CN104659332A - High-magnification lithium iron phosphate battery positive electrode and manufacturing method thereof - Google Patents
High-magnification lithium iron phosphate battery positive electrode and manufacturing method thereof Download PDFInfo
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- CN104659332A CN104659332A CN201510089370.1A CN201510089370A CN104659332A CN 104659332 A CN104659332 A CN 104659332A CN 201510089370 A CN201510089370 A CN 201510089370A CN 104659332 A CN104659332 A CN 104659332A
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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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
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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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Abstract
The invention discloses a high-magnification lithium iron phosphate battery positive electrode. The high-magnification lithium iron phosphate battery positive electrode is characterized in that a current collector main body of the electrode is made from perforated foamed nickel with a three-dimensional conductive frame structure; the surface of the conductive frame of foamed nickel is coated with an electro-conductive protecting layer; the porosity of the foamed nickel is 50% to 98% and preferably 85% to 95%; the perforation rate of the foamed nickel is larger than 98%; the protecting layer is a pvdf or polyacrylic acid conductive coating which contains 5% to 95% of conductive particles; the conductive particles are one of conductive carbon black, graphite and aluminum powder of which the particle size is smaller than 5 micrometers.
Description
Technical field
The present invention relates to field of lithium ion battery, particularly relate to a kind of high rate lithium iron phosphate cell positive pole and manufacture method thereof.
Technical background
Along with market is for the improving constantly of performance requirement of lithium ion battery, current most of lithium battery manufacturing firm is all by adding more conductive agent and thinner electrode coating thickness manufactures high-multiplying-power battery electrode in electrode coating, especially for the LiFePO 4 material of low conductivity, very thin LiFePO4 coating layer thickness makes the volume of electrode current collecting body take than greatly increasing, and reduces the loading of active material thus reduces the whole volume of battery.Because electrochemical reaction is originally as the three-dimensional mass transport process of one, the paper tinsel class of and current use known by basic electrochemistry general knowledge is as compared with Copper Foil, aluminium foil, adopt metal foam as the collector of lithium ion battery, significantly improve capacity and the multiplying power discharging property of lithium ion battery.Owing to there is the three-dimensional pore space of porous in foam metal, active material can be made to be filled in this hole, instead of its surface can only be coated in as paper tinsel body collector.And in the porous three-dimensional pore space that active material is filled in foam metal after, not only increase filling rate, and be more conducive to being uniformly distributed with electrolyte permeability, being uniformly distributed of current density due to the three dimensional pore structures of foam metal itself and porous, thus the active material utilization of lithium ion battery can be improved, improve capacity and the multiplying power discharging property of lithium ion battery.On the contrary, for metal foil, active material can only be distributed in the surface of collector.The electric energy changing into chemical energy mainly passes to active material by collector, active material near collector and the active material away from collector widely different point mixing of electric energy, the closer to collector, it is also more even while that its electric energy distributed being more, more away from collector, its electric energy distributed is fewer.Can find out that the metal foil adopted due to affluxion body in lithium ion batteries result in the input and output of lithium ion battery active material and the inhomogeneities of energy in conversion process, have influence on the raising of active material utilization.The general aluminium of lithium battery anode collector, making three-dimensional conductive collector needs through-hole foam aluminum, shown in CN200610154100 patent.And not yet realize commercialization for the foamed aluminium material of battery, the foam metal of large-scale commercial has foam copper and nickel foam, the oxidizing potential of copper very low being not suitable for does plus plate current-collecting body, and the theoretical oxidation current potential of nickel is about 3.8V, close to the deboost 3.65V of LiFePO4, but due to the irrational state of nickel surface in practical application, cause its oxidizing potential to reduce, so pure foam nickel be not applied in commercial LiFePO4 system lithium battery.
Summary of the invention
The object of this invention is to provide a kind of effectively reduce electrode active material and collector contact internal resistance, improve high rate lithium iron phosphate cell positive pole and the manufacture method thereof of the combination property of electrode.
For achieving the above object, the technical solution used in the present invention is:
A kind of high rate lithium iron phosphate cell positive pole, is characterized in that: the collector main body of electrode is the through-hole foam nickel with three-dimensional conductive skeleton structure, and nickel foam conducting matrix grain surface-coated have can the protective layer of electron conduction.
Described collector main body is the nickel foam with three-dimensional conductive skeleton structure, and the porosity of nickel foam is 50 ~ 98%, preferably 85% ~ 95%, and through-hole rate is greater than 98%.
