Showa Denko K.k.

Umicore

Arihiro Mutoh

Masataka Takeuchi

Hirokazu Murata

Nobuaki Ishii

Stijn Put

Yoshiaki Ikenoue

Jan Gilleir

Kris Driesen

Masashi Sakaguchi

A production method for a composite of fine particles (A) and carbon particles (B), including the steps of: mixing fine particles (A) formed of a substance comprising at least one kind of Si, Sn, Al, Ge and In; and molten pitch, to obtain a mixture (); pulverizing the mixture () to obtain a pulverized product (); dry-mixing the pulverized product () and carbon particles (B) to obtain a mixture (); and firing the mixture (), followed by pulverization; or including the steps of: adding carbon particles (B) to the mixture (), followed by dry mixing and pulverizing, to obtain a pulverized product (); and firing the pulverized product (), followed by pulverization.

Method for producing composite, and negative electrode material for lithium ion battery

A negative electrode material for lithium ion batteries is obtained by a method which includes: mixing carbon particles (B) such as graphite particles, particles (A), such as Si particles, containing an element capable of occluding and releasing lithium ions, a carbon precursor such as sucrose, a carboxylic acid compound such as acetic acid, and a liquid medium such as water or isopropyl alcohol to prepare a slurry; drying and solidifying the slurry; and heat-treating the resulting solidified material to carbonize the carbon precursor. A lithium ion battery is obtained using this negative electrode material.

Method for producing negative electrode material for lithium ion batteries

Growing community of inventors

Tokyo, Japan

Arihiro Mutoh