -20 μm, preferred thickness is 2~10 μm.
The preparation method of automatic shutoff type high safety secondary lithium-ion power battery of the invention, including lithium ion battery are adopted
Cathode, anode and non-aqueous electrolytic solution preparation method, the preprocess method of cathode current collector are, by high molecular polymer
The mixture of material and conductive agent is coated on cathode current collector foil；Coating method is, first by macromolecule polymer material with
Conductive agent is dispersed in suitable organic solvent, and the slurry with mobility is made, and slurry solid content is 5wt%-
Then 55wt% is coated on cathode current collector foil by extrusion coating or intaglio printing application pattern；Cathode electrode surface
Processing method is to apply the mixture of macromolecule polymer material and conductive agent on the cathode electrode；Coating method is first will
Macromolecule polymer material and conductive agent are dispersed in suitable organic solvent, and the slurry with mobility, slurry is made
Solid content is 5wt%-55wt%, then on the cathode electrode by extrusion coating or the coating of intaglio printing application pattern.
Workable cathode material includes but is not limited to lamellar compound, such as cobalt acid lithium (LiCoO2) and lithium nickelate
(LiNiO2), or by the compound of one or more Transition metal substituteds, such as：Lithium manganese oxide, chemical formula such as Li1+xMn2-xO4
(0≦x≦0.33),LiMnO3,LiMn2O3And LiMnO2；Lithium Cu oxide (Li2CuO2)；Barium oxide, such as LiV3O8,V2O5
And Cu2V2O7；Lithium nickel oxide in terms of nickel, chemical formula such as LiNi1-xMxO2(M=Co, Mn, Al, Cu, Fe, Mg, B or Ga,
Wherein 0.01≤x≤0.3)；Complex Li-Mn-oxide, chemical formula such as LiMn2-xMxO2(M=Co, Ni, Fe, Cr, Zn or Ta,
In 0.01≤x≤0.1) or Li2Mn3MO8(M=Fe, Co, Ni, Cu or Zn)；LiMn2O, part of Li is by alkaline-earth metal ions
It is replaced；Disulfide and Fe2(MoO4)3,LiFe3O4Deng.
Workable cathode material further includes but is not limited to olivine-type polyanionic compound, such as LiFePO 4
(LiFePO4) and cobalt phosphate lithium (LiCoPO4), or by the compound of one or more Transition metal substituteds, such as LiFe1-xMxPO4
(M=Co, Ni, Fe, Cr, Zn or Ta, wherein 0.01≤x≤0.1) etc..
Workable anode material can be made by following material：Such as ungraphitised carbon or graphitized carbon；Metal composite oxidation
Object, such as LixFe2O3(0≦x≦1)、LixWO2(0≤x≤1) and SnxMe1-xMe′yOz(Me:Mn, Fe, Pb or Ge；Me′:Al,B,
P, Si, I, II, group-III element or halogen in the periodic table of elements；0<x≦1；1≦y≦3；With 1≤z≤8)；Lithium metal；Lithium closes
Gold；Silicon-base alloy；Kamash alloy；Metal oxide, such as SnO, SnO2、PbO、PbO2、Pb2O3、Pb3O4、Sb2O3、Sb2O4、
Sb2O5、GeO、GeO2、Bi2O3、Bi2O4And Bi2O5；Conducting polymer, such as polyacetylene；And material of Li-Co-Ni base etc..
Workable non-aqueous electrolytic solution can be made by following aprotic organic solvent：As n-methyl-2-pyrrolidone,
Ethylene carbonate, methyl ethyl carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, gamma-butyrolacton,
1,2- dimethoxy-ethane, 2- methyltetrahydrofuran, dimethyl sulfoxide, 1,3- dioxolanes, formamide, dimethylformamide, two
Butyl oxide link, acetonitrile, nitromethane, methyl formate, methyl acetate, phosphotriester, trimethoxy-methane, dioxolane derivatives,
Sulfolane, methyl sulfolane, 1,3- dimethyl-2-imidazolinone, carbonic acid Asia lactone derivatives, tetrahydrofuran derivatives, ether, third
Sour methyl esters and ethyl propionate.
Cathode, anode and the non-aqueous electrolytic solution that each embodiment battery uses are identical as existing lithium ion battery, they
Preparation method it is also identical, therefore be not described in detail.Mainly introduce below each embodiment battery automatic shutoff safety coatings composition and
Preparation method.
Embodiment 1
The present embodiment cell cathode active material is nickle cobalt lithium manganate (LiNixCoyMnzO2), anode active material is graphite
Change carbon, electrolyte is the LiPF containing 1.05M6The ethylene carbonate and methyl ethyl carbonate (3 of solute:7, w/w) solution.