Described protective layer is contain the pvdf of 5% ~ 95% conducting particles or polyacrylic conductive coating; Conducting particles is the one that particle diameter is less than in the conductive black of 5um, graphite and aluminium powder.
Comprise the following steps obtained: by containing 5% ~ 95% high-purity aluminium powder of D50<5um and the pvdf powder of 5% ~ 95% stir after join in NMP or diethyl ether solution and fully mix, be coated on the through-hole foam nickel of porosity 50% ~ 98% by vertical slurry technique, and by continuous tunnel furnace preliminarily dried at 90 ~ 110 DEG C; Nickel foam after coating is placed in vacuum drying chamber vacuumize shelve with 150 DEG C ~ 250 DEG C temperature, conductive protection coating is fully combined with through-hole foam nickel; With conventional pulping way, LiFePO4, conductive agent and aqueous binders are made electrode slurry again, be coated on the nickel foam collector of above-mentioned process by slurry technique equally, after vacuumizing drying, use continuous twin rollers pair roller to design thickness again.
Comprise the following steps obtained: aqueous adhesive is fully dissolved and is scattered in deionized water, add the conductive black of the D50=5um of the solid content of 5% ~ 95% again, abundant mix and blend, be coated on the through-hole foam nickel of porosity 50 ~ 98% by vertical slurry technique, and by continuous tunnel furnace preliminarily dried at 50 ~ 120 DEG C; Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 90 ~ 120 DEG C of temperature and shelve, conductive protection coating is fully combined with nickel foam; With conventional pulping way current in industry, LiFePO4, conductive agent and oiliness binding agent pvdf are made electrode slurry again, same slurry technique is coated on the nickel foam collector of above-mentioned process, uses continuous twin rollers pair roller to design thickness after vacuumizing drying again.
Described conductive agent selects one or more in super_P, acetylene black and electrically conductive graphite, and aqueous binders selects one or more in la135, CMC and SBR.
The preparation method of high rate lithium iron phosphate cell positive pole, it is characterized in that: comprise the following steps: add nmp solution after the high-purity aluminium powder of D50=5um and the pvdf powder of 10% that contain 90% being stirred with dry method and fully mix to viscosity 400cp, be coated on by vertical slurry technique on the through-hole foam nickel of the 25ppi of the suitable thickness of porosity about 95%, and by continuous tunnel furnace preliminarily dried at 110 DEG C; Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 200 DEG C of temperature and shelve 8h, conductive protection coating is fully combined with nickel foam; Again by the LiFePO4 of 91%, the conductive black of 3%, the electrically conductive graphite of 1% and 5% the abundant stirring and adjusting of LA133 binding agent deionized water to conventional viscosity, namely electrode slurry is made with convention stir pulping way, same slurry technique is coated on the nickel foam collector of above-mentioned process, dry more than 8h at vacuumizing 120 DEG C after 80 DEG C of preliminarily drieds, then use continuous twin rollers pair roller to design thickness.
La135 bonding agent is scattered in the deionized water of 90% design flow, add the conductive black of the D50=5um of the solid content of 90%, abundant mix and blend also adds deionized water and is about 250cp to viscosity, be coated on by vertical slurry technique on the through-hole foam nickel of the 25ppi of the suitable thickness of porosity about 95%, and by continuous tunnel furnace preliminarily dried at 80 DEG C; Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 120 DEG C of temperature and shelve 8h, conductive protection coating is fully combined with nickel foam; Again by the LiFePO4 of 91%, the conductive black of 3%, the electrically conductive graphite of 1% and 5% the abundant stirring and adjusting of pvdf binding agent NMP to specifying viscosity, namely electrode slurry is made with convention stir pulping way, same slurry technique is coated on the nickel foam collector of above-mentioned process, dry more than 8h at vacuumizing 120 DEG C after 110 DEG C of preliminarily drieds, then use continuous twin rollers pair roller to design thickness.
