CN106935901A - Lithium ion battery and its cathode sheet - Google Patents
Lithium ion battery and its cathode sheet Download PDFInfo
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- CN106935901A CN106935901A CN201511034021.6A CN201511034021A CN106935901A CN 106935901 A CN106935901 A CN 106935901A CN 201511034021 A CN201511034021 A CN 201511034021A CN 106935901 A CN106935901 A CN 106935901A
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- lithium ion
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- ion battery
- cathode sheet
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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
- 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
-
- 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
- H01M4/621—Binders
- H01M4/622—Binders being polymers
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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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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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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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a kind of lithium ion battery and its cathode sheet for using.The cathode sheet includes cathode current collector, the conductive bond coating being coated on cathode current collector and the negative electrode diaphragm being coated on conductive bond coating, and active material of cathode is included in negative electrode diaphragm；The conductive bond coating includes conductive agent and two kinds of binding agents, and wherein the first binding agent is polymethyl methacrylate, and second binding agent is the high polymer containing one or more polar groups in imide ring, carboxyl, acid anhydrides.Compared with prior art, conductive bond coating in cathode sheet of the present invention can respectively produce stronger cementability with cathode current collector, negative electrode diaphragm, on cathode current collector, battery security in use is effectively guaranteed so as to by negative electrode diaphragm strong bond.
Description
Technical field
The invention belongs to technical field of lithium ion, it is more particularly related to a kind of lithium-ion electric
Pond and its cathode sheet.
Background technology
The negative electrode diaphragm of existing lithium ion battery generally by active material (such as nickel-cobalt-manganese ternary material NCM),
Conductive agent mixes composition with binding agent (such as PVDF).Because the active material on cathode sheet itself is harder,
Crisp, the bonding force between aluminum foil current collector is relatively low, and interface resistance is larger, is unfavorable for lithium ion battery
The performance of dynamic performance, and during big multiplying power charge and discharge and long circulating, easily cause active material
Material comes off, and causes lithium ion battery to fail, or even has the danger such as short-circuit, on fire, it is difficult to meet the long circulating longevity
The demand of life.Improve the bonding force of active material on cathode sheet, it is necessary to increase the consumption of binding agent,
Although do so can to a certain extent improve the bonding firmness of active material, the dynamic of battery can be brought
A series of problems, such as mechanical property is deteriorated, effective active material content is reduced, and bonding firmness is carried
It is high also very limited.
In view of this, it is necessory to provide a kind of active material bonding firmness lithium ion battery cathode higher
Pole piece.
The content of the invention
It is an object of the invention to：There is provided a kind of active material of cathode firm lithium-ion electric Nian Jie with collector
Pool cathode pole piece and the lithium ion battery using the cathode sheet, to reduce cell interface resistance, and ensure electricity
Pond security in use.
In order to realize foregoing invention purpose, present inventor is by further investigation, there is provided a kind of lithium from
Sub- cell cathode pole piece, it include cathode current collector, the conductive bond coating being coated on cathode current collector and
The negative electrode diaphragm on conductive bond coating is coated on, active material of cathode is included in negative electrode diaphragm；The conduction
Bonding coat includes conductive agent and two kinds of binding agents, and wherein the first binding agent is polymethyl methacrylate
(PMMA), second binding agent is to contain one or more polar groups in imide ring, carboxyl, acid anhydrides
High polymer.
Compared with prior art, the present invention introduces conductive bond coating in lithium ion battery cathode sheet,
The polar group of binding agent can produce part hydrogen bond with cathode current collector aluminium foil in conductive bond coating, while
PMMA has similar cohesive energy and good compatibility to the binding agent PVDF in negative electrode diaphragm, thus
Conductive bond coating can respectively produce stronger cementability with cathode current collector, negative electrode diaphragm, so as to by the moon
Pole diaphragm strong bond is effectively guaranteed battery security in use on cathode current collector.
