公开(公告)号：EP3657579A1

公开(公告)日：2020-05-27

申请号：EP18835168.8

申请日：2018-07-18

申请人： Nissan Motor Co., Ltd.

发明人： DOI, Shotaro ,  KUSACHI, Yuki ,  HORIE, Hideaki ,  NAKASHIMA, Yusuke ,  TSUCHIDA, Kazuya ,  SUMIYA, Koji ,  ASANO, Shigehito ,  KOGA, Yasuyuki ,  ANDO, Nobuo ,  KOKUBO, Terukazu

IPC分类号： H01M4/36 ,  H01G11/06 ,  H01G11/50 ,  H01G11/86 ,  H01M4/587

摘要： There is provided a means capable of suppressing generation of a lithium dendrite at the time of charging and discharging while sufficiently suppressing an amount of gas generated at the time of initial charging of an electric device.
When a lithium ion is doped in advance to a negative electrode active material, which is used in an electric device including a positive electrode and a negative electrode, after performing a pre-doping step of doping the lithium ion to a negative electrode active material to be doped to reduce a potential (vs. Li+/Li) of the negative electrode active material to be doped with respect to a lithium metal, a dedoping step of dedoping the lithium ion from the negative electrode active material doped with the lithium ion in the pre-doping step to increase a potential (vs. Li+/Li) of the negative electrode active material with respect to the lithium metal is performed.

公开(公告)号：EP3780234A1

公开(公告)日：2021-02-17

申请号：EP19785263.5

申请日：2019-04-09

申请人： NISSAN MOTOR CO., LTD.

发明人： DOI, Shotaro ,  YAMAUCHI, Noboru ,  KUSACHI, Yuki ,  SATOU, Hajime ,  HORIE, Hideaki ,  NAKASHIMA, Yusuke ,  SHOJI, Naofumi ,  TSUCHIDA, Kazuya ,  SUMIYA, Koji ,  HATAZOE, Takumi ,  ASANO, Shigehito ,  ANDO, Nobuo

IPC分类号： H01M10/0568 ,  H01M4/13 ,  H01M4/134 ,  H01M4/36 ,  H01M4/38 ,  H01M4/48 ,  H01M10/052

摘要： Provided is a means that can suppress, in a non-aqueous electrolyte secondary battery that uses a negative electrode active material including a Si material and uses an electrolyte solution including LiFSI, the occurrence of an exothermic reaction that can cause deterioration of the battery even in a case when the battery temperature has risen.
A non-aqueous electrolyte secondary battery according to the present invention has a power generating element that includes a positive electrode in which a positive electrode active material layer including a positive electrode active material is formed on a surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer including a negative electrode active material is formed on a surface of a negative electrode current collector, and a separator impregnated with an electrolyte solution. Here, the negative electrode active material includes a Si material that contains silicon and is capable of insertion and removal of lithium ions. The electrolyte solution contains lithium bis (fluorosulfonyl) imide (LiFSI) and an inorganic lithium salt other than the LiFSI, and has a feature that a ratio of a concentration (mol/L) of the LiFSI with respect to a concentration (mol/L) of the inorganic lithium salt (LiFSI/inorganic lithium salt) in the electrolyte solution is 1 or less.