For making nickel foam become possibility for iron phosphate lithium positive pole collector, the present invention has drawn following solution by lot of experiments.The theoretical oxidation current potential being summarized known nickel by above-mentioned technical background is about 3.8V, close to the deboost 3.65V of LiFePO4, but due to the irrational state of nickel surface in practical application, its oxidizing potential is caused to reduce, so pure foam nickel be not applied in commercial LiFePO4 system lithium battery.Owing to have employed conductive protection coating nickel coating skeleton surface in the present invention; isolate the etch of electrolyte to the imperfect clean state of nickel surface on the one hand; simultaneously due to bonding agent in protective finish and battery positive electrode active material compatibility better; what effectively reduce electrode active material and collector contacts internal resistance, improves the combination property of electrode.So a protective finish of good performance is the key factor that foam nickel electrode is applied.And how to make conductive protecting layer and nickel foam corrupt split be firmly an importance of the present invention.Because in Production Process of Lithium Battery, the dispersant of positive pole LiFePO4 is divided into two kinds usually, a kind of is take NMP as the oleaginous system of representative, and representational bonding agent has pvdf etc.; Another kind is water-based system, and be namely dispersant with water, representing bonding agent is polyacrylate, as La135 etc.; Above-mentioned bonding agent all can completely cut off the contact of collector and battery electrolyte solvent, thus protects collector conducting matrix grain.In a preferred embodiment of the invention, namely nickel foam adopts above-mentioned bonding agent by conducting particles and nickel foam compound, forms the conductive protecting layer isolated with electrolyte solvent, further provides three-dimensional conductive skeleton simultaneously.The mode of above-mentioned bonding agent and nickel foam compound can select slurry technique current in industry or spraying coating process, preferred slurry technique.The compound of nickel foam and LiFePO 4 material also can adopt above-mentioned two kinds of techniques (slurry and spraying).The dispersant of conductive protection coating and LiFePO 4 material should be avoided selecting same type, because this may cause the problem of being dissolved in follow-up LiFePO 4 material compound tense conductive protection coating and destroying.The composition of certain conductive protection coating and manufacturing process are including but not limited to above-mentioned processing mode.Above-mentioned explanation just better sets forth technical key point of the present invention; anyly add protective layer on nickel foam surface and the way being applied to iron phosphate lithium positive pole system all belongs to the content of the present invention's protection, describe innovation of the present invention in detail below in conjunction with concrete case study on implementation.
Accompanying drawing explanation
Fig. 1 is the high rate performance figure containing high magnification iron phosphate lithium positive pole battery
Fig. 2 is the cycle performance figure containing high magnification iron phosphate lithium positive pole battery.
Embodiment
The present invention and result of implementation is specifically introduced below with nonrestrictive execution mode.
Example 1, by containing 90% high-purity aluminium powder of D50=5um and the pvdf powder of 10% stir with dry method after add nmp solution several times and fully mix to viscosity and be about 400cp, be coated on by vertical slurry technique on the through-hole foam nickel of the 25ppi of the suitable thickness of porosity about 95%, and by continuous tunnel furnace preliminarily dried at 110 DEG C.Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 200 DEG C of temperature and shelve about 8h, conductive protection coating is fully combined with nickel foam.Again by the LiFePO4 of 91%, 3% conductive black, 1% electrically conductive graphite and 5% the abundant stirring and adjusting of proportioning deionized water of LA133 binding agent to conventional viscosity, namely electrode slurry is made with convention stir pulping way, same slurry technique is coated on the nickel foam collector of above-mentioned process, dry more than 8h at vacuumizing 120 DEG C after 80 DEG C of preliminarily drieds, then use continuous twin rollers pair roller to design thickness.
Example 2, La135 bonding agent is scattered in the deionized water of 90% design flow, add the conductive black of the D50=5um of the solid content of 90% several times, abundant mix and blend also adds deionized water and is about 250cp to viscosity, be coated on by vertical slurry technique on the through-hole foam nickel of the 25ppi of the suitable thickness of porosity about 95%, and by continuous tunnel furnace preliminarily dried at 80 DEG C.Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 120 DEG C of temperature and shelve about 8h, conductive protection coating is fully combined with nickel foam.Again by the LiFePO4 of 91%, 3% conductive black, 1% electrically conductive graphite and 5% the abundant stirring and adjusting of proportioning NMP of pvdf binding agent to conventional viscosity, namely electrode slurry is made with convention stir pulping way, same slurry technique is coated on the nickel foam collector of above-mentioned process, dry more than 8h at vacuumizing 120 DEG C after 110 DEG C of preliminarily drieds, then use continuous twin rollers pair roller to design thickness.
1220 button cells are assembled into by die-cut for the electrode of said method manufacture; the high rate performance recorded and cycle performance as shown below; can see that 3C electric discharge can reach 87% of rated capacity; even if with the multiplying power discharging of 10C; the capacity of battery still can reach 78% of rated capacity; discharge curve is comparatively mild simultaneously; demonstrate the multiplying power property that three-diemsnional electrode is excellent; the capability retention after 500 times that circulates reaches 97.4%; only decay 2.6%; foam nickel electrode after visible conductive protective film is coated has good stability, demonstrates excellent using value.
