Sanyo Electric Co., Ltd.

Takuya Hashimoto

Atsushi Fukui

Shin Fujitani

Yasuhiko Itoh

Koji Nishio

Masahisa Fujimoto

Ikuo Yonezu

Mutsumi Yano

Mamoru Kimoto

Hiroshi Nakamura

Teruhiko Imoto

Nobuyuki Higashiyama

Kikuko Kato

Hiroaki Ikeda

Yohei Hirota

A negative electrode for lithium secondary battery characterized in that the electrode is obtained by sintering a mixture of an active material alloy and a binder disposed on a current collector, or a mixture of an active material alloy, conductive metal powder and a binder disposed on a current collector, and the active material alloy after sintered is substantially amorphous.

Negative electrode for lithium secondary battery and manufacturing method thereof

Negative electrode for lithium secondary battery

The negative electrode of this invention includes, as a negative electrode active material, substantially amorphous aluminum alloy in the form of a powder with an average particle size of 50 &mgr;m or less represented by a composition formula, Al M , in which M is at least one element selected from the group consisting of La, Y, Yb, Ce, Gd, Nd, Sm, Pr, Er, Ni, Co, Cu and Fe; and 1&lE;x&lE;20. Owing to this negative electrode, a lithium secondary battery having large discharge capacity and exhibiting very good charge-discharge cycle performance can be realized.

In a lithium secondary battery of this invention, the negative electrode uses, as an active material, an alloy including an A phase of a first intermetallic compound (A), and a B phase of a second intermetallic compound (B) having the same constituent elements as and a different composition from the first intermetallic compound (A) and/or a C phase consisting of one of the constituent elements of the first intermetallic compound (A), and at least one of the A phase, the B phase and the C phase is capable of electrochemically absorbing and discharging lithium ions. Thus, the lithium secondary battery can exhibit good charge-discharge cycle performance.

Lithium secondary battery

In the present invention, a hydrogen absorbing alloy obtained by sintering hydrogen absorbing alloy powder containing not less than 50% by weight of particles having a particle diameter of not more than 25 &mgr;m at a temperature of not more than 850&deg; C. is used for a hydrogen absorbing alloy electrode for an alkali storage battery, and the hydrogen absorbing alloy electrode for an alkali storage battery is used as a negative electrode of the alkali storage battery.

Hydrogen absorbing alloy for alkali storage battery, hydrogen absorbing alloy electrode for alkali storage battery, and alkali storage battery

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Hirakata, Japan

Takuya Hashimoto