Lithium ion battery anode material, lithium ion battery anode piece as well as preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and cathode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the high cost of N-methylpyrrolidone, increase the production cost of lithium-ion batteries, and damage the health of workers and other issues, to achieve the effect of reducing processing costs, eliminating hidden dangers to human health, and reducing preparation costs

Inactive Publication Date: 2018-06-12
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 purpose of the present invention is to provide a lithium-ion battery positive electrode material to relieve the traditional lithium-ion battery positive electrode sheet in the process of pulping, using N-methylpyrrolidone as a solvent, which not only causes surrounding environmental pollution, but also damages workers. The health of the body, while the cost of N-methylpyrrolidone is relatively high, it will also increase the technical problems of the production cost of lithium-ion batteries

Method used

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  • Lithium ion battery anode material, lithium ion battery anode piece as well as preparation method thereof and lithium ion battery
  • Lithium ion battery anode material, lithium ion battery anode piece as well as preparation method thereof and lithium ion battery

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preparation example Construction

[0065] According to a third aspect of the present invention, the present invention provides a method for preparing the positive electrode sheet of the above-mentioned lithium ion battery, comprising the steps of:

[0066] (a) adding the positive electrode material of the lithium ion battery into water and dispersing evenly to prepare the positive electrode slurry of the lithium ion battery;

[0067] (b) Coating the positive electrode slurry of the lithium ion battery on the current collector, followed by drying and rolling to obtain the positive electrode sheet of the lithium ion battery.

[0068] The preparation method of the lithium-ion battery positive plate provided by the invention uses cheap and pollution-free water instead of N-methylpyrrolidone as a solvent, which reduces environmental pollution, eliminates hidden dangers to human health, saves energy, and reduces the processing cost of lithium-ion batteries .

[0069] According to the fourth aspect of the present inv...

Embodiment 1

[0073] 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 positive electrode sheet is prepared by coating the lithium-ion battery positive electrode sheet on an aluminum foil, and the lithium-ion battery positive electrode material It is prepared from the following raw materials: nickel cobalt lithium manganate: 95.0wt%, polyacrylamide binder: 2.5wt% and acetylene black: 2.5wt%; among them, the polyacrylamide binder is acrylamide-ethylene 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%, acrylic acid The n-butyl monomer unit polymer block accounts for 10 wt%.

[0074] The preparation steps of lithium-ion battery cathode sheet are as follows:

[0075] (a) adding th...

Embodiment 2

[0079] 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 positive electrode sheet is prepared by coating a lithium-ion battery positive electrode material on a copper foil, and its lithium-ion battery positive electrode The material is prepared from the following raw materials: nickel cobalt lithium manganate: 70wt%, lithium manganate: 26wt%, polyacrylamide adhesive: 0.6wt%, LA132: 0.9wt%, acetylene black: 1.5wt%, conductive Graphite (KS6): 1wt%; Among them, the polyacrylamide binder is acrylamide-vinyl alcohol-n-butyl acrylate block copolymer, the number average molecular weight is 1 million, and the polymer block of acrylamide monomer unit The proportion of vinyl alcohol monomer unit polymer block is 50wt%, the proportion of vinyl alcohol monomer unit polymer block is 20wt%, and the proportion of n-butyl acrylate monomer unit polymer block is 30wt...

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Abstract

The invention provides a lithium ion battery anode material, a lithium ion battery anode piece as well as a preparation method thereof and a lithium ion battery, which relates to the technical field of electrode material preparation methods. The lithium ion battery anode material comprises an anode active substance, a conducting agent and a binder, wherein the binder at least comprises a polyacrylamide binder; and the technical problem of the traditional lithium ion battery anode piece that in the process of slurry preparation, the use of the N-methyl pyrrolidone as a solvent pollutes the peripheral environment and harms the body health of working personnel, and the production cost can be increased can be solved, and the technical effects that the environmental pollution in the slurry preparation process can be reduced, the health potential hazard of a human body can be eliminated, the energy can be saved, and the processing cost of the lithium ion battery can be decreased can be achieved by adopting the binder at least comprising the polyacrylamide binder to substitute polyvinylidene chloride and using the water as the solvent in the slurry preparation process.

Description

technical field [0001] The invention relates to the technical field of electrode material preparation methods, in particular to a lithium-ion battery cathode material, a lithium-ion battery cathode 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] The traditional lithium-ion battery positive electrode material uses polyvinylidene chloride as a binder. In the process of preparing positive electrode slurry, polyvinylidene chloride is first dissolved in N-methylpyrrolidone, and then mixed with positive electrode active material and conductive agent. Wait for the material to mix evenly, and finally coat it on the surface of the aluminum foil. However, due t...

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 陈家辉崔燕薛建军
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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