CN107994207A - Lithium ion battery and cathode plate thereof - Google Patents

Lithium ion battery and cathode plate thereof Download PDF

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Publication number
CN107994207A
CN107994207A CN201610942995.2A CN201610942995A CN107994207A CN 107994207 A CN107994207 A CN 107994207A CN 201610942995 A CN201610942995 A CN 201610942995A CN 107994207 A CN107994207 A CN 107994207A
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lithium ion
ion battery
cathode plate
barrier layer
cathode
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CN107994207B (en
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李星
张小文
来佑磊
金海族
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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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
    • 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
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • 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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  • Chemical & Material Sciences (AREA)
  • 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 lithium ion battery cathode plate, which comprises a cathode current collector, an active material layer arranged on the cathode current collector, and a barrier layer arranged on the active material layer, wherein the barrier layer comprises a porous carbon material, a binder and a conductive agent, the aperture of the porous carbon material is 2-50 nm, and the specific surface area is 500-2000 m-2Per g, pore volume of 1.00-2.25cm3(ii) in terms of/g. The cathode plate of the lithium ion battery can not only obviously reduce the deposition of transition metal on the anode, but also can not influence the discharge capacity of the lithium ion battery at high and low temperatures, can obviously improve the cycle performance of the lithium ion battery and prolong the cycle life of the battery.

Description

Lithium ion battery and its cathode sheets
Technical field
The invention belongs to technical field of lithium ion, it is more particularly related to a kind of lithium ion battery and its Cathode sheets.
Background technology
In recent years, lithium ion battery is developed rapidly, while it is required also higher and higher.Lithium ion battery is general Need to meet following characteristics：(1) (wherein HEV hybrid vehicles are to power requirement higher, energy storage for high-energy and high power density Battery is slightly lower to power requirement)；(2) operating temperature range is wide, and environmental suitability is strong；(3) long cycle life and service life； (4) prominent security reliability.
For the lithium ion battery containing transition metal, in cyclic process, conducting salt LiPF in electrolyte6It can occur point Solution, forms LiF and PF5, PF5Hydrolysis can occur with last traces water in electrolyte, HF be produced, by sour gas and itself The influence of structural stability, the transition metal in cathode material are easily dissolved into electrolyte, with circulation be diffused into anode and The decomposition of the surface catalysis SEI films of anode pole piece, influences the stability of SEI films, accelerates the consumption of active lithium, while can also trigger Other side reactions, so as to accelerate the capacity attenuation of battery.
For example, for the lithium ion battery containing transient metal Mn, in charge and discharge process, from+3 to+4 valency of valence state of Mn Change, is also easy to produce Jahn-Teller effects, and distortion of lattice occurs and causes volume contraction or expansion so that structure becomes unstable Determine and collapse.At high temperature, especially in high voltage system, the HF of trace can cause Mn in electrolyte2+Dissolution, cause sharp crystalline substance The destruction of stone structure, has significantly speeded up the decay of battery capacity, its chemical equation is as follows：4HF+2LiMn2O4→3γ- MnO2+MnF2+2LiF+2H2O。
Existing document report：Metal Mn can influence the insertion and abjection of Li in the deposition of anode surface；With circulation Carry out, be able to detect that more Mn, Mn react in anode and SEI on anode material surface, destroy the stabilization of SEI films Property, increase the impedance of anode, accelerate the capacitance loss of lithium ion battery.
Therefore, existing NCM (cobalt nickel lithium manganate ternary material), NCA (nickel cobalt lithium aluminate ternary material), LiMn2O4, phosphorus In cyclic process, some side reactions constantly occur the lithium ion batteries such as sour iron lithium, lithium-rich manganese base material for anode material surface, Some sour gas can be produced, are diffused into cathode, some transition metal dissolutions can be caused.In addition, in continuous charge and discharge process In, the structural stability of cathode material is deteriorated, and will also result in a part of transition metal dissolution.The transition metal of dissolution is diffused into sun The surface of pole material, destroys the stability of SEI films, increases the consumption of active lithium, accelerates capacity of lithium ion battery decay, finally leads Cause the cycle life of reduction battery.
