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1.发明公开
公开(公告)号：EP3972029A1
公开(公告)日：2022-03-23
申请号：EP20812799.3
申请日：2020-02-26
发明人： MA, Qiang , QIN, Dejun , DENG, Yaoming , LI, Yangxing , XU, Fan
IPC分类号： H01M10/0567 , H01M10/0569
摘要： Embodiments of the present invention provide a lithium secondary battery electrolyte including a lithium salt, an organic solvent, and a flame retardant, and the flame retardant includes (pentafluoro) cyclotriphosphazene substituted by an electron donating group and (pentafluoro) cyclotriphosphazene substituted by an electron withdrawing group. Both two flame retardants: the (pentafluoro) cyclotriphosphazene substituted by the electron donating group and the (pentafluoro) cyclotriphosphazene substituted by the electron withdrawing group are added to the lithium secondary battery electrolyte, so that a battery has both high safety performance and good electrochemical performance. The embodiments of the present invention further provide a preparation method for the lithium secondary battery electrolyte and a lithium secondary battery including the lithium secondary battery electrolyte.
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2.发明公开
公开(公告)号：EP3719912A1
公开(公告)日：2020-10-07
申请号：EP18887713.8
申请日：2018-12-11
发明人： MA, Qiang , LI, Yangxing , QIN, Dejun
IPC分类号： H01M10/0567 , H01M10/0525
摘要： Embodiments of the present invention provides an electrolyte additive. A molecular structure of the electrolyte additive includes a six-membered ring structure including three nitrogen atoms and three phosphorous atoms; each phosphorous atom includes two substituted groups, and the substituted groups are respectively represented as R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 ; at least one substituted group of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 is a substituted sulfonic group; and a remaining substituted group is any one selected from fluorine, chlorine, bromine, alkyl, haloalkyl, alkoxy, haloalkoxy, alkeny, haloalkenyl, alkenyloxy, haloalkenyloxy, aryl, haloaryl, aryloxy, haloaryloxy, a substituted phosphate ester group, a substituted imide group, and a substituted sulfonyl imide group. The electrolyte additive has dual characteristics of flame resistance and high-voltage resistance. Applying the electrolyte additive to a lithium secondary battery can effectively improve high-voltage cycle performance and security reliability of the lithium secondary battery. The present invention further provides a lithium secondary battery electrolyte and a lithium secondary battery.
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