公开(公告)号：US10923761B2

公开(公告)日：2021-02-16

申请号：US16272917

申请日：2019-02-11

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Jiao Cao ,  Qifan Zou ,  Guangbo Lu ,  Shengwei Wang ,  Wenzhu Xu

IPC: H01M4/00 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  H01M4/583 ,  H01M4/02

Abstract: The present disclosure provides a lithium-ion battery, and the lithium-ion battery comprises a positive electrode plate, a negative electrode plate, a separator and an electrolyte. The positive active material comprises a material with a chemical formula of LiaNixCoyM1-x-yO2, the negative active material comprises graphite, the OI value of the positive film represented by OIc and the OI value of the negative film represented by OIa satisfy a relationship: 0.05≤OIa/OIc≤10. By reasonably matching the OI value of the positive film represented by OIc and the OI value of the negative film represented by OIa and making OIa/OIc between 0.05 and 10, the dynamics performance of the positive electrode plate and the dynamics performance of the negative electrode plate can achieve an optimal match, the lithium-ion battery can have higher charging capability, and also have excellent cycle life and excellent safety performance during the long-term fast charging use.

公开(公告)号：US11050052B2

公开(公告)日：2021-06-29

申请号：US16432958

申请日：2019-06-06

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wenzhu Xu ,  Jianqing Sun ,  Guangbo Lu ,  Fan Sun ,  Qifan Zou ,  Shengwei Wang

IPC: H01M4/36 ,  H01M4/587 ,  H01M10/0525 ,  H01M4/485 ,  H01M4/58 ,  H01M4/131 ,  H01M4/505 ,  H01M4/525 ,  H01M4/1393 ,  H01M4/62 ,  H01M4/02

Abstract: The present invention provides a lithium ion battery and a negative electrode material thereof. The negative electrode material includes a mixture of a graphite and an amorphous carbon, wherein the graphite is subjected to a surface treatment, and the surface treatment manner is a combination of mechanical fusion modification and spray drying coating, and wherein the graphite has a graphitization degree of 90-96%, an average particle diameter D50 of 13-25 μm and a specific surface area BET of 0.8-2.5 m2/g, and the amorphous carbon has a graphitization degree of 65-80%, an average particle diameter D50 of 2-15 μm and a specific surface area BET of 1.0-3.0 m2/g.

公开(公告)号：US20190288279A1

公开(公告)日：2019-09-19

申请号：US16432958

申请日：2019-06-06

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Wenzhu Xu ,  Jianqing Sun ,  Guangbo Lu ,  Fan Sun ,  Qifan Zou ,  Shengwei Wang

IPC: H01M4/36 ,  H01M10/0525 ,  H01M4/587

Abstract: The present invention provides a lithium ion battery and a negative electrode material thereof. The negative electrode material includes a graphite and an amorphous carbon, wherein the graphite has a graphitization degree of 90˜96% and an average particle diameter D50 of 2˜25 μm, and the amorphous carbon has a graphitization degree of 65˜80% and an average particle diameter D50 of 2˜25 μm. Compared with the prior art, by mixing graphite having a small particle diameter with amorphous carbon, the negative electrode material of the present invention has excellent dynamic performance, cycle performance and storage performance. The present invention also provides a lithium ion battery.