In view of the above-mentioned problems, the measure used at present is mostly directly to mix the porous carbon with adsorptivity in active material layer Material is as conductive agent, but porous carbon materials have extremely strong imbibition ability in itself, and the addition of porous carbon materials can reduce work Cohesive force between property material and collector, so as to deteriorate the power-performance and security performance of lithium ion battery.
In view of this, it is necessory to provide a kind of deposition that can reduce transition metal on anode, and battery can be improved and followed The cathode plate of lithium ion battery of ring performance.
The content of the invention
It is an object of the invention to：A kind of lithium ion battery and its cathode sheets are provided, it can not only reduce transition metal and exist Deposition on anode, and the cycle performance of battery can be significantly improved.
In order to realize foregoing invention purpose, the present invention provides a kind of cathode plate of lithium ion battery, it include cathode current collector, The active material layer being arranged on cathode current collector, and the barrier layer being arranged on active material layer, wherein, the barrier layer Comprising porous carbon materials, binding agent and conductive agent, the aperture of porous carbon materials is 2nm~50nm, specific surface area 500- 2000m2/ g, pore volume 1.00-2.25cm3/g。
Barrier layer containing porous carbon materials is set outside active material layer, and porous carbon materials have excellent adsorptivity Can, while also there is good electric conductivity, chemical inertness and corrosion resistance, therefore can be adsorbed using its abundant pore structure The transition metal being dissolved out from cathode material, and the transition metal being dissolved out is constrained in into cathode, prevent it to be diffused into Anode surface；In addition, porous material has larger specific surface area, substantial amounts of electrolyte can be stored, so as to extend battery Cycle life.
One kind as cathode plate of lithium ion battery of the present invention is improved, and the aperture of the porous carbon materials is 15-50nm, than Surface area is 820-2000m2/ g, pore volume 1.42-2.25cm3/g。
As cathode plate of lithium ion battery of the present invention one kind improve, the porous carbon materials for activated carbon, carbon nanotubes, One or more in mesoporous carbon or carbide-derived carbon.
One kind as cathode plate of lithium ion battery of the present invention is improved, and the thickness on the barrier layer is 2-25 μm.
One kind as cathode plate of lithium ion battery of the present invention is improved, and the thickness on the barrier layer is 15-25 μm.
One kind as cathode plate of lithium ion battery of the present invention is improved, the mass percent of each component in the barrier layer For：Porous carbon materials 40~90%, binding agent 5-40%, conductive agent 5~55%.
One kind as cathode plate of lithium ion battery of the present invention is improved, and the conductive agent in the barrier layer is conductive carbon black SP, electrically conductive graphite, SP-Li, can qin be black, the one or more in carbon fiber, graphene.
One kind as cathode plate of lithium ion battery of the present invention is improved, and the binding agent in the barrier layer is polyvinylidene fluoride Alkene, sodium carboxymethylcellulose, sodium alginate, polyvinyl alcohol, polytetrafluoroethylene (PTFE), polyurethane, polyacrylic acid, acrylic acid-acrylic acyl One or more in amine copolymer thing.
One kind as cathode plate of lithium ion battery of the present invention is improved, and the active material contained in the active material layer is One or more in nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiMn2O4, LiFePO4, lithium-rich manganese base material.
In order to realize foregoing invention purpose, present invention also offers a kind of lithium ion battery, it includes cathode sheets, anode Piece, the membrane being interval between cathode sheets and anode strip, and electrolyte, wherein, the cathode sheets are foregoing lithium ion battery Cathode sheets.
Relative to the prior art, cathode plate of lithium ion battery of the present invention has following advantageous effects：
Barrier layer of the setting containing porous carbon materials outside active material layer, the pore structure enriched using porous carbon materials, Can not only substantially reduce deposition of the transition metal on anode, and will not be to lithium ion battery under high/low temperature discharge capability Impact, the cycle performance of lithium ion battery can be significantly improved, extend the cycle life of battery.
