Kabushiki Kaisha Toyota Jidoshokki

The University of Tokyo

Yoshihiro Nakagaki

Tomoyuki Kawai

Nobuhiro Goda

Atsuo Yamada

Yuki Yamada

Masakazu Murase

Yusuke Sugiyama

Atsushi Minagata

Kyoichi Kinoshita

Hiroyuki Sasaki

Kohei Mase

Yuki Hasegawa

Masataka Nakanishi

Tomohiro Niimi

Hiroshi Hirate

Hitoshi Aikiyo

Manabu Miyoshi

Takeshi Kondo

Junichi Niwa

Motoharu Tanizawa

Tsukasa Sugie

Shigenori Koishi

Kensuke Yotsumoto

Takeshi Maki

Yuki Sugimoto

Yuuhi Sato

Mutsumi Takahashi

Yushi Kondo

Takashi Mori

Toshiya Arakawa

Ryota Okamoto

Jun Saida

Masanori Inuida

Provided is a positive electrode active material in which aluminum is dispersed uniformly. A positive electrode active material is crystalline oxide that contains lithium, nickel, and aluminum, and aluminum is dispersed uniformly in a primary particle in the oxide.

Positive electrode active material in which aluminum is dispersed uniformly

An electrolytic solution contains: an electrolyte including a lithium salt represented by general formula (1) below; an organic solvent including a linear carbonate represented by general formula (2) below; and an unsaturated cyclic carbonate, wherein

Electrolytic solution and lithium ion secondary battery

An electrolytic solution of a nonaqueous electrolyte secondary battery contains a metal salt, and an organic solvent having a heteroatom and satisfies Is&#x3e;Io, when an intensity of an original peak of the solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is. For the negative electrode, (1) a graphite whose G/D ratio of G-band and D-band peaks in a Raman spectrum is not lower than 3.5; (2) a carbon material whose crystallite size, calculated from a half width of a peak appearing at 2&#x3b8;=20 degrees to 30 degrees in a X-ray diffraction profile is not larger than 20 nm; (3) silicon element and/or tin element; (4) a metal oxide configured to occlude and release lithium ions; or (5) a graphite whose ratio (long axis/short axis) is 1 to 5.

Nonaqueous electrolyte secondary battery

A method for producing a secondary battery including:

Method for producing secondary battery including coating on electrode surface

To provide a nonaqueous electrolyte secondary battery that suppresses elution of Al from a positive electrode current collector formed of aluminum or an aluminum alloy, and is superior in thermal characteristics and input-output characteristics. Provided is a nonaqueous electrolyte secondary battery including a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode has a positive electrode current collector formed of aluminum or an aluminum alloy. The electrolytic solution contains a metal salt and an organic solvent having a heteroelement. Regarding an intensity of a peak derived from the organic solvent in a vibrational spectroscopy spectrum of the electrolytic solution, Is&#x3e;Io is satisfied when an intensity of an original peak of the organic solvent is represented as Io and an intensity of a peak resulting from shifting of the original peak is represented as Is.

Electrolytic solution

A negative-electrode active material is used for a negative electrode, the negative-electrode active material including: agglomerated particles including nanometer-size silicon produced by heat treating a lamellar polysilane having a structure in which multiple six-membered rings constituted of a silicon atom are disposed one after another, and expressed by a compositional formula, (SiH); and a carbon layer including amorphous carbon, and covering at least some of the agglomerated particles to be composited therewith. An electric storage apparatus including the same is not only able to reduce the irreversible capacity, but also able to inhibit the generation of 'SEI.'

Negative-electrode active material, production process for the same and electric storage apparatus

Providing a silicon-containing material having a novel structure being distinct from the structure of conventional silicon oxide disproportionated to use. A silicon-containing material according to the present invention includes at least the following: a continuous phase including silicon with Si&#x2014;Si bond, and possessing a bubble-shaped skeleton being continuous three-dimensionally; and a dispersion phase including silicon with Si&#x2014;O bond, and involved in an area demarcated by said continuous phase to be in a dispersed state.

Silicon-containing material and secondary-battery active material including silicon-containing material

A nanometer-size silicon material produced by heat treating a lamellar polysilane exhibits Raman-shift peaks existing at 341&#xb1;10 cm, 360&#xb1;10 cm, 498&#xb1;10 cm, 638&#xb1;10 cm, and 734&#xb1;10 cmin a Raman spectrum, has a large specific surface area, and has a reduced SiO content.

Production process for nanometer-size silicon material

Growing community of inventors

Kariya, Japan

Yoshihiro Nakagaki