Kabushiki Kaisha Toyota Jidoshokki

The University of Tokyo

Tomoyuki Kawai

Atsuo Yamada

Yuki Yamada

Yoshihiro Nakagaki

Hiroyuki Sasaki

Yuki Hasegawa

Junichi Niwa

Kohei Mase

Nobuhiro Goda

Kenji Usui

Takeshi Maki

Hitoshi Aikiyo

Atsushi Minagata

Manabu Miyoshi

Yuki Sugimoto

Yuuhi Sato

Kensuke Yotsumoto

Shunya Sakamoto

Toshiya Arakawa

Yuki Ichikawa

Ryota Okamoto

A lithium ion secondary battery having excellent durability is provided. The lithium ion secondary battery includes: a positive electrode including a current collector made from aluminum; a negative electrode; and an electrolytic solution. The electrolytic solution contains an electrolyte including a lithium salt, and a linear carbonate represented by formula (2), the linear carbonate is contained at a mole ratio of 3 to 6 relative to the lithium salt, and the electrolyte includes a first lithium salt represented by formula (1) and a second alkali metal salt; (RX)(RSO)NLi: formula (1); and ROCOOR: formula (2).

Lithium ion secondary battery

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

Electrolytic solution

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.

An electrolytic solution for a power storage device, the electrolytic solution containing water as a solvent, wherein an amount of the solvent is greater than 4 mol and not greater than 15 mol with respect to 1 mol of an alkali metal salt.

Aqueous electrolytic solution for power storage device and power storage device including said aqueous electrolytic solution

An objective is to provide a novel aqueous electrolytic solution constituting an aqueous power storage device that stably operates even at a high voltage. An electrolytic solution for a power storage device contains water as a solvent and has a composition in which an amount of the solvent is not greater than 4 mol with respect to 1 mol of an alkali metal salt.

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Kariya, Japan

Tomoyuki Kawai