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Method for preparing lithium ion battery negative pole piece

A lithium-ion battery and negative electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of time-consuming, increase equipment investment and energy consumption, affect production efficiency, etc., achieve a wide range of applications and save equipment investment. and energy consumption, the effect of improving production efficiency

Active Publication Date: 2017-06-13
ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods all have the following disadvantages: in the first method, because the binder and other materials are added together, it is easy to agglomerate, thereby affecting the uniformity of the negative electrode sheet; in the second method, the preparation of the colloid takes a lot of time , while occupying storage equipment, which increases equipment investment and energy consumption, and also affects production efficiency

Method used

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  • Method for preparing lithium ion battery negative pole piece
  • Method for preparing lithium ion battery negative pole piece
  • Method for preparing lithium ion battery negative pole piece

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preparation example Construction

[0034] The invention provides a preparation method of a negative electrode sheet of a lithium ion battery. The preparation method comprises the following steps:

[0035] S1, dry mixing the negative electrode active material and the conductive agent to obtain a dry blend;

[0036] S2, adding negative electrode additives, thickeners and a first solvent to the dry mixture to obtain a first mixture;

[0037] S3, adding a binder and a second solvent to the first mixture to obtain a second mixture;

[0038] S4, adding a third solvent to the second mixture to obtain a prefabricated slurry, and coating the prefabricated slurry to obtain a lithium ion battery negative electrode sheet.

[0039] Wherein, the negative electrode additive is a polyether-modified silicone oil, and the general chemical formula of the polyether-modified silicone oil is:

[0040]

[0041] Wherein, x is an integer of 2 to 8, m is an integer of 5 to 8, n is an integer of 5 to 8, R 1 , R 2 , R 3 C for hyd...

Embodiment 1

[0050] 93g of negative electrode active material and 1.5g of conductive agent were dry mixed to obtain a dry blend, wherein the negative electrode active material was artificial graphite, and the conductive agent was Super P.

[0051] Add 2g of negative electrode additive, 2g of CMC and 45g of water to the dry mixture to obtain the first mixture, wherein the negative electrode additive is silicone oil co-modified by allyl group containing epoxy group and polyether.

[0052] 1.5 g of binder and 35 g of water were added to the first mixture to obtain a second mixture in which the binder was .

[0053] 40 g of water was added to the second mixture to obtain a prefabricated slurry, and the prefabricated slurry was coated to obtain a lithium ion battery negative electrode sheet.

Embodiment 2

[0055] 95.5 g of the negative electrode active material and 0.5 g of the conductive agent were dry mixed to obtain a dry mixture, wherein the negative electrode active material was graphite, and the conductive agent was carbon nanotubes.

[0056] 2 g of negative electrode additive and 35 g of NMP were added to the dry mixture to obtain a first mixture, wherein the negative electrode additive was lithiated polyether-modified silicone oil.

[0057] 2 g of binder and 35 g of NMP were added to the first mixture to obtain a second mixture in which the binder was PVDF.

[0058] 50 g of NMP was added to the second mixture to obtain a prefabricated slurry, and the prefabricated slurry was coated to obtain a lithium ion battery negative electrode sheet.

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Abstract

The invention relates to a method for preparing a lithium ion battery negative pole piece. The method comprises the following steps: (1) performing dry mixing on a negative active material and a conductive agent so as to obtain a dry mixture; (2) adding a negative additive, a thickening agent and a first solvent into the dry mixture so as to obtain a first mixture; (3) adding an adhesive and a second solvent into the first mixture so as to obtain a second mixture; and (4) adding a third solvent into the second mixture so as to obtain precast pulp, coating the precast pulp, thereby obtaining the lithium ion battery negative pole piece, wherein the negative additive is polyether-modified organic silicone oil. Due to the added polyether-modified organic silicone oil, bubbles can be effectively removed, and an emulsifying effect is achieved, so that the uniform lithium ion battery negative pole piece can be obtained, and the safety of a lithium ion battery is further improved. Colloid does not need to be prepared in advance in the preparation method, the whole pulping process can be completed in the same equipment, the production efficiency is high, and the cost is low.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for preparing a lithium ion battery negative electrode sheet. Background technique [0002] Lithium-ion battery is a new generation of green and environment-friendly power supply, which has the advantages of high energy density, high voltage, small self-discharge, and no memory effect. Therefore, it is widely used in mobile phones, cameras, notebook computers, power tools, electric bicycles and electric vehicles, etc. product. With the development of power lithium-ion batteries, higher requirements are placed on the uniformity and self-discharge level of the battery. Whether the slurry is uniform and stable directly affects the coating quality of the pole piece, thereby affecting the final performance of the battery. [0003] Lithium-ion battery anode materials are mainly divided into the following three types: embedded anode materials, alloyed anode materials and c...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCH01M4/139Y02E60/10
Inventor 毛玉琴韩珽
Owner ZHEJIANG MEIDARUI NEW MATERIAL TECH CO LTD
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