公开(公告)号：US20190036156A1

公开(公告)日：2019-01-31

申请号：US16073237

申请日：2017-01-17

Applicant: BYD COMPANY LIMITED

Inventor： Feiyan QIAO ,  Sheng WANG

IPC: H01M10/0525 ,  H01M4/131 ,  H01M10/0567 ,  H01M10/0569

Abstract: An electrolyte solution, a positive electrode, and a lithium-ion battery containing the electrolyte solution and/or the positive electrode are provided. The electrolyte solution comprises a lithium salt, an electrolyte solvent, and an additive, wherein the additive is an aniline compound having a structure of Formula 1 or a derivative thereof: in which R1 and R2 are each independently selected from at least one of —H, —(CH2)n1CH3, and —(CH2)n2CF3, where 0≤n2≤3, and 0≤n2≤3; and M1-M5 are each independently selected from at least one of —H, —F, —Cl, —Br, —(CH2)n3CH3, and R3—S—R4, where 0≤n3≤3, and at least one of M1-M5 is selected from a thioether group R3—S—R4, where R3 is selected from —(CH2)n4—, in which 0≤n4≤1, and R4 is selected from one or two of an aniline group or —(CH2)n5CF3, where 0≤n5≤3. By adopting the aniline compound having a structure of Formula 1 or a derivative thereof as a specific additive in the present invention, the positive electrode is protected from being damaged, and the electrolyte solvent is protected from being oxidized and decomposed at a high voltage, thereby increasing the service life of a battery at a high voltage.

公开(公告)号：US20230122863A1

公开(公告)日：2023-04-20

申请号：US18069640

申请日：2022-12-21

Applicant: BYD COMPANY LIMITED

Inventor： Feiyan QIAO ,  Ping LU ,  Haijun WANG ,  Rong HAO ,  Yi PAN

IPC: H01M10/0567 ,  H01M10/0569 ,  H01M10/0568 ,  H01M10/0525

Abstract: The present disclosure relates to an electrolyte solution for a lithium-ion battery. The electrolyte solution includes an organic solvent, a lithium salt, and an additive. The electrolyte solution provided in the present disclosure includes a 6-membered heterocyclyl carboxylic anhydride additive, and can effectively inhibit gas production and the increase of interface impedance in the battery, improve the high-temperature stability of the battery, and prolong the service life of the battery.