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A carboxymethylcellulose-based binder and its application in lithium batteries

A technology of carboxymethyl cellulose and sodium carboxymethyl cellulose, used in battery electrodes, secondary batteries, circuits, etc., can solve the problems of affecting the softness of the pole piece, increasing the surface defects of the pole piece, etc. The effect of preventing sticking and improving miscibility

Active Publication Date: 2021-03-30
眉山晶瑞电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when sodium carboxymethylcellulose in the prior art is mixed with various components, there are larger particles in the mixing system, which will affect the softness of the pole piece and increase the surface defects of the pole piece.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Ingredients: 30 parts of sodium carboxymethylcellulose, 10 parts of modified SBR, 1 part of tea saponin, 1 part of thickener and 5 parts of dilution aid;

[0047] (2) Infiltrate the dilution aid into sodium carboxymethyl cellulose and keep it for at least 30 minutes to obtain a premix;

[0048] (3) Then add modified SBR and tea saponin to the premix, and stir at high speed for 2~3h;

[0049] (4) Continue to add thickener and stir for 0.5~1h.

Embodiment 2

[0051] (1) Ingredients: 32 parts of sodium carboxymethylcellulose, 12 parts of modified SBR, 2 parts of tea saponin, 2 parts of thickener and 6 parts of dilution aid;

[0052] (2) Infiltrate the dilution aid into sodium carboxymethyl cellulose and keep it for at least 30 minutes to obtain a premix;

[0053] (3) Then add modified SBR and tea saponin to the premix, and stir at high speed for 2~3h;

[0054] (4) Continue to add thickener and stir for 0.5~1h.

Embodiment 3

[0056] (1) Ingredients: 34 parts of sodium carboxymethylcellulose, 14 parts of modified SBR, 3 parts of tea saponin, 3 parts of thickener and 7 parts of dilution aid;

[0057] (2) Infiltrate the dilution aid into sodium carboxymethyl cellulose and keep it for at least 30 minutes to obtain a premix;

[0058] (3) Then add modified SBR and tea saponin to the premix, and stir at high speed for 2~3h;

[0059] (4) Continue to add thickener and stir for 0.5~1h.

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PUM

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Abstract

The invention relate to a carboxyl methylcellulose-based binding agent. The carboxyl methylcellulose-based binding agent comprises the following constituents based on parts by weight: 30-40 parts of sodium carboxyl methylcellulose, 10-20 parts of modified SBR, 1-5 parts of tea saponin, 1-5 parts of thickening agent and 5-10 parts of dilution additive. The binding agent prepared by the method is finer in grain size and has favorable intersolubility with each constituent, so that the surface defect of a pole plate is almost zero, the flexibility of a binding agent system also can be improved, and the problem of pole plate split is solved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a carboxymethyl cellulose-based binder and its application in lithium batteries. Background technique [0002] In recent years, with the further implementation and promotion of the national new energy policy, the new energy automobile industry has achieved considerable development. However, the market demand for battery products with high energy density and high specific power is becoming more and more urgent. The development of high specific energy, low-cost lithium-ion electrode materials and related auxiliary materials is becoming the research and development focus of major battery manufacturers and material suppliers. Under the development trend of high energy density, the positive and negative electrode materials, diaphragm, electrolyte and other material systems of current lithium-ion power batteries are constantly being upgraded. In addition to these main raw m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 邱磊周振文朱生文
Owner 眉山晶瑞电子材料有限公司