CN107749450B - Preparation method of high-safety lithium ion battery diaphragm - Google Patents
Preparation method of high-safety lithium ion battery diaphragm Download PDFInfo
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- CN107749450B CN107749450B CN201610910449.0A CN201610910449A CN107749450B CN 107749450 B CN107749450 B CN 107749450B CN 201610910449 A CN201610910449 A CN 201610910449A CN 107749450 B CN107749450 B CN 107749450B
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- ion battery
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/403—Manufacturing processes of separators, membranes or diaphragms
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- 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 a preparation method of a high-safety lithium ion battery diaphragm, which comprises the steps of surface treatment of hollow rubber microspheres, coating of a base material, stretching and pore-forming treatment, extraction treatment and the like. When the temperature in the lithium ion battery rises abnormally due to faults, the hollow rubber microspheres expand to fill gaps on the original diaphragm and prevent ions in electrolyte on two sides of the diaphragm from migrating, so that the temperature in the lithium ion battery is reduced, and the safety of the lithium ion battery is ensured; after the temperature is reduced, the hollow rubber microspheres shrink and return to the original state; the lithium ion battery diaphragm has higher thermal stability and mechanical strength, and does not generate thermal shrinkage phenomenon even after the internal temperature of the lithium ion battery is overhigh, so that the contact of a positive electrode and a negative electrode can be avoided.
Description
Technical Field
The invention relates to the technical field of lithium ion battery diaphragm manufacturing, in particular to a preparation method of a high-safety lithium ion battery diaphragm.
Background
In recent years, rapid development in the fields of portable electronic products, electric vehicles, energy storage power stations, and the like has made higher demands on energy storage technologies. Lithium ion batteries are the first choice in these fields due to their high energy density, and their energy density is also increasing. Along with the increasing energy density of lithium ion batteries, the safety problem faced by lithium ion batteries is becoming more and more severe, and the end use of high energy density lithium ion batteries has been severely limited. The safety problem of lithium ion batteries is mainly due to thermal runaway of the battery. The temperature inside the battery is continuously raised due to abnormal heat generation reaction inside the battery, and then more heat generation side reactions are caused, so that the battery is ignited and even explodes, and the life and property safety of a user is seriously threatened.
To ameliorate this problem, various strategies have been employed to improve the safety characteristics of lithium ion batteries. At present, the thermal stability of the diaphragm is mainly improved through the ceramic coating, and the contact between a positive electrode and a negative electrode caused by thermal contraction of the diaphragm is avoided, so that the thermal runaway reaction is slowed down. For example, Chinese patent publication No. CN104269509A, patent publication No. 2015, 1 month and 7 days, discloses a ceramic coating diaphragm for a lithium battery and a preparation method thereof, wherein the ceramic coating diaphragm comprises a ceramic coating layer and a substrate diaphragm, the ceramic coating layer is prepared by uniformly coating aqueous ceramic coating slurry on the surface of the substrate diaphragm, the ceramic coating slurry comprises 10-30 wt% of alumina, 0.5-3 wt% of adhesive, 0.2-1.0 wt% of additive and 0.01-0.1 wt% of auxiliary agent, and the alumina is nano alumina powder with the grain diameter ratio D1/D2 of 0.10-0.20; the ceramic coating diaphragm of the technical scheme of the invention has improved thermal safety and strong wetting capacity to electrolyte, and can prolong the cycle life of a battery when applied to a lithium battery; however, the ceramic-coated separator can only improve the thermal stability and strength of the separator, but cannot block heat-generating side reactions, so the improvement effect is limited, and the safety problem of the battery with the energy density not more than 200Wh/kg can only be solved at present, and the ceramic-coated separator cannot be widely used.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation method of a high-safety lithium ion battery diaphragm which has high mechanical strength and good tensile resistance and can cut off heat-generating side reactions when the temperature in a lithium battery is too high, and the high-safety lithium ion battery diaphragm prepared by the method can be restored after the temperature of the lithium battery is reduced.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a high-safety lithium ion battery diaphragm is characterized by comprising the following steps:
a) mixing and stirring the rubber microspheres and paraffin uniformly, wherein the weight of the paraffin is 10-50% of that of the rubber microspheres;
b) coating the rubber balls treated in the step a on two surfaces of a diaphragm base material, wherein the weight of the rubber balls is 10-30% of that of the diaphragm base material, and preparing a high-safety lithium ion battery diaphragm primary product;
c) stretching the high-safety lithium ion battery diaphragm primary product under the action of a bidirectional stretching force to form a hole;
d) adding the high-safety lithium ion battery diaphragm primary product processed by the steps into an extracting agent for extraction and cleaning;
e) and drying the high-safety lithium ion battery diaphragm primary product after extraction and cleaning treatment to obtain the high-safety lithium ion battery diaphragm.