Brief description of the drawings
With reference to the accompanying drawings and detailed description, cathode plate of lithium ion battery of the present invention is described in detail, wherein：
Fig. 1 is the embodiment of the present invention 1 and the discharge capacity comparison diagram of comparative example lithium ion battery at different temperatures.
Fig. 2 is the embodiment of the present invention 1 and the cycle performance comparison diagram of comparative example lithium ion battery.
Embodiment
In order to become apparent from goal of the invention, technical solution and its technique effect of the present invention, below in conjunction with attached drawing and tool The present invention will be described in further detail for body embodiment.It should be appreciated that the specific embodiment party described in this specification Formula is not intended to limit the present invention just for the sake of explaining the present invention.
Cathode plate of lithium ion battery provided by the invention, it includes cathode current collector, the work being arranged on cathode current collector Property material layer, and the barrier layer being arranged on active material layer, wherein, barrier layer includes porous carbon materials, binding agent and leads Electric agent, the aperture of porous carbon materials is 2nm~50nm, specific surface area 500-2000m2/ g, pore volume 1.00-2.25cm3/ g。
Porous carbon materials can select any one in activated carbon, carbon nanotubes, mesoporous carbon or carbide-derived carbon or more Kind, these types of material can reach the purpose of the present invention.
The thickness on barrier layer is 2-25 μm.The thickness on barrier layer is in certain scope, then the quality hundred of porous carbon materials Divide than being in suitable scope, so as to ensure, the then transition of respective anode deposition strong to the adsorption capacity of transition metal ions Tenor is low, and the capacity of battery will not decay too fast；And barrier layer is too thin or the too thick capacity that can all cause battery reduces, no Preferable effect can be reached.
The mass percent of each component is in barrier layer：Porous carbon materials 40~90%, binding agent 5-40%, conductive agent 5 ~55%.Because the ratio of binding agent contained by barrier layer is higher, after heat pressing process, barrier layer and active material can be increased Cohesive force between layer and isolation film, ensures battery core adhesiveness of barrier layer and active material layer in circulation and storing process Preferably, do not fall off, and realize cathode sheets and isolation film there is good interface, improve circulation and the storage of battery Energy.
Conductive agent in barrier layer can select conductive carbon black SP, electrically conductive graphite, SP-Li, can qin be black, carbon fiber, graphite One or more in alkene.
Binding agent in barrier layer can select Kynoar, sodium carboxymethylcellulose, sodium alginate, polyvinyl alcohol, One or more in polytetrafluoroethylene (PTFE), polyurethane, polyacrylic acid, acrylic acid-acrylamide copolymer.
The active material contained in active material layer can select nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiMn2O4, ferric phosphate One or more in lithium, lithium-rich manganese base material.
Embodiment
Embodiment 1：
1) preparation of cathode sheets
1. the preparation of active material layer
Kynoar (PVDF) is dissolved in 1-methyl-2-pyrrolidinone (NMP) solvent according to a certain percentage, is fully stirred Mix to obtain the polymer solution of Kynoar；It is active material according to mass ratio：Binding agent：Conductive agent=95:2:3 formula Add active material nickel-cobalt-manganese ternary material LiNi0.5Co0.2Mn0.3O2, binding agent PVDF and conductive agent SP (conductive black SP), Finally vacuumize removing bubble；Required cathode slurry is obtained with the filtering of 150 mesh stainless steel mesh；The cathode slurry that will be obtained It is uniformly coated on cathode current collector, it is then dry at 85 DEG C, active material layer is formed, thickness is 115 μm.
Wherein, active material, which removes, may be selected nickel-cobalt-manganese ternary material LiNi0.5Co0.2Mn0.3O2Outside, it is also an option that transition The different cobalt nickel lithium manganate ternary material of metal element content, nickel cobalt lithium aluminate ternary material, LiMn2O4, LiFePO4 and rich lithium Mn-based material.
