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Battery negative electrode, preparation method thereof and lithium ion battery

A negative electrode and preparation method technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor comprehensive electrochemical performance, unsatisfactory electrochemical performance, scrap rate, etc., and achieve stable electrochemical performance and excellent comprehensive Effect of electrochemical performance and uniform thickness

Inactive Publication Date: 2016-11-16
JIAN UTILITY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a battery negative electrode and its preparation method and the preparation method of the battery negative electrode slurry, to solve the problem of the preparation of the existing electrode containing a water-based binder represented by LA133 It is easy to stick to the roller and lead to scrap rate, and the technical problem of poor comprehensive electrochemical performance
[0006] Another object of the present invention is to provide a lithium-ion battery to solve the technical problem that the electrochemical performance of the existing lithium-ion battery containing a water-based binder represented by LA133 is not ideal

Method used

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  • Battery negative electrode, preparation method thereof and lithium ion battery
  • Battery negative electrode, preparation method thereof and lithium ion battery
  • Battery negative electrode, preparation method thereof and lithium ion battery

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preparation example Construction

[0055] In yet another aspect, on the basis of the preparation method of the battery negative electrode slurry in the above embodiments of the invention, the embodiments of the present invention also provide a method for preparing a battery negative electrode. The method for preparing the negative electrode of the battery in the embodiment of the present invention includes the step of coating the slurry prepared by the method for preparing the negative electrode slurry of the battery in the embodiment of the present invention above on the surface of the current collector. Wherein, the current collector is a common current collector for electrodes as described above. Since the battery negative electrode preparation method of the present invention adopts the battery negative electrode slurry of the present invention as the electrode slurry, therefore, the prepared battery negative electrode does not stick to rolls in the roll-to-roll process, and the prepared battery negative elec...

Embodiment 1

[0061] This embodiment provides a battery negative electrode and a preparation method thereof. The negative electrode of the battery in this embodiment includes a negative electrode current collector and a negative electrode active layer coated on the surface of the current collector, the negative electrode active layer includes a composite binder, and the binder includes LA133 and the first carboxymethyl cellulose Sodium and second sodium carboxymethylcellulose, the degree of substitution of the first sodium carboxymethylcellulose is 0.95, the degree of substitution of the second sodium carboxymethylcellulose is 0.85, and the first The mass ratio of sodium carboxymethylcellulose to the first sodium carboxymethylcellulose is 1:1.

[0062] The preparation method of the negative electrode of the battery in this embodiment is as follows:

[0063] Step S11. Preparation of the first sodium carboxymethylcellulose glue: select 2.0 parts by weight of CMC with a degree of substitution...

Embodiment 2

[0079] This embodiment provides a battery negative electrode and a preparation method thereof. The negative electrode of the battery in this embodiment includes a negative electrode current collector and a negative electrode active layer coated on the surface of the current collector, the negative electrode active layer includes a composite binder, and the binder includes LA133 and the first carboxymethyl cellulose Sodium and the second sodium carboxymethylcellulose, the degree of substitution of the first sodium carboxymethylcellulose is 0.98, the degree of substitution of the second sodium carboxymethylcellulose is 0.82, and the first The mass ratio of sodium carboxymethylcellulose to the first sodium carboxymethylcellulose is 1:1.

[0080] The preparation method of the negative electrode of the battery in this embodiment is as follows:

[0081] Step S21. Preparation of the first sodium carboxymethylcellulose glue: select 2.0 parts by weight of CMC with a degree of substitu...

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Abstract

The invention provides a battery negative electrode, a preparation method thereof and a lithium ion battery. The battery negative electrode comprises a current collector and a negative electrode active material layer arranged on the surface of the current collector in a coating manner, wherein the negative electrode active material layer comprises negative electrode active materials, conductive agents and an adhesive; the adhesive contains aqueous adhesives, first sodium carboxymethylcellulose and second sodium carboxymethylcellulose; the degree of substitution of first sodium carboxymethylcellulose is 0.95-1.0; the degree of substitution of second sodium carboxymethylcellulose is 0.8-0.85; the mass ratio of first sodium carboxymethylcellulose to second sodium carboxymethylcellulose is (0.5-0.75) to (0.5-0.75). The battery negative electrode has good active layer thickness uniformity, thus endowing the battery negative electrode with excellent comprehensive electrochemical properties.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a battery negative electrode, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in mobile phone and notebook batteries, power batteries and energy storage batteries due to their excellent properties such as high voltage, high energy density and long cycle life. Among them, mobile phone and notebook batteries have been completely occupied by lithium-ion batteries, and other types of batteries cannot meet the stringent requirements of these portable smart devices. With the development of lithium-ion battery technology, its proportion in power battery energy storage batteries is also increasing. From the current development trend, lithium-ion batteries are in a stage of rapid development and have broad application prospects. [0003] Lithium-ion batteries include positive electrodes, negative e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139H01M10/0525
CPCH01M4/139H01M4/62H01M4/621H01M10/0525Y02E60/10
Inventor 王继生孟亚斌於志锋
Owner JIAN UTILITY TECH CO LTD
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