Before the rubber microspheres are coated on the diaphragm base material, the surface of the rubber microspheres is coated with a layer of paraffin, so that the rubber microspheres can be easily formed into a film on the diaphragm base material, and can be easily combined with the diaphragm base material, but the existence of the paraffin can influence the performance of the diaphragm, such as the adhesion performance of electrolyte, and therefore the polymer needs to be removed by an extracting agent after being fixed; the bidirectional stretching treatment is that the gaps among the original rubber microspheres form pore channels with regular shapes, sizes and corresponding intervals to form an ion channel for the migration of electrolyte ions; the rubber microspheres with different contents are selected, so that the sizes and gaps of formed ion paths are different, and the lithium ion battery pack is suitable for different types of lithium ion batteries.
Preferably, the rubber microspheres are hollow rubber microspheres, air is filled in the hollow rubber microspheres, and the particle size of the hollow rubber microspheres is 50-5000 nanometers.
The method comprises the following steps of selecting hollow rubber microspheres with air inside to coat the surface of a diaphragm substrate, and expanding the air inside the hollow rubber microspheres and the hollow rubber microspheres to fill gaps between the original diaphragm and the hollow rubber microspheres and prevent ions in electrolyte on two sides of the diaphragm from migrating after the temperature inside the lithium ion battery rises abnormally due to failure, so that the temperature inside the lithium ion battery is reduced, and the safety of the lithium ion battery is ensured; meanwhile, after the temperature is reduced, the air inside the hollow rubber microspheres shrinks, the hollow rubber microspheres shrink and return to the original state, and the porosity of the hollow rubber microspheres can at least reach more than 98% of the porosity of the original diaphragm after the hollow rubber microspheres shrink and return.
Preferably, the rubber microspheres are one of cis-polyisoprene rubber microspheres, isoprene rubber microspheres, styrene-butadiene rubber microspheres, chloroprene rubber microspheres, nitrile rubber microspheres, fluororubber microspheres or polysulfide rubber microspheres.
The cis-polyisoprene rubber microspheres, the isoprene rubber microspheres, the styrene-butadiene rubber microspheres, the chloroprene rubber microspheres, the nitrile rubber microspheres, the fluororubber microspheres and the polysulfide rubber microspheres are all rubber microspheres with good elasticity, good tensile resistance and higher softening points, and the stable service temperature of the rubber microspheres is 100 ℃ or above. Particularly, the stable service temperature of the fluororubber microspheres can be up to 200 ℃ and above, and the fluororubber microspheres can be used for a long time even in an environment of 250 ℃, meanwhile, the fluororubber has excellent tensile resistance which reaches 3-4 kN/m, the temperature in the lithium ion battery can be increased, and when the air in the rubber microspheres is heated to expand, the hollow rubber microspheres are kept from being broken, so that the safety of the lithium ion battery is ensured; meanwhile, after the temperature is reduced, the air inside the hollow rubber microspheres shrinks, the hollow rubber microspheres shrink and return to the original state, and the porosity of the hollow rubber microspheres can almost reach the porosity of the original diaphragm after the hollow rubber microspheres shrink and return through detection.