2. the preparation on barrier layer
Porous carbon materials selection average pore size is 20nm, specific surface area 1020m2/ g, pore volume 1.62cm3The work of/g Property charcoal, binding agent selection Kynoar (PVDF), conductive agent selection conductive carbon black SP；Activated carbon is added to NMP (N- methyl Pyrrolidones) in solution, 4-12h is first stirred, SP is then added, 4-12h is stirred, finally PVDF is added in above-mentioned solution, Slurry is formed, the wherein mass ratio of activated carbon, PVDF and SP is 80：10：10；Above-mentioned slurry is applied on active material layer, Barrier layer is formed, the thickness on barrier layer is 3 μm.It is dry, obtain cathode sheets.
2) preparation of anode strip
By butadiene-styrene rubber (SBR) dissolving in aqueous, it is sufficiently stirred to form SBR aqueous solutions, then by a certain amount of people Make graphite, SP and sodium carboxymethylcellulose (CMC) to add in SBR aqueous solutions, its weight ratio is Delanium:SP:CMC:SBR= 96:1:1:2, it is dry at 110 DEG C after stirring evenly on the copper foil coated in 8 μ m-thicks.Dried pole piece is cold-pressed cut-parts, Obtain anode strip.
3) membrane
Membrane uses polypropylene (PP)/polyethylene (PE)/three layers of composite porous film of polypropylene (PP) that thickness is 12 μm.
4) preparation of electrolyte
Isometric ethylene carbonate (EC), methyl ethyl carbonate (EMC) and diethyl carbonate (DEC) are uniformly mixed, obtained To mixed solvent, lithium hexafluoro phosphate (LiPF is then added6), wherein LiPF6Concentration be 1mol/L.
5) battery makes
Above cathode sheets, anode strip, membrane are formed into battery core by winding or lamination process, battery core is then put into packaging In bag, after injecting electrolyte, chemical conversion, encapsulation etc., are assembled into battery.
Embodiment 2：
Embodiment 2 is substantially the same manner as Example 1, and difference is：Porous carbon materials select mesoporous carbon, and average pore size is 2nm, specific surface area 500m2/ g, pore volume 1.00cm3/g。
Embodiment 3：
Embodiment 3 is substantially the same manner as Example 1, and difference is：The average pore size of activated carbon is 50nm, specific surface area For 2000m2/ g, pore volume 2.25cm3/g。
Embodiment 4：
Embodiment 4 is substantially the same manner as Example 1, and difference is：Barrier layer thickness is 15 μm, and activated carbon is flat Equal aperture is 15nm, specific surface area 820m2/ g, pore volume 1.42cm3/g。
Embodiment 5：
Embodiment 5 is substantially the same manner as Example 1, and difference is：Barrier layer thickness is 25 μm, and activated carbon is flat Equal aperture is 30nm, specific surface area 1350m2/ g, pore volume 1.82cm3/g。
Embodiment 6：
Embodiment 6 is substantially the same manner as Example 1, and difference is：The mass ratio of activated carbon, PVDF and SP in barrier layer For 90：5：5.
Comparative example：
Comparative example is substantially the same manner as Example 1, and difference is：The preparation of cathode sheets.
The preparation of cathode sheets：Kynoar (PVDF) is dissolved in 1-methyl-2-pyrrolidinone (NMP) according to a certain percentage In solvent, it is sufficiently stirred to obtain the polymer solution of Kynoar；It is active material according to mass ratio：Binding agent：Conductive agent =95:2:3 formula adds active material nickel-cobalt-manganese ternary material LiNi0.5Co0.2Mn0.3O2, binding agent PVDF and conductive agent SP, finally vacuumizes removing bubble；Required cathode slurry is obtained with the filtering of 150 mesh stainless steel mesh；The cathode that will be obtained Slurry is uniformly coated on collector, and thickness is 115 μm, then dry at 85 DEG C.The dry pole piece completed is cold-pressed and is cut out Piece, is made cathode sheets.
Performance test
Embodiment 1-6 and comparative example battery are tested as follows：
1) the discharge capacity test under different temperatures
Test temperature is：- 40 DEG C, -20 DEG C, 0 DEG C, 10 DEG C, 25 DEG C, 45 DEG C, 55 DEG C；Rate of charge is 1C, discharge-rate For 1C, discharge and recharge section is 2.8V-4.2V, tests the discharge capacity of battery at this temperature.
