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Binder composition for lithium ion battery, and preparation method thereof

A lithium-ion battery and composition technology, which is applied in the directions of polymer binder additives, non-polymer binder additives, non-polymer organic compound binders, etc. Insufficient flexibility, affecting battery life and safety performance, etc., to achieve the effect of improving safety, high solid cracking residual rate, and inhibiting heat release process

Active Publication Date: 2021-07-27
山东航橡新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] A: The modulus is large, resulting in insufficient flexibility of the pole piece;
[0007] B: easy to be swelled by the electrolyte, resulting in poor adhesion of the active material on the current collector;
[0008] C: It is easy to form lithium carbide with metal lithium, which affects the service life and safety performance of the battery;
[0009] D Poor electronic and ionic conductivity;

Method used

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  • Binder composition for lithium ion battery, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: All solid raw materials should be dried in an oven at 80°C for 12h before use. Weigh 90g of PVDF (polyvinylidene fluoride) material and add it to the rheometer blending chamber with a set temperature of 190°C and a rotation speed of 60r / min. After the PVDF is completely melted, 0.5g of methyl methacrylate and polypropylene maleate are added in turn. Acid anhydride graft copolymer (PP-g-MAH) and 0.3g Solsperse27000, after 10 minutes, the temperature was increased to 200°C, 10g trifluoropropyl methyl polysiloxane was added, blended for 5 minutes, and then 2g phenoxy was added Cyclophosphazene was continuously blended for 10 minutes, then taken out from the blending chamber, cooled and crushed at room temperature, and dried in an oven at 80°C for 12 hours to complete the preparation.

Embodiment 2

[0037] Example 2: All solid raw materials should be dried in an oven at 80°C for 12h before use. Weigh 80g of PVDF (polyvinylidene fluoride) material and add it to the rheometer blending chamber with a set temperature of 190°C and a rotation speed of 60r / min. After the PVDF is completely melted, add 0.5g of methyl methacrylate and methacrylic acid in turn. Glycerol ester copolymer MMA-co-GMA and 0.4g EFKA5244, after 10 minutes, the temperature was increased to 200°C, 20g trifluoroethoxy polyphosphazene was added, blended for 5 minutes, and then 1g phenoxycyclophosphazene was added , Continue to blend for 10 minutes, then take out from the blending chamber, cool and crush at room temperature, and then dry in an oven at 80°C for 12 hours to complete the preparation.

Embodiment 3

[0038] Example 3: All solid raw materials should be dried in an oven at 80°C for 12h before use. Weigh 80g of PVDF (polyvinylidene fluoride) material and add it to the rheometer blending chamber with a set temperature of 190°C and a rotation speed of 60r / min. After the PVDF is completely melted, add 0.5g of methyl methacrylate and polypropylene maleate in turn. Acid anhydride graft copolymer (PP-g-MAH) and 0.3g Solsperse28000, after 10 minutes, the temperature was increased to 200°C, 20g phenoxy polyphosphazene was added, blended for 5 minutes, and then 1g hexamethoxycyclotriphosphazene was added , Continue to blend for 10 minutes, then take out from the blending chamber, cool and crush at room temperature, and then dry in an oven at 80°C for 12 hours to complete the preparation.

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Abstract

The invention discloses a binder composition for a lithium ion battery, and a preparation method thereof, and belongs to the technical field of binders. A polymer component with good main chain structure flexibility and a blending compatilizer are introduced into a conventional binder material for blending, so that the problems of insufficient flexibility and insufficient flame diffusion prevention capability of a PVDF binder material are effectively solved.

Description

technical field [0001] The invention relates to a binder for lithium ion batteries and a preparation method thereof. By introducing a polymer component with good flexibility of the main chain structure into the conventional binder PVDF material for blending, the problems of insufficient flexibility of the PVDF binder material and insufficient ability to prevent flame diffusion are effectively solved. It belongs to the technical field of adhesives. Background technique [0002] The binder is one of the important constituent materials of lithium-ion batteries, which has the following functions: ensuring the uniformity and safety of the active material during pulping; bonding the active material particles; bonding the active material to the current collector; It maintains the bonding between active materials and current collectors; it is an additional material with high technical content in lithium-ion battery materials. [0003] Although the amount of binder in the electrode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J4/06C09J4/02C09J127/16C09J11/06C09J11/08H01M4/62H01M10/0525
CPCC09J4/06C09J127/16C09J11/06C09J11/08H01M4/623H01M10/0525C08L33/068C08L85/02C08K5/5399C08L51/06C08L27/16Y02E60/10
Inventor 林红吉马翰林
Owner 山东航橡新材料有限公司
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