Preferably, the diaphragm base material is a polyethylene film or a polypropylene film, and the thickness of the diaphragm base material is 20-30 micrometers.
Preferably, in the biaxial stretching treatment in step c, the longitudinal stretching amount is 6 to 9 times the transverse stretching amount.
Preferably, the extracting agent adopted in the step d is dichloromethane or acetone, and the passing speed of the lithium ion battery diaphragm primary product during extraction is 10-20 m/min.
The paraffin has better solubility in dichloromethane or acetone, and the influence of the dichloromethane and the acetone on polystyrene or polyvinylidene fluoride is small, so that dichloromethane or acetone is selected as an extracting agent to clean the high-safety lithium ion battery diaphragm initial product, and the influence on the rubber microspheres is avoided while the paraffin is removed.
Preferably, the porosity of the high-safety lithium ion battery separator is 20-60%.
Therefore, the invention has the following beneficial effects: according to the invention, the hollow rubber microspheres with air inside are coated on the surface of the diaphragm substrate, when the temperature inside the lithium ion battery rises abnormally due to failure, the air inside the hollow rubber microspheres expands, the hollow rubber microspheres expand to fill gaps on the original diaphragm and gaps between the hollow rubber microspheres, and the migration of ions in electrolyte on two sides of the diaphragm is prevented, so that the temperature inside the lithium ion battery is reduced, and the safety of the lithium ion battery is ensured; meanwhile, after the temperature is reduced, the air in the hollow rubber microspheres shrinks, and the hollow rubber microspheres shrink and return to the original state; the lithium ion battery diaphragm has higher thermal stability and mechanical strength, and does not generate thermal shrinkage phenomenon even after the internal temperature of the lithium ion battery is overhigh, so that the contact of a positive electrode and a negative electrode can be avoided.
Detailed Description
The technical solution of the present invention will be further described with reference to the following embodiments.
Comparative example
Preparing a positive pole piece: mixing 93.5 parts by weight of nickel cobalt lithium manganate (LiNi0.5Co0.2Mn0.3O2), 2 parts by weight of conductive carbon black, 1 part by weight of carbon nanotubes and 3.5 parts by weight of polyvinylidene fluoride, adding 70 parts by weight of N-N-dimethylpyrrolidone, stirring to form slurry, uniformly coating the slurry on a positive base fluid calendering aluminum foil, drying, and rolling by using a rolling machine to prepare a positive pole piece;
preparing a negative pole piece: mixing 95.2 parts by weight of artificial graphite (energy density: 335mAh/g), 1 part by weight of conductive carbon black, 1.3 parts by weight of sodium carboxymethylcellulose and 2.5 parts by weight of styrene butadiene rubber, adding 140 parts by weight of deionized water, stirring to form slurry, uniformly coating the slurry on a negative base fluid electrolytic copper foil with the thickness of 10 mu m, drying, and rolling by using a rolling machine to prepare a negative pole piece;
preparing a diaphragm: the diaphragm is a microporous polyethylene diaphragm with the thickness of 25 microns;
preparing an electrolyte: the electrolyte is dissolved into an organic solvent mixture of dimethyl carbonate, ethyl methyl carbonate, ethylene carbonate and propylene carbonate by adopting 1.3mol/L lithium hexafluorophosphate, wherein the volume ratio of the dimethyl carbonate, the ethyl methyl carbonate, the ethylene carbonate and the propylene carbonate is 42:52:3: 3;
preparing a shell: the shell adopts an aluminum-plastic film, and the aluminum-plastic film adopts a layer-by-layer composite structure material which is 152 microns thick and comprises a nylon layer, a bonding layer, a PP layer, a bonding layer, an aluminum foil, a bonding layer and PP;
preparing an external terminal: the positive terminal adopts a tab made of 0.2 mm thick aluminum, the negative terminal adopts a 0.2 mm copper nickel-plated tab, and the copper plating layer is 3 microns;
preparing a battery: alternately laminating the positive pole piece, the diaphragm and the negative pole piece in a lamination mode to form a battery core, and welding a pole lug in a one-way mode; then carrying out heat sealing on the aluminum plastic film, injecting electrolyte, and carrying out heat sealing; and sequentially carrying out standing, cold hot pressing, pre-charging, evacuating, formation and capacity grading to prepare the 20Ah lithium ion power battery, wherein the charge-discharge cut-off voltage of the battery is 2.7-4.2V.