Preferably, second binding agent is polyimides, polybismaleimide, polyacrylic acid, poly-
One or more in acrylonitrile.
Preferably, described the first binding agent and second mass ratio of binding agent are (0.85~1.33):1.
Under this conditions of mixture ratios, can simultaneously ensure that conductive bond coating is respectively provided with well with cathode current collector, negative electrode diaphragm
Cementability.
Preferably, the conductive agent in the conductive bond coating can be conductive carbon black, acetylene black, Ketjen black,
One or more of the conductive carbon materials such as CNT, Graphene.
Preferably, in the conductive bond coating, the weight content of binding agent is 65-75wt%, conductive agent
Weight content is 25-35wt%.
Preferably, the coating thickness of the conductive bond coating is 1-10 μm.
Preferably, conductive agent and binding agent are also included in the negative electrode diaphragm, binding agent contains PVDF.
Preferably, the cathode current collector is aluminium foil.
Preferably, the lithium ion battery cathode sheet is by cathode current collector, conductive bond coating and cathodic coating
Piece is constituted.
In order to realize foregoing invention purpose, present invention also offers a kind of lithium ion battery, it includes negative electrode pole
Piece, anode pole piece, electrolyte and the barrier film being interval between anode and cathode pole piece, the cathode sheet is
Lithium ion battery cathode sheet described in any of the above-described paragraph.
Compared with prior art, after lithium ion battery of the present invention uses conductive bond coating, the electrochemistry of battery
There is no obvious deterioration in performance, security is but significantly improved.
Brief description of the drawings
Below in conjunction with the accompanying drawings and specific embodiment, to lithium ion battery of the present invention, cathode sheet and its beneficial effect
Fruit is described in detail.
Fig. 1 is the interlayer structure schematic diagram of lithium ion battery cathode sheet of the present invention.
Specific embodiment
In order that goal of the invention of the invention, technical scheme and Advantageous Effects become apparent from, below in conjunction with
Embodiment and accompanying drawing describe in further detail the present invention.It is to be understood that embodiments of the invention
Just for the sake of explaining the present invention, the limitation present invention is not intended to, and embodiments of the invention are not limited to
The embodiment be given in specification.The routinely condition of unreceipted experiment condition makes in embodiment, or by material
The condition that material supplier recommends makes.
Fig. 1 is referred to, lithium ion battery cathode sheet of the present invention includes cathode current collector 10, is coated on negative electrode
Conductive bond coating 12 and the negative electrode diaphragm 14 being coated on conductive bond coating 12 on collector 10.It is cloudy
Pole collector 10 is preferably aluminium foil；Conductive bond coating 12 includes conductive agent and two kinds of binding agents, wherein
The first binding agent is PMMA, second binding agent be containing a kind of in imide ring, carboxyl, acid anhydrides or
The high polymer of several polar groups.Negative electrode diaphragm 14 be cathode active material, comprising active material of cathode,
Conductive agent and binding agent, contain PVDF in binding agent.Although it can be readily appreciated that being illustrated that in Fig. 1
The two-sided of cathode current collector 10 has been coated with conductive bond coating 12 and negative electrode diaphragm 14, but actually used
When, the cathode sheet of part specific position can also single coating conductive bond coating 12 and negative electrode diaphragm 14.
After conductive bond coating 12 is applied to the surface of cathode current collector 10, wrapped in second binding agent
The hydroxyl exposed with aluminium foil surface is formed a large amount of hydrogen bonds by imide ring and/or carboxyl for containing etc., so as to by conduction
The strong bond of bonding coat 12 is on cathode current collector 10；And the first binding agent PMMA because with cathodic coating
PVDF in piece 14 has close cohesive energy and good compatibility, and produces stronger phase with PVDF
Interaction, makes conductive bond coating 10 have very strong adhesive effect with negative electrode diaphragm 14.Therefore, increase newly
Conductive bond coating 12 can increase substantially bonding force between negative electrode diaphragm 14 and cathode current collector 10,
Effectively increase battery security in use.Meanwhile, what is contained in conductive bond coating 12 is a large amount of
Conductive agent so that cathode sheet has good electric conductivity, it is ensured that multiplying power, circulation of lithium ion battery etc.
