Kabushiki Kaisha Toyota Jidoshokki

Hideaki Shinoda

Manabu Miyoshi

Megumi Yamamoto

Takayuki Kato

Keiichi Hayashi

Yuichi Hirakawa

Kayo Mizuno

Yoshikatsu Kawabata

Hirokuni Akiyama

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.

It is an assignment to provide the following: a negative-electrode material for electric storage device, a negative electrode for electric storage device, and an electric storage device, negative-electrode material, negative electrode and electric storage device in which SiOis used as a negative-electrode active material, which excel in the conductivity, and which can inhibit the discharge capacity from declining; as well as a vehicle having the electric storage device on-board. In the negative-electrode material for electric storage device, acetylene black is used as a conductive additive; and, when a sum of contents of SiO, graphite, conductive additive and a binder resin is taken as 100% by mass, the contents are made so as to be as follows: a content of a negative-electrode active material including the SiOand graphite is 70% by mass or more; the content of the SiOis from 17% by mass or more and 40% by mass or less; a sum of the contents of the conductive additive and binder resin is from 8% by mass or more to 20% by mass or less; and the content of the conductive additive is from 6% by mass or more to 12% by mass or less.

Negative electrode material for electric storage device, negative electrode for electric storage device, electric storage device, and vehicle

Provided is a negative electrode active material containing SiOand carbonaceous particles containing graphite and having both good discharge capacity and good electric conductivity. Also provided is a negative electrode using the negative electrode active material and a nonaqueous electrolyte secondary battery. When the carbonaceous particles have an average particle diameter Dof &#x3b1; (&#x3bc;m) and a BET specific surface area of &#x3b2; (m/g), the &#x3b1; and the &#x3b2; satisfy the following Formulae (1) and (2).&#x3b2;&#x2266;&#x2212;(12/18)&#x3b1;+12&#x2003;&#x2003;(1)5&#x2266;&#x3b1;&#x2266;15&#x2003;&#x2003;(2).

Growing community of inventors

Kariya, Japan

Hideaki Shinoda