Example 1
The same as comparative example except for the preparation method of the separator and the separator.
The preparation method of the high-safety lithium ion battery diaphragm comprises the following steps:
a) mixing cis-polyisoprene rubber microspheres, isoprene rubber microspheres and paraffin wax, and uniformly stirring, wherein the weight of the paraffin wax is 10% of that of the rubber pellets; the rubber microspheres are hollow rubber microspheres, air is filled in the hollow rubber microspheres, and the particle size of the hollow rubber microspheres is 50 nanometers;
b) coating the rubber balls treated in the step a on two surfaces of a diaphragm base material, wherein the weight of the rubber balls is 10% of that of the diaphragm base material, and preparing a high-safety lithium ion battery diaphragm primary product; a polyethylene film or a polypropylene film, the thickness of the diaphragm substrate being 20 microns;
c) stretching the high-safety lithium ion battery diaphragm primary product under the action of a bidirectional stretching force to form a hole; in the biaxial stretching treatment, the longitudinal stretching amount is 6 times of the transverse stretching amount;
d) adding the high-safety lithium ion battery diaphragm primary product processed by the steps into an extracting agent for extraction and cleaning; the extractant is dichloromethane or acetone, and the passing speed of the primary lithium ion battery diaphragm product during extraction is 10 m/min;
e) and drying the high-safety lithium ion battery diaphragm primary product after extraction and cleaning treatment to obtain the high-safety lithium ion battery diaphragm.
The high-safety lithium ion battery diaphragm prepared by the steps has the porosity of 20%.
Example 2
The same as in example 1 was repeated, except that the cis-polyisoprene rubber microspheres in example 1 were replaced with isoprene rubber microspheres.
Example 3
The same as comparative example except for the preparation method of the separator and the separator.
The preparation method of the high-safety lithium ion battery diaphragm comprises the following steps:
a) mixing and stirring the fluororubber microspheres and paraffin uniformly, wherein the weight of the paraffin is 25% of that of the rubber microspheres; the rubber microspheres are hollow rubber microspheres, air is filled in the hollow rubber microspheres, and the particle size of the hollow rubber microspheres is 1000 nanometers;
b) coating the rubber balls treated in the step a on two surfaces of a diaphragm base material, wherein the weight of the rubber balls is 20% of that of the diaphragm base material, and preparing a high-safety lithium ion battery diaphragm primary product; a polyethylene film or a polypropylene film, the thickness of the diaphragm substrate being 20 microns;
c) stretching the high-safety lithium ion battery diaphragm primary product under the action of a bidirectional stretching force to form a hole; in the biaxial stretching treatment, the longitudinal stretching amount is 7 times of the transverse stretching amount;
d) adding the high-safety lithium ion battery diaphragm primary product processed by the steps into an extracting agent for extraction and cleaning; the extractant is dichloromethane or acetone, and the passing speed of the primary lithium ion battery diaphragm product during extraction is 13 m/min;
e) and drying the high-safety lithium ion battery diaphragm primary product after extraction and cleaning treatment to obtain the high-safety lithium ion battery diaphragm.
The high-safety lithium ion battery diaphragm prepared by the steps has the porosity of 45%.
Example 4
The same as example 3 was repeated except that the fluororubber microspheres in example 3 were replaced with styrene-butadiene rubber microspheres.
Example 5
The same as comparative example except for the preparation method of the separator and the separator.
