MODIFIED GRAPHENE NEGATIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR, NEGATIVE ELECTRODE SHEET, AND BATTERY - GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD

Title:

MODIFIED GRAPHENE NEGATIVE ELECTRODE MATERIAL AND PREPARATION METHOD THEREFOR, NEGATIVE ELECTRODE SHEET, AND BATTERY

Document Type and Number:

WIPO Patent Application WO/2024/082540

Kind Code:

A1

Abstract:

The present invention relates to the technical field of batteries. Disclosed are a modified graphene negative electrode material and a preparation method therefor, a negative electrode sheet, and a battery. The method comprises: mixing and stirring modified graphene obtained by performing esterification modification on carboxylated graphene, polyvinylpyrrolidone, and tetrahydrofuran to obtain a homogeneous solution; and adding glacial acetic acid to adjust the pH of the homogeneous solution to be weakly acidic, gradually adding a mixed solution of titanate and absolute ethanol to form a gelation system, and by using a non-solvent induced phase separation method, separating out a porous graphene precipitate having titanium dioxide deposited in a porous structure. According to the method, the porous graphene precipitate having titanium dioxide deposited in the porous structure can be separated out by using the non-solvent induced phase separation method, so that the structure and performance stability of the material can be ensured, the specific capacity of the electrode material can be improved, and the electrochemical performance and the rate capability of the electrode material can also be improved.

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Inventors:

XIE YINGHAO (CN)
LI AIXIA (CN)
YU HAIJUN (CN)
ZHANG XUEMEI (CN)
LI CHANGDONG (CN)

Application Number:

PCT/CN2023/082869

Publication Date:

April 25, 2024

Filing Date:

March 21, 2023

Export Citation:

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Assignee:

GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)

International Classes:

H01M4/62; H01M4/133; H01M4/587; H01M10/0525

Foreign References:

CN115602845A	2023-01-13
CN104368324A	2015-02-25
CN109337086A	2019-02-15
CN108183218A	2018-06-19
CN104211053A	2014-12-17
US20140139973A1	2014-05-22

Attorney, Agent or Firm:

JIAQUAN IP LAW (CN)

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