公开(公告)号：US20210234199A1

公开(公告)日：2021-07-29

申请号：US17051086

申请日：2019-05-02

Applicant: SOLVAY SA

Inventor： Ji-Hye WON ,  Moon-Hyung CHOI ,  Mi-Soon OH ,  Hyun-Cheol LEE ,  Lawrence Alan HOUGH ,  Hae-Young KIM

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

Abstract: This invention relates to a non-aqueous liquid electrolyte composition suitable for secondary battery cells, especially lithium-ion secondary battery cells. Such electrolyte composition comprises a) at least one non-fluorinated cyclic carbonate and at least one fluorinated cyclic carbonate, b) at least one fluorinated acyclic carboxylic acid ester, c) at least one electrolyte salt, d) at least one lithium borate compound, e) at least one cyclic sulfur compound, and f) optionally at least one cyclic carboxylic acid anhydride, all components being present in specific proportions. It can advantageously be used in batteries comprising a cathode material comprising a lithium nickel manganese cobalt oxide (NMC) or a lithium cobalt oxide (LCO), especially at a high operating voltage.