The preparation method of the high-safety lithium ion battery diaphragm comprises the following steps:
a) mixing and stirring the butadiene rubber microspheres and paraffin uniformly, wherein the weight of the paraffin is 35 percent of that of the rubber microspheres; the rubber microspheres are hollow rubber microspheres, air is filled in the hollow rubber microspheres, and the particle size of the hollow rubber microspheres is 2500 nanometers;
b) coating the rubber balls treated in the step a on two surfaces of a diaphragm base material, wherein the weight of the rubber balls is 22% of that of the diaphragm base material, and preparing a high-safety lithium ion battery diaphragm primary product; a polyethylene film or a polypropylene film, the thickness of the separator substrate being 25 microns;
c) stretching the high-safety lithium ion battery diaphragm primary product under the action of a bidirectional stretching force to form a hole; in the biaxial stretching treatment, the longitudinal stretching amount is 8 times of the transverse stretching amount;
d) adding the high-safety lithium ion battery diaphragm primary product processed by the steps into an extracting agent for extraction and cleaning; the extractant is dichloromethane or acetone, and the passing speed of the primary lithium ion battery diaphragm product during extraction is 16 m/min;
e) and drying the high-safety lithium ion battery diaphragm primary product after extraction and cleaning treatment to obtain the high-safety lithium ion battery diaphragm.
The high-safety lithium ion battery diaphragm prepared by the steps has the porosity of 40%.
Example 6
The same procedure as in example 5 was repeated, except that the polybutadiene rubber microspheres in example 5 were replaced with chloroprene rubber microspheres.
Example 7
The same as comparative example except for the preparation method of the separator and the separator.
The preparation method of the high-safety lithium ion battery diaphragm comprises the following steps:
a) mixing nitrile rubber microspheres or polysulfide rubber microspheres with paraffin wax, and stirring uniformly, wherein the weight of the paraffin wax is 50% of that of the rubber microspheres; the rubber microspheres are hollow rubber microspheres, air is filled in the hollow rubber microspheres, and the particle size of the hollow rubber microspheres is 5000 nanometers;
b) coating the rubber balls treated in the step a on two surfaces of a diaphragm base material, wherein the weight of the rubber balls is 30% of that of the diaphragm base material, and preparing a high-safety lithium ion battery diaphragm primary product; a polyethylene film or a polypropylene film, the thickness of the diaphragm substrate is 30 microns;
c) stretching the high-safety lithium ion battery diaphragm primary product under the action of a bidirectional stretching force to form a hole; in the biaxial stretching treatment, the longitudinal stretching amount is 9 times of the transverse stretching amount;
d) adding the high-safety lithium ion battery diaphragm primary product processed by the steps into an extracting agent for extraction and cleaning; the extractant is dichloromethane or acetone, and the passing speed of the primary lithium ion battery diaphragm product during extraction is 20 m/min;
e) and drying the high-safety lithium ion battery diaphragm primary product after extraction and cleaning treatment to obtain the high-safety lithium ion battery diaphragm.
The high-safety lithium ion battery diaphragm prepared by the steps has the porosity of 60%.
Example 8
The same procedure as in example 7 was repeated, except that the nitrile rubber microspheres in example 7 were replaced with the polysulfide rubber microspheres.
In the above examples, the same as comparative examples were carried out except for the production method of the separator and the separator.
And (3) performance effect detection:
the lithium ion batteries prepared in the comparative examples and the examples are respectively subjected to an overcharge test, a high-temperature test and a needling test; wherein the high temperature test is carried out by keeping the temperature at 150 ℃ for 30 minutes, and the needling test is carried out by adopting a 3mm steel nail; the test results are given in the following table:
tests show that the high-safety lithium ion battery diaphragm prepared by the technical scheme of the invention has the advantages of obviously improved safety, good safety performance and higher passing rate of overcharge tests, high-temperature tests and needling tests.
