Semiconductor Energy Laboratory Co., Ltd.

Miku Fujita

Mayumi Mikami

Shunpei Yamazaki

Hiroyuki Miyake

Takahiro Kawakami

Nobuhiro Inoue

Jun Ishikawa

Mako Motoyoshi

Kazuhei Narita

Ryo Yamauchi

A negative electrode active material with high capacity and excellent cycle performance and rate performance is provided. In addition, a secondary battery including the negative electrode active material, and an electronic device including the secondary battery are provided. Nanosilicon is mixed with a solid electrolyte containing lithium, titanium, phosphorus, and oxygen, and graphene oxide is further added thereto. Then, graphene oxide contained in the mixture is reduced with ethanol in which ascorbic acid and lithium hydroxide hydrate are dissolved, so that the negative electrode active material is manufactured.

Negative electrode active material, secondary battery, and electronic device

A power storage device having high capacitance is provided. A power storage device with excellent cycle characteristics is provided. A power storage device with high charge and discharge efficiency is provided. A power storage device including a negative electrode with low resistance is provided. A negative electrode for a power storage device includes a number of composites in particulate forms. The composites include a negative electrode active material, a first functional material, and a compound. The compound includes a constituent element of the negative electrode active material and a constituent element of the first functional material. The negative electrode active material includes a region in contact with at least one of the first functional material or the compound.

Negative electrode for power storage device, power storage device, and electric device

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Kanagawa, Japan

Miku Fujita