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A kind of lithium ion battery positive plate and preparation method thereof

A lithium-ion battery and positive electrode technology, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problem of poor high-rate charge-discharge cycle performance, low energy density of lithium manganate materials, and difficulty in meeting the battery life requirements of electronic equipment at the same time. and high-rate charging and discharging requirements, to achieve the effect of good cycle performance, guaranteed energy density, and high volumetric energy density

Active Publication Date: 2020-09-01
CHONGQING VDL ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the satisfactory charge-discharge rate of consumer batteries is generally between 0.5C and 3C. If the rate exceeds 3C, the energy density will be greatly sacrificed, and it is difficult to meet the battery life requirements and high-rate charge-discharge requirements of electronic devices at the same time.
Lithium manganese oxide cathode material is usually used to meet the rate performance, but the energy density of lithium manganese oxide material is low, and simply using lithium cobalt oxide material as the positive electrode, although the energy density of the battery can be guaranteed, but the cycle performance of high rate charge and discharge is poor

Method used

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  • A kind of lithium ion battery positive plate and preparation method thereof
  • A kind of lithium ion battery positive plate and preparation method thereof
  • A kind of lithium ion battery positive plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] S1, prepare the slurry of conductive coating 2

[0042] According to the mass ratio of conductive agent: PVDF: NMP = 5:5:90, weigh the adhesive PVDF and solvent NMP, and according to the mass ratio of conductive agent, acetylene black: conductive graphite: carbon nanotube = 30:30:0, weigh Take acetylene black, conductive graphite and carbon nanotubes, stir evenly to obtain the required coating slurry.

[0043] S2,, prepare the current collector containing conductive coating

[0044] The prepared slurry is coated on the outer surface of a 14μ aluminum foil current collector, and dried to a coating thickness of 2-4 μm to obtain a current collector containing a conductive coating.

[0045] S3, preparing positive electrode slurry

[0046] According to the mass ratio of lithium cobaltate: conductive agent: PVDF: NMP = 95:3:2:40, weigh lithium cobaltate, adhesive PVDF and solvent NMP, and according to the mass ratio of conductive agent acetylene black: conductive graphite: ...

Embodiment 2

[0054] S1, preparation of conductive coating slurry

[0055] According to the mass ratio of conductive agent: PVDF: NMP = 5:5:90, weigh the adhesive PVDF and solvent NMP, and according to the mass ratio of conductive agent, acetylene black: conductive graphite: carbon nanotube = 0:0:30, weigh Take acetylene black, conductive graphite and carbon nanotubes, stir evenly to obtain the required coating slurry.

[0056] S2, preparation of the current collector containing the conductive coating

[0057] The prepared slurry is coated on the outer surface of a 14μ aluminum foil current collector, and dried to a coating thickness of 2-4 μm to obtain a current collector containing a conductive coating.

[0058] S3, preparing positive electrode slurry

[0059] According to the mass ratio of lithium cobaltate: conductive agent: PVDF: NMP = 95:3:2:40, weigh lithium cobaltate, adhesive PVDF and solvent NMP, and according to the mass ratio of conductive agent acetylene black: conductive gra...

Embodiment 3

[0067] S1, preparation of conductive coating slurry

[0068] According to the mass ratio of conductive agent: PVDF: NMP = 5:5:90, weigh the adhesive PVDF and solvent NMP, and according to the mass ratio of conductive agent, acetylene black: conductive graphite: carbon nanotube = 40:30:30, weigh Take acetylene black, conductive graphite and carbon nanotubes, stir evenly to obtain the required coating slurry.

[0069] S2, preparation of the current collector containing the conductive coating

[0070] The prepared slurry is coated on the outer surface of a 14μ aluminum foil current collector, and dried to a coating thickness of 2-4 μm to obtain a current collector containing a conductive coating.

[0071] S3, preparing positive electrode slurry

[0072] According to the mass ratio of lithium cobaltate: conductive agent: PVDF: NMP = 95:3:2:40, weigh lithium cobaltate, adhesive PVDF and solvent NMP, and according to the mass ratio of conductive agent acetylene black: conductive g...

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Abstract

The invention provides a lithium ion battery positive plate. The positive plate comprises a current collector, wherein a conductive coating is arranged on the outer surface of the current collector, apositive separator is arranged on the surface, separated from the current collector, of the conductive coating, and a coating is arranged on the surface, away from the conductive coating, of the positive separator. The positive separator is mainly prepared from a lithium cobaltate material to ensure energy density of a battery; during charging and discharging, the coating of the current collectorcan accelerate electronic conduction, the lithium manganate coating can accelerate ionic conduction, and accordingly, rapid charging and discharging of the battery are facilitated. The battery prepared by using the positive plate has high volume energy density and high-rate charging and discharging performance, and has good cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery positive electrode sheet and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries are widely used in consumer electronic devices, such as mobile phones, laptops, and drones, due to their environmental friendliness, high energy density, and good cycle performance. People's requirements for the performance of lithium-ion batteries are also getting higher and higher, not only requiring lithium-ion batteries to have higher and higher energy density, but also requiring lithium-ion batteries to have better rate performance, satisfying high-rate charging and large-rate discharge. At present, the satisfactory charge-discharge rate of consumer batteries is generally between 0.5C and 3C. If the rate exceeds 3C, the energy density will be greatly sacrificed, and it is difficult to meet the battery life requirements...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/66H01M4/139H01M4/1395H01M4/04H01M10/0525
CPCH01M4/0404H01M4/139H01M4/1395H01M4/667H01M10/0525Y02E60/10
Inventor 朱传钦周显茂
Owner CHONGQING VDL ELECTRONICS