- 专利标题： LIQUID ELECTROLYTE FOR LITHIUM SECONDARY BATTERIES
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申请号： EP21167334.8申请日： 2021-04-08
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公开(公告)号： EP4071872A1公开(公告)日： 2022-10-12
- 发明人: CHOI, Ji-Ae , MOON, Eun-Ji , LEE, Jong-Hyun , WON, Ji-Hye , HWANG, Hyung-Kwon
- 申请人： Solvay SA
- 申请人地址： BE 1120 Brussels Rue de Ransbeek, 310
- 代理机构： Benvenuti, Federica
- 主分类号： H01M10/0525
- 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.
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.
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