Performance will not be deteriorated.
Beneficial effects of the present invention are illustrated with reference to embodiments.
Embodiment 1
40 mass parts PMMA, 30 mass parts polyimides, 30 mass parts conductive blacks are dissolved in NMP
Mixing in (1-METHYLPYRROLIDONE), solid content is about 10wt%, and dispersion at a high speed stirs, and is applied to
The two sides of aluminium foil, controls 1-6 μm of thickness, as conductive bond coating.
By 96 mass parts active material of cathode cobalt acid lithiums, 2 mass parts Kynoar, 2 mass parts conductive agents
Mixing, with NMP as solvent, solid content is 73wt%, and dispersion at a high speed is made the negative electrode slurry containing active material
Material；Cathode slurry is equably coated in the as above current collector aluminum foil two sides with conductive bond coating, through overdrying
Dry, roll squeezer compacting, obtains cathode sheet and is designated as C1.
Embodiment 2
By 40 mass parts PMMA, 35 mass parts polybismaleimides, the dissolving of 25 mass parts conductive blacks
Mix in NMP, solid content is about 15wt%, dispersion at a high speed stirs, and is applied to the two sides of aluminium foil,
2-10 μm of thickness of control, as conductive bond coating.
By 96 mass parts active material of cathode cobalt acid lithiums, 2 mass parts Kynoar, 2 mass parts conductive agents
Mixing, with NMP as solvent, solid content is 73wt%, and dispersion at a high speed is made the negative electrode slurry containing active material
Material；Cathode slurry is equably coated in the as above current collector aluminum foil two sides with conductive bond coating, through overdrying
Dry, roll squeezer compacting, obtains cathode sheet and is designated as C2.
Embodiment 3
30 mass parts PMMA, 35 mass parts polyacrylic acid, 35 mass parts conductive blacks are dissolved in NMP
Middle mixing, solid content is about 12wt%, and dispersion at a high speed stirs, and is applied to the two sides of aluminium foil, and control is thick
2-8 μm of degree, as conductive bond coating.
By 96 mass parts active material of cathode cobalt acid lithiums, 2 mass parts Kynoar, 2 mass parts conductive agents
Mixing, with NMP as solvent, solid content is 73wt%, and dispersion at a high speed is made the negative electrode slurry containing active material
Material；Cathode slurry is equably coated in the as above current collector aluminum foil two sides with conductive bond coating, through overdrying
Dry, roll squeezer compacting, obtains cathode sheet and is designated as C3.
Embodiment 4
35 mass parts PMMA, 35 mass parts polyacrylonitrile, 30 mass parts conductive blacks are dissolved in NMP
Middle mixing, solid content is about 8wt%, and dispersion at a high speed stirs, and is applied to the two sides of aluminium foil, controls thickness
2-8 μm, as conductive bond coating.
By 96 mass parts active material of cathode cobalt acid lithiums, 2 mass parts Kynoar, 2 mass parts conductive agents
Mixing, with NMP as solvent, solid content is 73wt%, and dispersion at a high speed is made the negative electrode slurry containing active material
Material；Cathode slurry is equably coated in the as above current collector aluminum foil two sides with conductive bond coating, through overdrying
Dry, roll squeezer compacting, obtains cathode sheet and is designated as C4.
Comparative example 1
70 mass parts PMMA, 30 mass parts conductive blacks are dissolved in NMP and are mixed, solid content is about
8wt%, at a high speed dispersion stirs, and is applied to the two sides of aluminium foil, controls 2-8 μm of thickness, as conductive viscous
Knot coating.
