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    LIQUID ELECTROLYTE FOR LITHIUM SECONDARY BATTERIES
    4.
    发明公开
    LIQUID ELECTROLYTE FOR LITHIUM SECONDARY BATTERIES 审中-公开

    公开(公告)号：EP4071872A1

    公开(公告)日：2022-10-12

    申请号：EP21167334.8

    申请日：2021-04-08

    申请人： Solvay SA

    发明人： CHOI, Ji-Ae ,  MOON, Eun-Ji ,  LEE, Jong-Hyun ,  WON, Ji-Hye ,  HWANG, Hyung-Kwon

    IPC分类号： H01M10/0525 ,  H01M10/0569 ,  H01M4/36 ,  H01M4/38 ,  H01M4/525 ,  H01M4/587 ,  H01M10/0567 ,  H01M10/0568

    摘要： The present invention pertains to a liquid electrolyte for lithium secondary batteries comprising:
    a) at least one fluorinated acyclic diether represented by the formula (I)

             R 1 -O-R 2 -O-R 3      (I)

    wherein R 1 and R 3 represent a fluorinated straight-chain alkyl group respectively; R 2 represents an optionally fluorinated straight-chain alkyl group; and the sum of carbon atoms in R 1 , R 2 , and R 3 is from 3 to 10, preferably from 5 to 8, and more preferably 6;
    b) at least one fluorinated acyclic compound selected from the group consisting of a fluorinated acyclic carboxylic acid ester represented by the formula (II), a fluorinated acyclic carbonate represented by the formula (III), and a mixture thereof

             R 4 -COO-R 5      (II)

             R 6 -OC(O)O-R 7      (III)

    wherein R 4 , R 5 , R 6 , and R 7 represent an alkyl group respectively; the sum of carbon atoms in any of R 4 and R 5 , and R 6 and R 7 is from 2 to 7; and at least one hydrogen in R 4 and/or R 5 , and R 6 and/or R 7 is replaced by fluorine;
    c) at least one organic carbonate; and
    d) at least one lithium salt,
    with a provision that b) and c) are different.
    The present invention also relates to a lithium secondary battery comprising an anode, a cathode, a separator and a liquid electrolyte according to the present invention.