Claims (5)
1. A preparation method of a high-safety lithium ion battery diaphragm is characterized by comprising the following steps:
a) mixing and stirring the rubber microspheres and paraffin uniformly, wherein the weight of the paraffin is 10-50% of that of the rubber microspheres; the rubber microspheres are hollow rubber microspheres, air is filled in the hollow rubber microspheres, and the particle size of the hollow rubber microspheres is 50-5000 nanometers;
b) coating the rubber microspheres processed in the step a on two surfaces of a diaphragm base material, wherein the weight of the rubber microspheres is 10-30% of that of the diaphragm base material, and preparing a high-safety lithium ion battery diaphragm primary product;
c) stretching the high-safety lithium ion battery diaphragm primary product under the action of a bidirectional stretching force to form a hole;
d) adding the high-safety lithium ion battery diaphragm primary product processed by the steps into an extracting agent for extraction and cleaning; the extracting agent is dichloromethane or acetone, and the passing speed of the primary lithium ion battery diaphragm product during extraction is 10-20 m/min;
e) and drying the high-safety lithium ion battery diaphragm primary product after extraction and cleaning treatment to obtain the high-safety lithium ion battery diaphragm.
2. The preparation method of the high-safety lithium ion battery separator according to claim 1, characterized in that: the rubber microsphere is one of cis-polyisoprene rubber microsphere, isoprene rubber microsphere, styrene butadiene rubber microsphere, chloroprene rubber microsphere, nitrile butadiene rubber microsphere, fluororubber microsphere or polysulfide rubber microsphere.
3. The preparation method of the high-safety lithium ion battery separator according to claim 1, characterized in that: the diaphragm base material is a polyethylene film or a polypropylene film, and the thickness of the diaphragm base material is 20-30 micrometers.
4. The preparation method of the high-safety lithium ion battery separator according to claim 1, characterized in that: in the biaxial stretching treatment in the step c, the longitudinal stretching amount is 6-9 times of the transverse stretching amount.
5. The preparation method of the high-safety lithium ion battery separator according to claim 1, characterized in that: the high-safety lithium ion battery diaphragm has a porosity of 20-60%.
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| CN102687317A (en) * | 2009-11-20 | 2012-09-19 | 日产自动车株式会社 | Bipolar secondary battery current collector |
| WO2012158835A1 (en) * | 2011-05-16 | 2012-11-22 | Hauser Ray L | Cross-linked battery electrode separator |
| CN102820444A (en) * | 2011-06-10 | 2012-12-12 | 比亚迪股份有限公司 | Battery diaphragm and fabrication method thereof |
| CN104157811A (en) * | 2013-12-11 | 2014-11-19 | 中航锂电（洛阳）有限公司 | Lithium ion battery composite diaphragm and preparation method and application thereof |
| CN105958009A (en) * | 2016-07-18 | 2016-09-21 | 洛阳力容新能源科技有限公司 | High-safety lithium ion battery composite pole piece and preparation method therefor, and lithium ion battery |
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2016
- 2016-10-19 CN CN201610910449.0A patent/CN107749450B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102687317A (en) * | 2009-11-20 | 2012-09-19 | 日产自动车株式会社 | Bipolar secondary battery current collector |
| WO2012158835A1 (en) * | 2011-05-16 | 2012-11-22 | Hauser Ray L | Cross-linked battery electrode separator |
| CN102820444A (en) * | 2011-06-10 | 2012-12-12 | 比亚迪股份有限公司 | Battery diaphragm and fabrication method thereof |
| CN104157811A (en) * | 2013-12-11 | 2014-11-19 | 中航锂电（洛阳）有限公司 | Lithium ion battery composite diaphragm and preparation method and application thereof |
| CN105958009A (en) * | 2016-07-18 | 2016-09-21 | 洛阳力容新能源科技有限公司 | High-safety lithium ion battery composite pole piece and preparation method therefor, and lithium ion battery |
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Effective date of registration: 20211111 Address after: 311215 No. 855, Jianshe Second Road, economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: Wanxiang 123 Co., Ltd Address before: 311215 No. 855, Jianshe Second Road, economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee before: Wanxiang 123 Co., Ltd Patentee before: Wanxiang Group Co., Ltd |
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