By 96 mass parts active material of cathode cobalt acid lithiums, 2 mass parts Kynoar, 2 mass parts conductive agents
Mixing, with NMP as solvent, solid content is 73wt%, and dispersion at a high speed is made the negative electrode slurry containing active material
Material；Cathode slurry is equably coated in the as above current collector aluminum foil two sides with conductive bond coating, through overdrying
Dry, roll squeezer compacting, obtains cathode sheet and is designated as T1.
Comparative example 2
By 96 mass parts active material of cathode cobalt acid lithiums, 2 mass parts Kynoar, 2 mass parts conductive agents
Mixing, with NMP as solvent, solid content is 73wt%, and dispersion at a high speed is made the negative electrode slurry containing active material
Material；Cathode slurry is equably coated in current collector aluminum foil two sides, is compacted by drying, roll squeezer, obtain the moon
Pole pole piece is designated as T2.
Prepare lithium ion battery
The preparation of anode pole piece：By the Delanium of 95 mass parts, the sodium carboxymethylcellulose of 1.0 mass parts,
The binding agent PVDF of the conductive black of 2 mass parts, 2 mass parts, is dispersed at a high speed in solvent NMP and is made
Solid content is the anode slurry of 45wt%；Anode slurry is equably coated in the two sides of copper foil of affluxion body, is passed through
Dry, roll squeezer is compacted, obtain anode pole piece and be designated as A.
The preparation of lithium ion battery：It is respectively welded on cathode sheet C1~C4, T1, T2 and anode pole piece A
Conductive lug, using 20 μm of polyethylene composite isolated film, is wound to form naked battery core, then use aluminum plastic film
Encapsulation.Using the lithium hexafluorophosphate electrolyte solution containing 1M, electrolyte solvent is propene carbonate/carbonic acid to electrolyte
Dimethyl ester/methyl ethyl ester=1:1:The mixed solvent of 1 (volume ratio).After encapsulation, to battery carry out chemical conversion and
Aging, it is the square flexible-packed battery of 70mm*40mm*3mm to obtain growing generous.Will be using different negative electrode poles
Piece C1~lithium ion battery obtained in C4, T1, is designated as D1, D2, D3, D4, Z1, Z2 respectively.
The performance test of cathode sheet and lithium ion battery
To the cathode sheet C1 in embodiment and comparative example~C4, T1, T2 and corresponding lithium ion battery
D1~D4, Z1, Z2 carry out following performance test, and test result is listed in into table 1~4.
1st, cathode sheet bonding force test：
Using high ferro tensiometer, to the bonding of the cathode sheet C1 in embodiment and comparative example~C4, T1, T2
Power carries out test sign, and data are shown in Table 1.
The pole piece bonding force test result of table 1, embodiment and comparative example
| Pole piece | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example 1 | Comparative example 2 |
| Bonding force N/m | 190 | 210 | 235 | 198 | 35 | 21 |
Be can be seen that from the test result of table 1：The pole piece bonding force of the embodiment of the present invention 1~4 is comparative example 1
Several times, and it is worst not contain the bonding force of comparative example 2 of conductive bond coating, and this explanation present invention contains two kinds
The conductive bond coating of binding agent can actually greatly improve bonding between negative electrode diaphragm and cathode current collector
Power.
2nd, internal resistance of cell test：
At 25 DEG C, the battery crossing current in embodiment and comparative example is charged to by 3.95V with 1C multiplying powers, with interior
Resistance instrument (frequency 1000Hz) the test internal resistance of cell, test result is shown in Table 2.
The internal resistance of cell test result of table 2, embodiment and comparative example
| Battery | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example 1 | Comparative example 2 |
| Internal resistance (mohm) | 32 | 33 | 35 | 32 | 31 | 30 |
Be can be seen that from the test result of table 2：The cell resistance of the embodiment of the present invention 1~4 is only to be slightly larger than
Comparative example 1 and comparative example 2, this explanation present invention is containing two kinds of conductive bond coatings of binding agent to cell resistance
Negative effect very little, can almost ignore.
