Sanyo Electric Co., Ltd.

Shouichirou Sawa

Atsushi Fukui

Maruo Kamino

Hiroshi Minami

Yasuyuki Kusumoto

Taizou Sunano

Katsunobu Sayama

Takuya Sunagawa

Mariko Torimae

Toshio Yanagida

A rechargeable lithium battery including a negative electrode made by sintering, on a surface of a conductive metal foil as a current collector, a layer of a mixture of active material particles containing silicon and/or a silicon alloy and a binder, a positive electrode and a nonaqueous electrolyte, characterized in that the nonaqueous electrolyte contains carbon dioxide dissolved therein.

Lithium secondary battery including a negative electrode which is a sintered layer of silicon particles and/or silicon alloy particles and a nonaqueous electrolyte containing carbon dioxide dissolved therein and method for producing same

A lithium secondary battery having high capacity and good charge-discharge cycle performance is provided. The lithium secondary battery includes a negative electrode () containing silicon as a negative electrode active material, a positive electrode () containing a positive electrode active material, and a non-aqueous electrolyte. The positive electrode active material is a lithium-transition metal composite oxide including a layered structure represented by the chemical formula LiNiMnCoO, where a, x, y, and z satisfy the expressions: 0&#x2266;a&#x2266;1.3, x+y+z=1, 0&#x3c;x, 0&#x2266;y&#x2266;0.5, and 0&#x2266;z.), and the theoretical electrical capacity ratio of the positive electrode to the negative electrode (positive electrode/negative electrode) is 1.2 or less.

Lithium secondary battery

Growing community of inventors

Tokushima, Japan

Shouichirou Sawa