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Positive electrode slurry, positive electrode sheet and electrochemical energy storage device

A technology of positive electrode slurry and positive electrode sheet, which is applied in the field of energy storage devices, can solve problems such as the kinetic performance and safety performance of difficult lithium-ion batteries, achieve suppression of continuous electrochemical oxidation reactions, improve cycle performance, and be suitable for large-scale production Effect

Active Publication Date: 2021-07-13
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to introduce a variety of additives at the same time to make the lithium-ion battery effectively balance the kinetic performance and safety performance.

Method used

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  • Positive electrode slurry, positive electrode sheet and electrochemical energy storage device
  • Positive electrode slurry, positive electrode sheet and electrochemical energy storage device
  • Positive electrode slurry, positive electrode sheet and electrochemical energy storage device

Examples

Experimental program
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Effect test

preparation example Construction

[0036] In the positive electrode sheet according to the second aspect of the present application, the preparation method of the positive electrode sheet is not particularly limited, and it can be prepared by a conventional method, which may specifically include the steps of: mixing the positive electrode active material, the conductive agent, and the binder Uniform, then add a solvent to disperse, then add an additive containing an organic compound containing thienyl to further mix and disperse to obtain a positive electrode slurry; apply the positive electrode slurry obtained above to the surface of the positive electrode current collector, and then dry it to obtain a positive electrode slurry on the positive electrode collector The fluid forms a positive electrode slurry layer; then roll pressing, slitting and slicing are performed sequentially to obtain positive electrode sheets.

[0037] In the positive electrode sheet according to the second aspect of the present applicati...

Embodiment 1

[0056] (1) Preparation of positive electrode sheet

[0057] The positive electrode slurry layer is calculated as 100% by mass fraction, and the positive electrode active material LiNi 0.6 co 0.2 mn 0.2 o 2 , the positive electrode conductive agent Super P, and the binder PVDF are mixed evenly, and then the solvent NMP is added for dispersion, and compound 4 is added to the dispersion liquid as an organic compound containing a thienyl group to further mix and disperse to obtain the positive electrode slurry, wherein the positive electrode slurry The solid content of the material is 77wt%, LiNi 0.6 co 0.2 mn 0.2 o 2 The mass ratio of , Super P, PVDF, and compound 4 is 96:2:1:1, and then the positive electrode slurry is evenly coated on the surface of the positive electrode current collector aluminum foil with a thickness of 12 μm, and blown and dried at 80 ° C to obtain the positive electrode The slurry layer is then sequentially rolled, slitting and slicing to obtain the...

Embodiment 2

[0067] The preparation process of lithium ion battery is the same as embodiment 1, the difference is that,

[0068] (1) Preparation of positive electrode sheet

[0069] The positive electrode slurry was dried at 90° C. to obtain a positive electrode slurry layer.

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Abstract

The present application provides a positive electrode slurry, a positive electrode sheet and an electrochemical energy storage device. The positive electrode slurry includes solid components and a solvent. The solid component includes a cathode active material. The solid component also includes an additive which is an organic compound containing a thienyl group. The organic compound containing thienyl can passivate the positive electrode active material, effectively inhibit the continuous electrochemical oxidation reaction between the electrolyte and the positive electrode active material, thereby improving the oxidation resistance of the positive electrode sheet, and at the same time Improve the cycle performance, high temperature storage performance and overcharge safety performance of the electrochemical energy storage device, and reduce the gas production of the electrochemical energy storage device. In addition, the positive electrode sheet preparation process of the present application is simple, easy to operate, and suitable for large-scale production.

Description

technical field [0001] The present application relates to the field of energy storage devices, in particular to a positive electrode slurry, a positive electrode sheet and an electrochemical energy storage device. Background technique [0002] Lithium-ion batteries have rapidly occupied the consumer electronics market due to their advantages such as high working voltage, large specific capacity, small self-discharge, long cycle life, no memory effect, environmental friendliness and good safety, and their applications in the field of power storage are rapidly increasing. expansion. With the application of lithium-ion batteries in new fields such as electric vehicles, hybrid electric vehicles, large-scale energy storage power stations, and mobile energy storage equipment, it is imminent to further improve the energy density and safety performance of lithium-ion batteries. [0003] High-nickel cathode materials have become a research hotspot due to their higher theoretical spe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M4/131
CPCH01M4/131H01M4/364H01M4/505H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 张翠鞠峰田少杰张明韩昌隆
Owner CONTEMPORARY AMPEREX TECH CO
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