3rd, the machinery abuse drift bolt test of battery：
10 batteries are respectively taken to above-described embodiment 1~4 and comparative example 1,2, is distinguished according to following testing process
Drift bolt test is carried out to these batteries：1) at 25 DEG C, battery crossing current is charged to by 4.2V with 1C multiplying powers,
Constant-voltage charge is to electric current<0.01C；2) with the steel nail of diameter about 3mm, with speed 100mm/s, from battery
The centre in face wide vertically penetrates battery；3) maximum temperature of battery surface is measured in test process, and is observed
Whether battery has blast, on fire, smoke event, has above-mentioned phenomenon then to represent that the security performance of battery is poor,
Test does not pass through, otherwise for test passes through；4) test of statistics battery is by number N, and records battery table
The maximum temperature in face, test result is shown in Table 3.
The battery drift bolt test result of table 3, embodiment and comparative example
4th, the machinery abuse impact test of battery：
10 batteries are respectively taken to above-described embodiment 1~4 and comparative example 1,2, is distinguished according to following testing process
Impact test is carried out to these batteries：1) at 25 DEG C, battery crossing current is charged to by 4.2V with 1C multiplying powers,
Constant-voltage charge is to electric current<0.01C；2) by a diameter of 20mm, length 30cm pole perpendicular to sample,
Fallen in the Vertical Free state at 50cm at pole with sample cross with the weight of 10Kg；3) test
During measure the maximum temperature of battery surface, and observe whether battery has blast, on fire, smoke event,
There is above-mentioned phenomenon then to represent that the security performance of battery is poor, test does not pass through, otherwise for test passes through；4) unite
The test of battery is counted by number N, and records the maximum temperature of battery surface, test result is shown in Table 4.
The battery impact result of table 4, embodiment and comparative example
Be can be seen that from the test result of table 3 and table 4：The battery of the embodiment of the present invention 1~4 only has only a few
Can not by drift bolt and impact test, but comparative example 1 battery none can be tested by drift bolt, only
One has passed through impact test；The battery of comparative example 2 none by drift bolt test and impact test；And,
The battery surface maximum temperature of embodiment 1~4 is also far below comparative example 1 and comparative example 2.It can be seen that, the present invention contains
The conductive bond coating of two kinds of binding agents greatly improved the security performance of battery.
In sum, the present invention will contain imide ring, carboxyl, acid anhydrides isopolarity base by way of film
High polymer cemented dose of group is made slurry and is coated on cathode current collector with PMMA blendings, and forming one layer has
The conductive bond coating of electron conduction, therefore the consumption of binder that need not change in negative electrode diaphragm just can reach
Stronger adhesive effect.It is additionally, since in conductive bond coating and adds substantial amounts of conductive agent, it is ensured that is cloudy
The electric conductivity of pole pole piece, therefore using after conductive bond coating, the chemical property of battery does not occur substantially
Deterioration, security is but significantly improved.
The announcement and teaching of book according to the above description, those skilled in the art in the invention can also be to above-mentioned
Implementation method carries out appropriate change and modification.Therefore, the invention is not limited in disclosed and described above
Some modifications and changes of the invention should also be as falling into the guarantor of claim of the invention by specific embodiment
In the range of shield.Although additionally, having used some specific terms in this specification, these terms are to be
Facilitate explanation, any limitation is not constituted to the present invention.
Claims (10)
1. a kind of lithium ion battery cathode sheet, including cathode current collector and negative electrode diaphragm, wrap in negative electrode diaphragm
Containing active material of cathode；It is characterized in that：Also include the conductive bond coating being coated on cathode current collector,
Negative electrode diaphragm is coated on conductive bond coating；The conductive bond coating includes conductive agent and two kinds of binding agents,
Wherein the first binding agent is polymethyl methacrylate, second binding agent be containing imide ring, carboxyl,
The high polymer of one or more polar groups in acid anhydrides.