Embodiment recited above is only be described the preferred embodiment of the present invention; not design of the present invention and protection range are limited; under the prerequisite not departing from design concept of the present invention; the various modification that in this area, common engineers and technicians make technical scheme of the present invention and improvement, all should fall into protection scope of the present invention.
Claims (8)
1. a high rate lithium iron phosphate cell positive pole, is characterized in that: the collector main body of electrode is the through-hole foam nickel with three-dimensional conductive skeleton structure, and nickel foam conducting matrix grain surface-coated have can the protective layer of electron conduction.
2. a kind of high rate lithium iron phosphate cell positive pole according to claim 1, it is characterized in that: described collector main body is the nickel foam with three-dimensional conductive skeleton structure, the porosity of nickel foam is 50 ~ 98%, preferably 85% ~ 95%, and through-hole rate is greater than 98%.
3. a kind of high rate lithium iron phosphate cell positive pole according to claim 1, is characterized in that: described protective layer is contain the pvdf of 5% ~ 95% conducting particles or polyacrylic conductive coating; Conducting particles is the one that particle diameter is less than in the conductive black of 5um, graphite and aluminium powder.
4. a kind of high rate lithium iron phosphate cell positive pole according to claim 1, it is characterized in that, comprise the following steps obtained: by containing 5% ~ 95% high-purity aluminium powder of D50<5um and the pvdf powder of 5% ~ 95% stir after join in NMP or diethyl ether solution and fully mix, be coated on the through-hole foam nickel of porosity 50% ~ 98% by vertical slurry technique, and by continuous tunnel furnace preliminarily dried at 90 ~ 110 DEG C; Nickel foam after coating is placed in vacuum drying chamber vacuumize shelve with 150 DEG C ~ 250 DEG C temperature, conductive protection coating is fully combined with through-hole foam nickel; With conventional pulping way, LiFePO4, conductive agent and aqueous binders are made electrode slurry again, be coated on the nickel foam collector of above-mentioned process by slurry technique equally, after vacuumizing drying, use continuous twin rollers pair roller to design thickness again.
5. a kind of high rate lithium iron phosphate cell positive pole according to claim 1, it is characterized in that, comprise the following steps obtained: aqueous adhesive is fully dissolved and is scattered in deionized water, add the conductive black of the D50=5um of the solid content of 5% ~ 95% again, abundant mix and blend, be coated on the through-hole foam nickel of porosity 50 ~ 98% by vertical slurry technique, and by continuous tunnel furnace preliminarily dried at 50 ~ 120 DEG C; Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 90 ~ 120 DEG C of temperature and shelve, conductive protection coating is fully combined with nickel foam; With conventional pulping way current in industry, LiFePO4, conductive agent and oiliness binding agent pvdf are made electrode slurry again, same slurry technique is coated on the nickel foam collector of above-mentioned process, uses continuous twin rollers pair roller to design thickness after vacuumizing drying again.
6. a kind of high rate lithium iron phosphate cell positive pole according to claim 4 and 5, it is characterized in that: described conductive agent selects one or more in super_P, acetylene black and electrically conductive graphite, and aqueous binders selects one or more in la135, CMC and SBR.
7. the preparation method of a high rate lithium iron phosphate cell positive pole as claimed in claim 1, it is characterized in that: comprise the following steps: add nmp solution after the high-purity aluminium powder of D50=5um and the pvdf powder of 10% that contain 90% being stirred with dry method and fully mix to viscosity 400cp, be coated on by vertical slurry technique on the through-hole foam nickel of the 25ppi of the suitable thickness of porosity about 95%, and by continuous tunnel furnace preliminarily dried at 110 DEG C; Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 200 DEG C of temperature and shelve 8h, conductive protection coating is fully combined with nickel foam; Again by the LiFePO4 of 91%, the conductive black of 3%, the electrically conductive graphite of 1% and 5% the abundant stirring and adjusting of LA133 binding agent deionized water to conventional viscosity, namely electrode slurry is made with convention stir pulping way, same slurry technique is coated on the nickel foam collector of above-mentioned process, dry more than 8h at vacuumizing 120 DEG C after 80 DEG C of preliminarily drieds, then use continuous twin rollers pair roller to design thickness.
