Murata Manufacturing Co., Ltd.

Raman Kukreja

Masahiro Miyamoto

Tomomi Sakuma

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The negative electrode includes a film covering a negative electrode active material layer. The electrolytic solution includes a chain carboxylic acid ester. According to an analysis of the film by inductively coupled plasma optical emission spectroscopy, a content of boron in the film is greater than or equal to 10 μmol/mand less than or equal to 30 μmol/m, a content of sulfur in the film is greater than or equal to 20 μmol/mand less than or equal to 70 μmol/m, and a ratio of the content of sulfur to the content of boron is greater than or equal to 1.0 and less than or equal to 3.0.

Secondary battery having a film covering a negative active material layer

A lithium-ion secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution that includes an alkoxy compound represented by CX—O—(CX)—OH. Each X represents hydrogen (H) or a halogen, m is an integer of 1 or greater, n is an integer of 1 or greater, and (m+n) is 4 or greater.

Growing community of inventors

Kyoto, Japan

Raman Kukreja