2) cycle performance is tested under room temperature
At 25 DEG C, battery capacity conservation rate after 1000 circulations is tested, wherein charge step is first with the charging times of 2C Rate constant-current charge to 4.20V, then again constant-voltage charge until electric current is down to 0.05C；Discharge step is permanent with the discharge-rate of 3C Stream discharges into 2.8V.
3) mass percent of transition metal is tested in anode strip
After battery has carried out 1000 circulations at normal temperatures, battery is disassembled, using Inductively coupled plasma mass spectrometry (ICP) method, after test loop in anode strip transition metal mass percent.Table 1 is that embodiment 1-6 and comparative example battery follow The mass percent correction data of transition metal in anode strip after ring.
It can be seen that the room temperature capacity of embodiment 1-6 batteries and the room temperature capacity of comparative example battery from the test result of table 1 No significant difference, and also slightly improved relative to comparative example；And after circulating 1000 times, transition gold in embodiment 1-6 anode strips Belonging to content has significant decline relative to comparative example, wherein, the content of Ni is down within 0.005%, and the content of Co is down to Within 0.005%, the content of Mn is also down within 0.0072%.This show cathode plate of lithium ion battery of the present invention will not to lithium from The room temperature capacity of sub- battery produces obvious influence, and can substantially reduce deposition of the transition metal in respective anode, from And further improve the cycle performance of battery.
The mass percent of transition metal in 1 anode strip of table
Sample Room temperature capacity (Ah) Ni (wt.%) Co (wt.%) Mn (wt.%)
Embodiment 1 38.83 0.0012 0.0015 0.0040
Embodiment 2 38.86 0.0043 0.0050 0.0072
Embodiment 3 38.90 0.0009 0.0012 0.0010
Embodiment 4 38.86 0.0014 0.0018 0.0050
Embodiment 5 38.78 0.0011 0.0013 0.0028
Embodiment 6 38.81 0.0011 0.0010 0.0024
Comparative example 38.77 0.0200 0.0170 0.0670
This is because containing activated carbon or mesoporous carbon in barrier layer, activated carbon or mesoporous carbon have excellent absorption property, Also there is good electric conductivity, chemical inertness and corrosion resistance at the same time, thus using its abundant pore structure can adsorb from The transition metal being dissolved out in cathode material, and the transition metal being dissolved out is constrained in into cathode, prevent it to be diffused into sun Pole surface, therefore deposition of the transition metal on anode can be substantially reduced.
Discharge capacity comparison diagrams of the Fig. 1 for the lithium ion battery of the embodiment of the present invention 1 and comparative example at different temperatures.Knot Fruit shows embodiment 1, and capacity retention ratio is basically identical at different temperature with comparative example.Illustrate that lithium ion battery of the present invention is cloudy Pole piece sets barrier layer on active material layer, and discharge capability of the battery under high/low temperature will not be impacted substantially.
Fig. 2 is the embodiment of the present invention 1 and the cycle performance comparison diagram of comparative example lithium ion battery.The result shows that using this hair The cycle performance of bright 1 battery of embodiment is substantially better than comparative example.Illustrate that cathode plate of lithium ion battery of the present invention can significantly improve The cycle performance of battery.
The detailed description of cathode plate of lithium ion battery of the present invention can be seen that relative to the prior art with reference to more than, this Invention at least has following advantageous effects：
Barrier layer of the setting containing porous carbon materials outside active material layer, the pore structure enriched using porous carbon materials, Can not only substantially reduce deposition of the transition metal on anode, and will not be to lithium ion battery under high/low temperature discharge capability Impact, the cycle performance of lithium ion battery can be significantly improved, extend the cycle life of battery.
According to above-mentioned principle, the present invention can also carry out the above embodiment appropriate change and modification.Therefore, this hair It is bright to be not limited to embodiment disclosed and described above, some modifications and changes of the present invention should also be as falling into this In the scope of the claims of invention.In addition, although used some specific terms in this specification, but these terms Merely for convenience of description, do not limit the present invention in any way.

