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Lithium-ion battery negative electrode slurry and preparation method thereof, negative electrode sheet and lithium-ion battery

A lithium-ion battery and negative electrode slurry technology, which is applied to battery electrodes, secondary batteries, circuits, etc., can solve the problems of granular coating, difficult filtration, slurry agglomeration, etc., and achieve uniform conductivity and coating Uniform, smooth finish

Active Publication Date: 2020-04-14
DONGGUAN CHUANGMING BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problems such as slurry agglomeration, difficulty in filtration, granular coating and even coating failure in the slurry mixing process of the negative electrode slurry of the lithium ion battery, the invention provides a negative electrode slurry of the lithium ion battery and a preparation method thereof

Method used

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  • Lithium-ion battery negative electrode slurry and preparation method thereof, negative electrode sheet and lithium-ion battery
  • Lithium-ion battery negative electrode slurry and preparation method thereof, negative electrode sheet and lithium-ion battery
  • Lithium-ion battery negative electrode slurry and preparation method thereof, negative electrode sheet and lithium-ion battery

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preparation example Construction

[0045] In one embodiment, the preparation method of the lithium ion battery negative electrode slurry at least includes the following steps:

[0046] Step S01. Weighing the above-mentioned negative electrode active material, conductive agent, binder, thickener, ethylene carbonate, deionized water;

[0047] Step S02. Mixing the weighed ethylene carbonate with part of the deionized water to form a ethylene carbonate solution;

[0048] Step S03. Dry-mixing the weighed negative electrode active material, conductive agent, and thickener to obtain a first mixed material;

[0049] Step S04. Mixing the ethylene carbonate solution and the first mixed material to obtain a first slurry with a solid content of 60% to 70%;

[0050] Step S05. Add the remaining deionized water to the first slurry, stir to adjust the viscosity, add the weighed binder, and continue to stir until the slurry is uniform;

[0051] Step S06. Vacuumize and stir the slurry obtained in step S05 to obtain negative el...

Embodiment 1

[0073] A lithium ion battery negative electrode slurry, including graphite (D90 is about 20 μm), Ketjen black (ECP-300, specific surface area is about 800m 2 / g), SBR, CMC and deionized water, also contains ethylene carbonate;

[0074] In terms of parts by weight of the negative electrode slurry, the parts by weight of the negative electrode slurry formula are as follows:

[0075]

[0076] Specifically, 960 g of graphite, 10 g of Ketjen Black, 10 g of SBR (20 g of emulsion), 20 g of CMC, 1000 g of deionized water, and 30 g of ethylene carbonate.

[0077] The preparation method of the lithium ion battery negative electrode slurry is as follows:

[0078] Step S01. Adding 960g of graphite, 10g of Ketjen black, and 20g of CMC into a stirring tank and stirring for 20min to disperse the solid components evenly to obtain the first mixed material;

[0079] Step S02. 30g ethylene carbonate is mixed with 450g deionized water to form ethylene carbonate solution;

[0080] Step S03. ...

Embodiment 2

[0086] A negative electrode slurry for lithium ion batteries, comprising graphite (D90 is about 20 μm), Super P (specific surface area is about 67m 2 / g), SBR, CMC and deionized water, also contains ethylene carbonate;

[0087] In terms of parts by weight of the negative electrode slurry, the parts by weight of the negative electrode slurry formula are as follows:

[0088]

[0089] Specifically, graphite 960g, Super P 10g, SBR 10g (20g emulsion), CMC 20g, deionized water 1100g and ethylene carbonate 20g.

[0090] The preparation method of the lithium ion battery negative electrode slurry is as follows:

[0091] Step S01. Add 960g of graphite, 10g of Super P, and 20g of CMC into the stirring tank and stir for 20min to disperse the solid components evenly, and obtain the first mixed material;

[0092] Step S02. 20g ethylene carbonate is mixed with 500g deionized water to form ethylene carbonate solution;

[0093] Step S03. Adding the ethylene carbonate solution into the st...

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Abstract

The invention provides lithium ion battery negative pole slurry and a preparation method thereof, a negative pole piece and a lithium ion battery. The lithium ion battery negative pole slurry comprises a negative pole active substance, a conductive agent, adhesive, a thickening agent and deionized water, also comprises ethylene carbonate; based on the weight parts of the negative pole slurry, theformula of the negative pole slurry comprises the following components in parts by weight: 940 to 980 parts of negative active substance, 8 to12 parts of a conductive agent, 8 to 12 parts of an adhesive, 18 to 22 parts of a thickening agent, 20 to 50 parts of ethylene carbonate and 800 to 1200 parts of deionized water. The low-polarity ethylene carbonate is added in the lithium ion battery negative pole slurry, so that the dispersibility of the negative electrode active substance and the conductive agent in the deionized water can be effectively regulated, the components of the slurry are dispersed uniformly, and particle aggregation phenomena are reduced, and even the particle aggregation phenomena are avoided.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode slurry, a preparation method thereof, a negative electrode sheet and a lithium ion battery. Background technique [0002] Lithium batteries are widely used in instrumentation, memory power supply, military, oil drilling and other fields due to their high energy, low self-discharge rate, long storage life and environmental protection. Lithium-ion batteries are composed of positive electrodes, negative electrodes, separators, and battery cases, among which, the positive electrodes and the negative electrodes are formed by coating their respective slurry on the surface of the corresponding current collector through drying and rolling processes. [0003] Generally, the production process of the negative electrode slurry is as follows: firstly, the thickener sodium carboxymethylcellulose (CMC) is dispersed in water, st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/62H01M10/0525
CPCH01M4/133H01M4/62H01M10/0525Y02E60/10
Inventor 韦添运杨俊赵悠曼乔亚非
Owner DONGGUAN CHUANGMING BATTERY TECH
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