2. lithium ion battery cathode sheet according to claim 1, it is characterised in that：Described second
Binding agent is one or more in polyimides, polybismaleimide, polyacrylic acid, polyacrylonitrile.
3. lithium ion battery cathode sheet according to claim 1, it is characterised in that：It is described the first
Binding agent and second mass ratio of binding agent are (0.85~1.33):1.
4. lithium ion battery cathode sheet according to claim 1, it is characterised in that：It is described conductive viscous
Conductive agent in knot coating is the one kind in conductive carbon black, acetylene black, Ketjen black, CNT, Graphene
Or it is several.
5. lithium ion battery cathode sheet according to claim 1, it is characterised in that：It is described conductive viscous
In knot coating, the weight content of binding agent is 65-75wt%, and the weight content of conductive agent is 25-35wt%.
6. lithium ion battery cathode sheet according to claim 1, it is characterised in that：It is described conductive viscous
The coating thickness for tying coating is 1-10 μm.
7. lithium ion battery cathode sheet according to claim 1, it is characterised in that：The cathodic coating
Conductive agent and binding agent are also included in piece, PVDF is contained in binding agent.
8. lithium ion battery cathode sheet according to claim 1, it is characterised in that：The negative electrode collection
Fluid is aluminium foil.
9. lithium ion battery cathode sheet according to claim 1, it is characterised in that：The lithium ion
Cell cathode pole piece is made up of cathode current collector, conductive bond coating and negative electrode diaphragm.
10. a kind of lithium ion battery, it includes cathode sheet, anode pole piece, electrolyte and is interval in negative and positive
Barrier film between the pole piece of pole, it is characterised in that：The cathode sheet is any one in claim 1 to 9
Lithium ion battery cathode sheet described in.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108736016A (en) * | 2018-08-01 | 2018-11-02 | 力信（江苏）能源科技有限责任公司 | Collector and the anode pole piece using its preparation, battery core |
| CN109585904A (en) * | 2017-09-29 | 2019-04-05 | 辉能科技股份有限公司 | Bendable lithium battery |
| CN109728244A (en) * | 2017-10-31 | 2019-05-07 | 宁德新能源科技有限公司 | Anode pole piece and lithium ion battery containing the anode pole piece |
| CN110661002A (en) * | 2018-12-29 | 2020-01-07 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN110660957A (en) * | 2018-12-29 | 2020-01-07 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN110661001A (en) * | 2018-12-29 | 2020-01-07 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN110676460A (en) * | 2018-12-29 | 2020-01-10 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN110943223A (en) * | 2019-04-15 | 2020-03-31 | 宁德时代新能源科技股份有限公司 | Positive pole piece and electrochemical device |
| CN110943200A (en) * | 2019-04-15 | 2020-03-31 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN110943222A (en) * | 2019-04-15 | 2020-03-31 | 宁德时代新能源科技股份有限公司 | Electrode plate and electrochemical device |
| CN111077069A (en) * | 2019-12-09 | 2020-04-28 | 陕西煤业化工技术研究院有限责任公司 | Method for rapidly screening binder for lithium battery |
| WO2020098791A1 (en) * | 2018-11-16 | 2020-05-22 | 宁德时代新能源科技股份有限公司 | Positive electrode sheet and electrochemical device |
| CN112186195A (en) * | 2019-07-01 | 2021-01-05 | 宁德时代新能源科技股份有限公司 | Positive pole piece and electrochemical device |
| CN112563511A (en) * | 2020-12-10 | 2021-03-26 | 深圳中科瑞能实业有限公司 | Aluminum-containing negative electrode material, negative electrode plate and lithium ion secondary battery |
| CN114616699A (en) * | 2021-03-24 | 2022-06-10 | 宁德新能源科技有限公司 | Current collector, electrochemical device using same, and electronic apparatus |
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