8. the preparation method of high rate lithium iron phosphate cell positive pole according to claim 7, it is characterized in that: La135 bonding agent is scattered in the deionized water of 90% design flow, add the conductive black of the D50=5um of the solid content of 90%, abundant mix and blend also adds deionized water and is about 250cp to viscosity, be coated on by vertical slurry technique on the through-hole foam nickel of the 25ppi of the suitable thickness of porosity about 95%, and by continuous tunnel furnace preliminarily dried at 80 DEG C; Nickel foam after coating is placed in vacuum drying chamber to vacuumize with 120 DEG C of temperature and shelve 8h, conductive protection coating is fully combined with nickel foam; Again by the LiFePO4 of 91%, the conductive black of 3%, the electrically conductive graphite of 1% and 5% the abundant stirring and adjusting of pvdf binding agent NMP to specifying viscosity, namely electrode slurry is made with convention stir pulping way, same slurry technique is coated on the nickel foam collector of above-mentioned process, dry more than 8h at vacuumizing 120 DEG C after 110 DEG C of preliminarily drieds, then use continuous twin rollers pair roller to design thickness.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909434A (en) * | 2015-06-02 | 2015-09-16 | 吉林大学 | Manufacturing method of lithium iron phosphate three-dimensional electrode |
| CN106025341A (en) * | 2016-06-27 | 2016-10-12 | 国润金华（北京）国际投资管理有限公司 | Lithium-ion power battery capable of being quickly charged and discharged and long in service life |
| CN107960137A (en) * | 2015-06-04 | 2018-04-24 | 由普莱克斯有限公司 | Solid state battery and its manufacturing process |
| CN108390041A (en) * | 2018-02-28 | 2018-08-10 | 石河子大学 | Foamed nickel current collector LiFePO4/graphene composite material electrode slice and preparation method thereof |
| CN108511681A (en) * | 2017-12-11 | 2018-09-07 | 吉安市优特利科技有限公司 | Electrode slice and preparation method thereof and battery |
| CN108808001A (en) * | 2018-06-11 | 2018-11-13 | 四会市恒星智能科技有限公司 | A kind of multiple elements design conductive layer and preparation method thereof |
| CN112310406A (en) * | 2020-10-29 | 2021-02-02 | 欣旺达电动汽车电池有限公司 | Flexible current collector and preparation method thereof, pole piece and battery |
| CN112928239A (en) * | 2021-03-31 | 2021-06-08 | 神华准能资源综合开发有限公司 | Preparation method of foam material molded lithium iron phosphate electrode and battery |
| US11791496B2 (en) | 2018-12-27 | 2023-10-17 | Industrial Technology Research Institute | Metal-ion battery |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909434A (en) * | 2015-06-02 | 2015-09-16 | 吉林大学 | Manufacturing method of lithium iron phosphate three-dimensional electrode |
| CN107960137A (en) * | 2015-06-04 | 2018-04-24 | 由普莱克斯有限公司 | Solid state battery and its manufacturing process |
| CN106025341A (en) * | 2016-06-27 | 2016-10-12 | 国润金华（北京）国际投资管理有限公司 | Lithium-ion power battery capable of being quickly charged and discharged and long in service life |
| CN108511681A (en) * | 2017-12-11 | 2018-09-07 | 吉安市优特利科技有限公司 | Electrode slice and preparation method thereof and battery |
| CN108511681B (en) * | 2017-12-11 | 2024-04-09 | 吉安市优特利科技有限公司 | Electrode plate, preparation method thereof and battery |
| CN108390041A (en) * | 2018-02-28 | 2018-08-10 | 石河子大学 | Foamed nickel current collector LiFePO4/graphene composite material electrode slice and preparation method thereof |
| CN108808001A (en) * | 2018-06-11 | 2018-11-13 | 四会市恒星智能科技有限公司 | A kind of multiple elements design conductive layer and preparation method thereof |
| US11791496B2 (en) | 2018-12-27 | 2023-10-17 | Industrial Technology Research Institute | Metal-ion battery |
| CN112310406A (en) * | 2020-10-29 | 2021-02-02 | 欣旺达电动汽车电池有限公司 | Flexible current collector and preparation method thereof, pole piece and battery |
| CN112928239A (en) * | 2021-03-31 | 2021-06-08 | 神华准能资源综合开发有限公司 | Preparation method of foam material molded lithium iron phosphate electrode and battery |
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| Publication number | Publication date |
|---|---|
| CN104659332B (en) | 2017-01-11 |
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