The automatic shutoff safety coatings of the present embodiment battery are in the coating of cathode current collector aluminium foil by the mixed of PVDF and acetylene black
Close object.In mixture, the weight ratio of PVDF and acetylene black is 20:1；Coating layer thickness is set as 2 μm.
It is prepared by the coating of the present embodiment battery：PVDF is first dissolved in nmp solvent, forming solid content is 10wt%)
Then acetylene black is evenly dispersed in PVDF glue by PVDF colloidal solution, the slurry with mobility is made, and adjusts viscosity number
In 500~1000CP.S, slurry solid content is set as 8wt%, cathode current collector is then coated on by way of extrusion coating
On foil, applied thickness 2um.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
It is shown in Table 1.
Embodiment 2
The present embodiment and the difference of embodiment 1 are only that, replace polyvinylidene fluoride (PVDF) with polyimides (PI).
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test knot are done to the present embodiment lithium ion secondary battery
Fruit is also shown in Table 1.
Embodiment 3
The present embodiment and the difference of embodiment 1 are only that, replace polyvinylidene fluoride with polyacrylic resin (PAA)
(PVDF), with the mixture replacing acetylene black of carbon black and multi-walled carbon nanotube.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also it is shown in Table 1.
Comparative example 1
Cathode current collector used is positive normal conventional products, is not coated by the mixture containing any polymer and conductive agent, cathode,
The materials such as anode and electrolyte and production method are all same as Example 1.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also it is shown in Table 1.
Table 1
As seen from Table 1, under the same conditions, battery (embodiment 1 to embodiment 3) of the present invention, service life and safety
Performance is significantly improved.
Embodiment 4
The present embodiment cell cathode active material is LiFePO4 (LiFePO4), anode active material is artificial graphite, electricity
Solution liquid is the LiPF containing 1.05M6The ethylene carbonate and methyl ethyl carbonate (3 of solute:7, w/w) solution.
The automatic shutoff safety coatings of the present embodiment battery be cathode current collector aluminium foil and cathode shaped electrode coating by
The mixture of PVDF and acetylene black.In mixture, the weight ratio of PVDF and acetylene black is 9:1；Coating layer thickness is set as 2 μm.
It is prepared by the coating of the present embodiment battery：PVDF is first dissolved in nmp solvent, forming solid content is 10wt%)
Then acetylene black is evenly dispersed in PVDF glue by PVDF colloidal solution, the slurry with mobility is made, and adjusts viscosity number
In 500~1000CP.S, slurry solid content is set as 8wt%, is then respectively applied by way of extrusion coating in cathode collection
On fluid foil and cathode electrode surface, applied thickness is 2um.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
It is shown in Table 2.
Embodiment 5
The present embodiment and the difference of embodiment 4 are only that, replace polyvinylidene fluoride with polyacrylic resin (PAA)
(PVDF), with the mixture replacing acetylene black of carbon black and multi-walled carbon nanotube.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also 2 are shown in Table.
Embodiment 6
The present embodiment and the difference of embodiment 4 are only that, with mixing for polyimides (PI) and polyvinylidene fluoride (PVDF)
It closes object and replaces polyvinylidene fluoride (PVDF), with the mixture replacing acetylene black of carbon black and multi-walled carbon nanotube.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also 2 are shown in Table.
Embodiment 7
The present embodiment and the difference of embodiment 4 are only that, with mixing for polyimides (PI) and polyvinylidene fluoride (PVDF)
It closes object and replaces polyvinylidene fluoride (PVDF), with the mixture replacing acetylene black of acetylene black and single-walled carbon nanotube.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also 2 are shown in Table.
Embodiment 8
The present embodiment and the difference of embodiment 4 are only that, with polyacrylic resin (PAA) and polyvinylidene fluoride (PVDF)
Mixture replace polyvinylidene fluoride (PVDF) will be applied with the mixture replacing acetylene black of acetylene black and single-walled carbon nanotube
The ratio of polymer and conductive agent is adjusted to 10 in layer:1；
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also 2 are shown in Table.
Comparative example 2
Cathode current collector used is positive normal conventional products, is not coated by the mixture containing any polymer and conductive agent, cathode,
The materials such as anode and electrolyte and production method are all same as Example 4.
Loop test, 50 DEG C of high temperature short circuit experiments, needle thorn experiment, test result are done to the present embodiment lithium ion secondary battery
Also 2 are shown in Table.
Table 2
As seen from Table 2, under the same conditions, battery (embodiment 4 to embodiment 8) of the present invention, service life and safety
Performance is significantly improved.
