Application of ethylene maleic anhydride alternating copolymer and hydrolysate thereof in preparation of silicon negative electrode material

A technology of alternating copolymer and maleic anhydride, used in battery electrodes, circuits, electrical components, etc., can solve the problems of poor performance and volume change of silicon anode electrode materials, and achieve easy control of electrode structure and performance, increase content, and improve The effect of cycle performance

Active Publication Date: 2022-01-04
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to solve the problem of rapid volume change in the charging and discharging process of the silicon negative electrode material and the poor performance of the silicon negative electrode material prepared by the existing binder, and provide ethylene maleic anhydride alternating copolymer and its hydrolyzate in the preparation of silicon Applications in negative electrode materials

Method used

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  • Application of ethylene maleic anhydride alternating copolymer and hydrolysate thereof in preparation of silicon negative electrode material
  • Application of ethylene maleic anhydride alternating copolymer and hydrolysate thereof in preparation of silicon negative electrode material
  • Application of ethylene maleic anhydride alternating copolymer and hydrolysate thereof in preparation of silicon negative electrode material

Examples

Experimental program
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Effect test

Embodiment 1

[0049] This embodiment provides an ethylene maleic anhydride alternating copolymer / silicon powder / conductive carbon black negative electrode.

[0050] Put silicon powder: conductive carbon black at a mass ratio of 6:2 into a ball mill jar, and use a ball mill to mill at a speed of 450rp for 30 minutes to obtain a silicon powder / conductive carbon black composite material. 20 parts of ethylene maleic anhydride alternating copolymer (Sigma-Aldrich, M w =100000~500000, CAS: 9006-26-2) was dissolved in 200 parts of N-methylpyrrolidone, 80 parts of silicon powder / conductive carbon black composite material was added, and fully stirred to obtain a silicon-based composite slurry. The composite slurry was coated on copper foil, dried in vacuum at 80° C. for 24 h, and sliced ​​into silicon negative electrodes.

[0051] The structure of the ethylene maleic anhydride alternating copolymer in embodiment 1 is as figure 1 (a) shown.

[0052] Thermo Nicolet Nexus 670 infrared spectrometer w...

Embodiment 2

[0055] This embodiment provides ethylene maleic acid alternating copolymer and a negative electrode of ethylene maleic acid alternating copolymer / silicon powder / conductive carbon black.

[0056] Add 1g of ethylene-maleic anhydride alternating copolymer and 100mL of ultrapure water in a 250mL flask, heat and stir in a water bath at 80°C; after 3 hours of reaction, the mixed solution becomes clear and transparent, and the maleic anhydride alternating copolymer is obtained by drying and removing water. The hydrolysis product of the copolymer, that is, ethylene-maleic acid alternating copolymer.

[0057] Dissolve the above 20 parts of ethylene-maleic acid alternating copolymer in 200 parts of ultrapure water, then add 80 parts of the silicon powder / conductive carbon black composite material prepared in Example 1, and stir thoroughly to obtain a silicon-based composite slurry. The composite slurry was coated on copper foil, dried in vacuum at 80° C. for 24 h, and sliced ​​into sili...

Embodiment 3

[0063] This embodiment provides a flexible self-supporting ethylene maleic anhydride alternating copolymer / nano silicon powder / carbon nanotube negative electrode.

[0064] Dissolve 20 parts of ethylene maleic anhydride alternating copolymers in Example 1 in 750 parts of N-methylpyrrolidone, add 20 parts of single-walled carbon nanotubes and 60 parts of nano silicon powder under ultrasonic stirring conditions, and mix thoroughly to obtain Homogeneous ethylene maleic anhydride alternating copolymer / nano silicon powder / carbon nanotube composite material, poured into a glass mold, and after the organic solvent evaporates, a specific shape of ethylene maleic anhydride alternating copolymer / nano silicon powder / A carbon nanotube composite electrode material, which can be cut to obtain a negative electrode.

[0065] The ethylene maleic anhydride alternating copolymer, nanometer silicon powder and carbon nanotubes in the composite electrode material form a three-dimensional ternary co...

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Abstract

The invention relates to an application of an ethylene maleic anhydride alternating copolymer and a hydrolysate thereof in preparation of a silicon negative electrode material. The ethylene maleic anhydride alternating copolymer and the hydrolysate thereof have a structure as shown in a formula (I) or a formula (II), wherein n is 800-4000. The ethylene-maleic anhydride alternating copolymer and the hydrolyzate thereof are applied to the preparation of the silicon negative electrode material as a binder, so that the rapid change of the volume of the silicon negative electrode material in the charging and discharging process can be effectively inhibited, and the cycle performance of the silicon negative electrode material is effectively improved. In addition, the ethylene-maleic anhydride alternating copolymer and the hydrolysate thereof are used as the binder, so that the charging specific capacity of the electrode material can be improved.

Description

technical field [0001] The invention relates to the technical field of functional polymer materials, in particular to the application of ethylene maleic anhydride alternating copolymer and its hydrolyzate in the preparation of silicon negative electrode materials. Background technique [0002] As an important energy storage device, lithium-ion batteries are widely used in all aspects of today's society. As the core component of lithium-ion batteries, electrode materials are the key factors for the development of high-performance lithium-ion batteries. Traditional negative electrode materials use graphite as the active component of the electrode, but due to its low specific capacity (372mAh / g), it can no longer meet the growing demand for negative electrode materials. As a new type of negative electrode active ingredient, silicon has a very high specific capacity (4200mAh / g, which is ten times that of graphite) and is rich in sources (the second most element in the earth's c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/02C08F222/06C08F8/12H01M4/134H01M4/62H01M10/0525
CPCC08F210/02C08F222/06C08F8/12H01M4/622H01M4/134H01M10/0525Y02E60/10
Inventor 章自寿陈耀光麦堪成朱旭恒李富镇
Owner SUN YAT SEN UNIV
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