Claims (10)

1. a kind of cathode plate of lithium ion battery, it includes cathode current collector, the active material layer being arranged on cathode current collector, with And it is arranged on the barrier layer on active material layer, it is characterised in that：The barrier layer includes porous carbon materials, binding agent and conduction Agent, the aperture of the porous carbon materials is 2nm~50nm, specific surface area 500-2000m2/ g, pore volume 1.00- 2.25cm3/g。
2. cathode plate of lithium ion battery according to claim 1, it is characterised in that：The aperture of the porous carbon materials is 15-50nm, specific surface area 820-2000m2/ g, pore volume 1.42-2.25cm3/g。
3. cathode plate of lithium ion battery according to claim 1, it is characterised in that：The porous carbon materials for activated carbon, One or more in carbon nanotubes, mesoporous carbon or carbide-derived carbon.
4. cathode plate of lithium ion battery according to claim 1, it is characterised in that：The thickness on the barrier layer is 2-25 μ m。
5. cathode plate of lithium ion battery according to claim 1, it is characterised in that：The thickness on the barrier layer is 15-25 μ m。
6. cathode plate of lithium ion battery according to claim 1, it is characterised in that：The quality of each component in the barrier layer Percentage is：Porous carbon materials 40~90%, binding agent 5-40%, conductive agent 5~55%.
7. cathode plate of lithium ion battery according to claim 1, it is characterised in that：Conductive agent in the barrier layer is to lead The black SP of electrical carbon, electrically conductive graphite, SP-Li, can qin be black, the one or more in carbon fiber, graphene.
8. cathode plate of lithium ion battery according to claim 1, it is characterised in that：Binding agent in the barrier layer is poly- Vinylidene, sodium carboxymethylcellulose, sodium alginate, polyvinyl alcohol, polytetrafluoroethylene (PTFE), polyurethane, polyacrylic acid, acrylic acid- One or more in acrylamide copolymer.
9. cathode plate of lithium ion battery according to claim 1, it is characterised in that：The work contained in the active material layer Property material be nickle cobalt lithium manganate, nickel cobalt lithium aluminate, LiMn2O4, LiFePO4, the one or more in lithium-rich manganese base material.
10. a kind of lithium ion battery, including cathode sheets, anode strip, the membrane being interval between cathode sheets and anode strip, Yi Ji electricity Solve liquid, it is characterised in that：The cathode sheets are any cathode plate of lithium ion battery of claim 1-9.
CN201610942995.2A 2016-10-26 2016-10-26 Lithium ion battery and cathode plate thereof Active CN107994207B (en)

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CN112703621A (en) * 2020-03-20 2021-04-23 广东省皓智科技有限公司 Cathode for secondary battery and cathode slurry
CN115838163A (en) * 2022-07-12 2023-03-24 宁德时代新能源科技股份有限公司 Porous carbon material and preparation method thereof, negative electrode plate and lithium ion battery
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WO2023225797A1 (en) * 2022-05-23 2023-11-30 宁德时代新能源科技股份有限公司 Positive electrode sheet used for secondary battery, and secondary battery

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CN111048781A (en) * 2019-12-20 2020-04-21 国联汽车动力电池研究院有限责任公司 High-compaction-resistant composite conductive agent and application thereof in lithium ion battery
CN112703621A (en) * 2020-03-20 2021-04-23 广东省皓智科技有限公司 Cathode for secondary battery and cathode slurry
WO2023225797A1 (en) * 2022-05-23 2023-11-30 宁德时代新能源科技股份有限公司 Positive electrode sheet used for secondary battery, and secondary battery
CN115838163A (en) * 2022-07-12 2023-03-24 宁德时代新能源科技股份有限公司 Porous carbon material and preparation method thereof, negative electrode plate and lithium ion battery
CN116565293A (en) * 2023-07-06 2023-08-08 宁德新能源科技有限公司 Electrochemical device and electronic device

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