Toyota Jidosha Kabushiki Kaisha

Sophia School Corporation

Kyoko Kikuchi

Shinobu Okayama

Katsuhiko Nagaya

Tomohiro Nakano

Hiroyuki Yamaguchi

Mitsuru Sakano

Hiroshi Onizuka

Masahiro Fujita

A method of producing a lithium-ion secondary battery includes the following (α) and (β): (α) preparing a lithium-ion secondary battery, the lithium-ion secondary battery including at least a positive electrode, a negative electrode, and an electrolyte solution; and (β) adding a zwitterionic compound to the electrolyte solution. The negative electrode includes at least a negative electrode active material and a film. The film is formed on a surface of the negative electrode active material. The film contains a lithium compound. The zwitterionic compound contains a phosphonium cation or an ammonium cation and a carboxylate anion in one molecule.

Method of producing lithium-ion secondary battery, lithium-ion secondary battery, and method of using zwitterionic compound

A production method for a lithium-ion secondary battery includes configuring an electrode group provided with a positive electrode and a negative electrode, storing the electrode group, electrolytic solution, and a third electrode in a housing, charging the negative electrode by performing charging between the third electrode and the negative electrode inside the housing, and discharging the charged negative electrode by performing discharging between the third electrode and the negative electrode, thereby producing the lithium-ion secondary battery.

Production method for lithium-ion secondary battery

A lithium ion secondary battery includes a housing. An electrode group and an electrolytic solution are in the housing. The electrode group is immersed in the electrolytic solution. The electrode group includes a positive electrode including a positive electrode active material layer and a negative electrode including a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is disposed on a surface of the negative electrode current collector. A metal piece is electrically connected to the negative electrode current collector. The metal piece is disposed at a position at which at least a part of the metal piece is immersed in the electrolytic solution. An oxidation-reduction potential of the metal piece is within an overdischarging voltage range and is lower than an oxidation-reduction potential of the negative electrode current collector.

Lithium ion secondary battery and method of producing the lithium ion secondary battery

A non-aqueous electrolyte secondary battery according to the present invention includes a positive electrode, a negative electrode, and a non-aqueous electrolyte solution. The negative electrode includes a coating derived from lithium bis(oxalate)borate. The coating derived from lithium bis(oxalate)borate includes a coating containing boron element and a coating containing oxalate ion. A ratio of the boron element contained in the coating derived from lithium bis(oxalate)borate to the oxalate ion is equal to or more than 5. Accordingly, it is possible to provide a non-aqueous electrolyte secondary battery capable of reliably obtaining the effect due to the formation of a coating.

Growing community of inventors

Okazaki, Japan

Kyoko Kikuchi