The principle of the invention lies in when circuit works normally, battery core temperature is close with room temperature, automatic shutoff safety coatings
Resistance very little will not hinder electric current to pass through in cell circuit；And when overcurrent occurs in circuit because failure, since fever is led
The rising of core temperature is sent a telegraph, when temperature is more than certain temperature (Ts is shown in Fig. 1), the resistance moment of automatic shutoff safety coatings can become
It is very big, the current limit in circuit to very low level.After artificially cutting circuit debugging, the resistance value meeting of safety coatings
It is promptly restored to original level, after fault excludes, battery core restores normal use.
In conclusion automatic shutoff type high safety secondary lithium-ion power battery proposed by the present invention and preparation method thereof, this
The lithium ion battery of invention is when short circuit occurs for battery core or battery core temperature increases to a certain extent when other hot abuse situations
The resistance mutation formula of battery core rises, and blocks the further progress of electric current and reaction, when battery core temperature recovery room temperature, electricity
Core can restore normal use, the protection for carrying out automatic shutoff electric current early period of thermal runaway can occur in battery core, realize from battery core
The mode of internal protection, more conventional battery core safety protection function are compared, which can be extraneous after protective effect
Battery core self-recovery after influence factor excludes, a rather than defencive function of GPF (General Protection False function, after enabling protection it is subsequent not
Can be further continued for using；Simultaneously because the liquid suction function of coating, can save more electrolyte using the battery core after the coating and exist
Inside battery core, to also improve the cycle performance of battery core.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of automatic shutoff type high safety secondary lithium-ion power battery, including cathode, anode, diaphragm and contains the non-aqueous of lithium salts
Electrolyte, which is characterized in that the cathode current collector surface, which is coated with, includes high molecular polymer binder, conductive agent coating；
The cathode electrode surface, which is coated with, includes high molecular polymer binder, conductive agent coating.
2. a kind of automatic shutoff type high safety secondary lithium-ion power battery according to claim 1, which is characterized in that described
Cathode current collector is rolling aluminum foil or stainless steel foil.
3. a kind of automatic shutoff type high safety secondary lithium-ion power battery according to claim 1, which is characterized in that described
The mass ratio of polymer binder material and the conductive agent material is 32：1~1：1；Foil surface applies polymeric binder
The mixture coating of material and conductive agent material is with a thickness of 0.5 μm -20 μm.
4. a kind of automatic shutoff type high safety secondary lithium-ion power battery according to claim 1, which is characterized in that described
The mass ratio of polymer binder material and the conductive agent material is 32：1~1：1；It is viscous that cathode electrode surface applies polymer
The mixture coating of agent material and conductive agent material is tied with a thickness of 0.5 μm -20 μm.
5. a kind of automatic shutoff type high safety secondary lithium-ion power battery according to claim 3, which is characterized in that described
The mixture coating of the polymer binder material of foil surface coating and conductive agent material is with a thickness of 1 μm -10 μm.
6. a kind of automatic shutoff type high safety secondary lithium-ion power battery according to claim 4, which is characterized in that described
The mixture coating of polymer binder material coated by cathode electrode surface and conductive agent material is with a thickness of 1 μm -10 μm.
7. a kind of automatic shutoff type high safety secondary lithium-ion power battery according to claim 3, which is characterized in that described
Polymer material is polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) (PTFE), polyimides (PI), polyacrylic resin
(PAA) any combination, it is described conduction agent material be acetylene black, carbon black, Ketjen black, single-walled carbon nanotube, multi-walled carbon nanotube,
Any combination of carbon nano-fiber, crystalline flake graphite, graphene.
8. a kind of preparation side of automatic shutoff type high safety secondary lithium-ion power battery according to claim 1-7
Cathode, anode used by method, including lithium ion battery and non-aqueous electrolytic solution preparation method, which is characterized in that including such as
Lower step：
Step 1：The preprocess method of cathode current collector：By the mixture of macromolecule polymer material and conductive agent coated in yin
On the collector foil of pole；
Step 2：Coating method：First macromolecule polymer material and conductive agent are dispersed in suitable organic solvent, made
At the slurry with mobility, slurry solid content is 5wt%-55wt%, then passes through extrusion coating or intaglio printing coating side
Formula is coated on cathode current collector foil；
Step 3：Cathode electrode surface processing method：The mixture of macromolecule polymer material and conductive agent is coated in cathode
On electrode；
Step 4：Coating method：First macromolecule polymer material and conductive agent are dispersed in suitable organic solvent, made
At the slurry with mobility, slurry solid content is 5wt%-55wt%, then passes through extrusion coating or intaglio printing coating side
Formula is coated on the cathode electrode.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112038572A (en) * | 2019-06-03 | 2020-12-04 | 安徽盟维新能源科技有限公司 | Composite binder, electrode plate and manufacturing method thereof |
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Application publication date: 20181123 |