Lithium ion battery negative electrode material, lithium ion battery negative electrode plate and preparation method thereof and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of easy detachment of negative electrode active materials and reduced cycle life of lithium ion batteries, and achieves convenient operation and improved Low temperature performance, simple process effect

Inactive Publication Date: 2018-06-15
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of negative pole material of lithium-ion battery, to alleviate traditional lithium-ion battery negative pole material to adopt styrene-butadiene rubber and sodium carboxymethyl cellulose as binding agent, binding agent exists swelling in electrolytic solution, causes The technical problem that the negative electrode active material is easy to fall off, and the cycle life of the lithium-ion battery is reduced

Method used

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  • Lithium ion battery negative electrode material, lithium ion battery negative electrode plate and preparation method thereof and lithium ion battery
  • Lithium ion battery negative electrode material, lithium ion battery negative electrode plate and preparation method thereof and lithium ion battery

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preparation example Construction

[0063] According to a third aspect of the present invention, the present invention provides a method for preparing the above-mentioned lithium-ion battery negative plate, comprising the steps of:

[0064] (a) dispersing the lithium-ion battery negative electrode material in water to prepare the lithium-ion battery negative electrode slurry;

[0065] (b) Coating the negative electrode slurry of the lithium ion battery on the current collector, followed by drying and rolling to obtain the negative electrode sheet of the lithium ion battery.

[0066] The preparation method of the lithium ion battery negative plate provided by the present invention adopts cheap and pollution-free water as a solvent, and adopts an adhesive including a polyacrylamide adhesive as an adhesive, which reduces environmental pollution, saves energy, and at the same time The process is simple, the operation is convenient, and it can be applied to large-scale industrial production.

[0067] In a preferred ...

Embodiment 1

[0074] This embodiment provides a lithium-ion battery, including a lithium-ion battery positive electrode sheet and a lithium-ion battery negative electrode sheet, the lithium-ion battery negative electrode sheet is prepared by coating a lithium-ion battery negative electrode material on a copper foil, and the lithium-ion battery negative electrode sheet The material is prepared from the following raw materials: artificial graphite: 97wt%, polyacrylamide binder: 1wt%, LA132: 0.5wt% and carbon black: 1.5wt%; wherein, the polyacrylamide binder is acrylamide - Vinyl alcohol-n-butyl acrylate block copolymer, the number average molecular weight is 1 million, and the proportion of the polymer block of the acrylamide monomer unit is 50wt%, and the proportion of the polymer block of the vinyl alcohol monomer unit is 20wt% %, n-butyl acrylate monomer unit polymer block accounts for 30wt%.

[0075] The preparation steps of lithium ion battery negative plate are as follows:

[0076] (a)...

Embodiment 2

[0080] This embodiment provides a lithium-ion battery, including a lithium-ion battery positive electrode sheet and a lithium-ion battery negative electrode sheet, the lithium-ion battery negative electrode sheet is prepared by coating a lithium-ion battery negative electrode material on a copper foil, and the lithium-ion battery negative electrode sheet The material is prepared from the following raw materials: lithium titanate: 96.5wt%, polyacrylamide binder: 2.5wt%, carbon black: 1wt%; among them, the polyacrylamide binder is acrylamide-vinyl alcohol- N-hexyl acrylate block copolymer, the number average molecular weight is 22 million, and the proportion of polymer block of acrylamide monomer unit is 80wt%, the proportion of polymer block of vinyl alcohol monomer unit is 10wt%, n-butyl acrylate The ester monomer unit polymer block accounts for 10wt%.

[0081] The preparation steps of lithium ion battery negative plate are as follows:

[0082] (a) adding the negative electro...

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Abstract

The invention provides a lithium ion battery negative electrode material, a lithium ion battery negative electrode plate and a preparation method thereof and a lithium ion battery, and relates to thetechnical field of an electrode material. The lithium ion battery negative electrode material comprises a negative electrode active material, a binder and a conductive agent; the binder comprises a polyacrylamide type binder; the technical problem of relatively short cycle life caused by the fact that the conventional lithium ion battery negative electrode material adopts styrene-butadiene rubberand sodium carboxymethylcellulose as the binder can be relieved; and the binder comprising the polyacrylamide type binder is adopted to replace styrene-butadiene rubber and sodium carboxymethylcellulose to be used as the binder, so that a swelling phenomenon in an electrolyte is avoided, the low-temperature performance is improved, and a technical effect of prolonging the cycle life of the lithiumion battery can be achieved.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation methods, in particular to a lithium ion battery negative electrode material, a lithium ion battery negative electrode sheet, a preparation method thereof, and a lithium ion battery. Background technique [0002] Since the large-scale production of lithium-ion batteries was realized in the 1990s, they have been widely used in various fields due to their high volume-to-energy ratio, high weight-to-energy ratio, high voltage, low discharge rate, no memory effect, and long cycle life. [0003] Traditional lithium-ion battery negative electrode materials use styrene-butadiene rubber and sodium carboxymethyl cellulose as binders. Due to the swelling phenomenon of the above-mentioned binders in the electrolyte, the swelled styrene-butadiene rubber is bound to the negative electrode active material. When the lithium-ion battery is cycled, the negative electrode active material is ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/139H01M10/0525
CPCH01M4/13H01M4/139H01M4/622H01M10/0525Y02E60/10
Inventor 崔燕陈家辉薛建军
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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