Gunma University

Toyota Jidosha Kabushiki Kaisha

Shin-ichi Tobishima

Hideyuki Morimoto

Takayuki Hirose

Hitotoshi Murase

Masato Kamiya

Yohei Shindo

Manabu Miyoshi

Taira Saito

Keiichi Hayashi

Masafumi Unno

Provided is a negative-electrode active material, which is capable of constituting a lithium ion secondary cell exhibiting excellent cell characteristics. The negative-electrode active material for a lithium ion secondary cell of the invention includes a mixed material of silicon oxide particles composed of silicon oxide and rod-shaped iron oxide particles composed of iron oxide. It is preferable to use iron oxide particles having a plurality of pores in a surface, and an electrode reaction is effectively carried out.

Lithium ion secondary cell

This invention provides a lithium secondary battery comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte. On the negative electrode surface, there is present a cyclic siloxane and/or a reaction product thereof. The cyclic siloxane is a cyclic siloxane having at least one side chain comprising a dimethylsiloxy group (a siloxy side chain-containing cyclic siloxane).

Lithium secondary battery and method for producing same

An active material used for an electrochemical device utilizing Li ion conduction, and capable of improving cycle stability. The object is attained by providing an active material used for an electrochemical device utilizing Li ion conduction, including an active substance capable of absorbing and releasing a Li ion, and an Na ion conductor disposed on the surface of the active substance and having a polyanionic structure.

Active material and lithium ion battery

A negative electrode for a lithium secondary battery, in which &#x3b1;-FeOthat is low in cost, has little environmental impact and has high theoretical capacity is used as an active material, maintains high adhesiveness between a current collector and an electrode layer, and can simultaneously achieve both of an improvement in the cycle characteristics and high capacity. In a negative electrode for a lithium secondary battery, which is configured of a current collector, and an electrode layer that is formed on the current collector and contains at least a negative electrode active material, a conductive assistant and a binder component, the negative electrode active material is composed of &#x3b1;-FeOparticles that generate a conversion electrode reaction, the binder component is a mixture of polyamide acid and partially imidized polyamide acid. The electrode layer is configured so that a concentration of the binder component decreases as distanced from the current collector.

Negative electrode for lithium secondary battery and method for producing same

Growing community of inventors

Maebashi, Japan

Shin-ichi Tobishima