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Lithium-ion battery and its cathode plate

A lithium-ion battery, cathode sheet technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries and other directions, can solve the problems of inability to improve the cathode oxidation resistance, reduce the electrolyte contact interface, etc., to broaden the use range, The effect of improving high pressure cycling and high temperature storage performance and reducing the degree of oxidation

Active Publication Date: 2016-05-18
DONGGUAN AMPEREX TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unable to improve the oxidation resistance of the cathode under high potential conditions, and reduce the contact interface between the electrolyte and the cathode material

Method used

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  • Lithium-ion battery and its cathode plate
  • Lithium-ion battery and its cathode plate
  • Lithium-ion battery and its cathode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this embodiment, polymethyl acrylate is used as the cathode polymer additive, and the added mass fraction is 0.1%.

[0026] Cathode electrode sheet preparation: LiCoO 2 (lithium cobaltate), Super-P (conductive carbon black), PVDF (polyvinylidene fluoride), and polymethyl acrylate are added in N,N-dimethylformamide (NMP ) mixed and stirred evenly to obtain a slurry with a certain fluidity, coated on both sides of a 16 μm thick metal aluminum foil, and dried to form a positive electrode sheet with a certain degree of softness. Then, after cold pressing and slitting, the positive electrode lug made of 0.1mm thick aluminum sheet is welded on the aluminum foil to obtain the positive electrode sheet.

[0027] Anode sheet preparation: Graphite, Super-P (conductive carbon black), CMC (water-based binder, carboxymethyl cellulose), and SBR (StyreneButadieneRubber, a kind of rubber) are 95.5:1.5:1.5 according to the mass ratio: 1.5 Add water to mix and stir evenly to obtain a...

Embodiment 2

[0030] In this embodiment, polyethyl acrylate is used as the cathode polymer additive, and the added mass fraction is 0.4%.

[0031] Cathode electrode sheet preparation: LiCoO 2 (Lithium cobaltate), Super-P (conductive carbon black), PVDF (polyvinylidene fluoride), and polyethyl acrylate are added in N,N-dimethylformamide (NMP ) mixed and stirred evenly to obtain a slurry with a certain fluidity, coated on both sides of a 16 μm thick metal aluminum foil, and dried to form a positive electrode sheet with a certain degree of softness. Then, after cold pressing and slitting, the positive electrode lug made of 0.1mm thick aluminum sheet is welded on the aluminum foil to obtain the positive electrode sheet.

[0032] The preparation method of the anode pole piece and the lithium ion battery are the same as in Example 1.

Embodiment 3

[0034] In this embodiment, polyethyl acrylate is used as the cathode polymer additive, and the added mass fraction is 0.6%.

[0035] Cathode electrode sheet preparation: LiCoO 2(Lithium cobalt oxide), Super-P (conductive carbon black), PVDF (polyvinylidene fluoride), and polypropyl acrylate are added in N, N-dimethylformamide (NMP ) mixed and stirred evenly to obtain a slurry with a certain fluidity, coated on both sides of a 16 μm thick metal aluminum foil, and dried to form a positive electrode sheet with a certain degree of softness. Then, after cold pressing and slitting, the positive electrode lug made of 0.1mm thick aluminum sheet is welded on the aluminum foil to obtain the positive electrode sheet.

[0036] The preparation method of the anode pole piece and the lithium ion battery are the same as in Example 1.

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Abstract

The invention discloses a cathode pole piece of a lithium ion battery. The cathode pole piece comprises a cathode current collector and a cathode diaphragm coating the cathode current collector, wherein the cathode diaphragm contains a high-molecular polymer additive which protects cathode active materials at a high potential by self oxidation. The high-molecular polymer additive has a certain heat stability and a relatively good film forming ability, providing an effective improvement of a contact interface between particles of the cathode active materials and electrolyte, a reduction of oxidation degree of the electrolyte, and a reduction of gas generated thereby, so that high-voltage cycle and high-temperature storage performances of the lithium ion battery are improved, and thickness expansion of an electrical core is reduced. Further, the invention discloses a lithium ion battery using the above cathode pole piece.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery with good high-voltage cycle and high-temperature storage performance and a cathode sheet thereof. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic devices, electric vehicles and energy storage systems due to their high voltage, high specific energy, long charge and discharge life, safety, and environmental protection. As the marketization of lithium-ion batteries continues to deepen, people's expectations for the performance of lithium-ion batteries are getting higher and higher, and the application conditions are becoming more and more stringent. [0003] This aspect is reflected in the fact that people have higher and higher requirements for the energy density of lithium-ion batteries, which has reached 500Wh / L. In the lithium-ion battery system, the cathode is a strong oxidizing transition metal ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCY02E60/10
Inventor 罗丹涂健陈轩周铁刚杨勇赵丰刚
Owner DONGGUAN AMPEREX TECH
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