Granted Patent B2

US 12,497,298 · App. 17/942,080 · Granted Dec 16, 2025

Inventors: Zilong Song (Ningde, CN); Rui Shen (Ningde, CN); Libing He (Ningde, CN)

Assignee: CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

C01B32/205H01M4/133H01M4/587H01M10/052H01M10/0525H01M2004/027

Abstract

Claims (15)

1 . A method for preparing a modified graphite, comprising:

performing crushing on coal-based needle coke to obtain a first material;

performing shaping fine powder removal on the first material to obtain a second material;

performing heat treatment on the second material in a reaction kettle and then cooling the second material after the heat treatment to room temperature to obtain a third material; and

performing graphitization on the third material in a graphitization furnace and then cooling the third material after the graphitization to room temperature to obtain the modified graphite;

wherein:

the coal-based needle coke comprises, in mass percentages, a volatile matter content of 5-9%, a sulfur content of less than or equal to 0.2%, an ash content of less than or equal to 0.2%, and a quinoline-insoluble matter content of less than or equal to 0.2%; and

the coal-based needle coke has a true density of 1.35-1.48 g/cm 3 .

2 . The method according to claim 1 , wherein the heat treatment is performed at a temperature of 400-800° C. for 2-8 hours.

3 . The method according to claim 1 , wherein the heat treatment is performed at a temperature increase rate of 1-15° C./min.

4 . The method according to claim 1 , wherein the graphitization is performed at a temperature of 2500-3200° C. for 55-65 hours.

5 . The method according to claim 1 , wherein Dv50 and Dn10 of the second material satisfy:

Dv50=5-12 μm; and

5 μm≥Dn10≥1.5 μm.

6 . The method according to claim 1 , wherein Dv50 of the first material satisfies: Dv50=3-12 μm.

Assignments (3)

Continuity (2)

References Cited (19)