Kabushiki Kaisha Toyota Jidoshokki

Kayo Mizuno

Takayuki Kato

Manabu Miyoshi

Keiichi Hayashi

Yuichi Hirakawa

Hideaki Shinoda

Megumi Yamamoto

Yoshikatsu Kawabata

A negative-electrode material has negative-electrode active-material particles including: an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and an elementary compound being capable of undergoing an alloying reaction with lithium. The negative-electrode active-material particles includes particles whose particle diameter is 1 &#x3bc;m or more in an amount of 85% by volume or more of them when the entirety is taken as 100% by volume, exhibit a BET specific surface area that is 6 m/g or less, and exhibits a 'D' that is 4.5 &#x3bc;m or more.

Negative-electrode material and negative electrode for use in lithium-ion secondary battery as well as lithium-ion secondary battery

A negative electrode for lithium-ion secondary battery including a negative electrode that includes a current collector; and a negative-electrode active-material layer formed on a surface of the current collector, and including negative-electrode active-material particles. The negative-electrode active-material particles include an element being capable of sorbing and desorbing lithium ions, and being capable of undergoing an alloying reaction with lithium; or/and an elementary compound being capable of undergoing an alloying reaction with lithium, the negative-electrode active-material particles include particles whose particle diameter is 1 &#x3bc;m or more in an amount of 85% by volume or more thereof when the entirety is taken as 100% by volume, and exhibit a 'D' being 3 &#x3bc;m or more. The negative-electrode active-material layer having a thickness that is 1.4 times or more of a 'D' that said negative-electrode active-material particles exhibit.

Negative-electrode stuff and negative electrode for use in lithium-ion secondary battery as well as lithium-ion secondary battery

A lithium-ion secondary battery including a negative electrode including negative-electrode active-material particles including an element being capable of sorbing and desorbing lithium ions, and being capable of alloying with lithium; or/and an elementary compound including an element that is capable of alloying with lithium; a positive electrode including a positive-electrode active material that enables Li ions to be sorbed therein and desorbed therefrom; and an electrolytic solution made by dissolving an electrolyte in a solvent. The negative-electrode active-material particles include particles whose particle diameter is 1 &#x3bc;m or more in an amount of 85% by volume or more thereof when the entirety of said negative-electrode active-material particles, which are included in said negative electrode, is taken as 100% by volume, and the negative-electrode active-material particles exhibit a 'D' being 3 &#x3bc;m or more. The solvent in the electrolytic solution includes a fluorinated ethylene carbonate.

Growing community of inventors

Kariya, Japan

Kayo Mizuno