Shin-kobe Electric Machinery Co., Ltd.

Youshin Yagi

Kenji Nakai

Yoshimasa Koishikawa

Kensuke Hironaka

Yuichi Takatsuka

Takeshi Nakano

The present invention is to provide a non-aqueous electrolytic solution secondary battery which has high safety while maintaining high capacity and high power. A cylindrical lithium-ion battery is provided in a battery lid which is a portion of a battery container with a cleavage valve which cleaves at a predetermined pressure, and includes an electrode winding group prepared by winding a positive electrode, a negative electrode and a separator, connection portions for connecting the electrode winding group to respective electrode terminals, and non-aqueous electrolytic solution therein. As a positive electrode active material, lithium manganate where the amount of elution of manganese into the non-aqueous electrolytic solution is 5% or less based on the lithium manganate in a region where an electrode potential to metal lithium is 4.8V or more is used. As a negative electrode active material, graphite in/from which lithium ions can be occluded/released according to charging and discharging is used.

Non-aqueous electrolytic solution secondary battery

A cylindrical lithium-ion battery accommodates a winding group , is structured by winding a positive electrode using lithium manganate (Li Mn O or Li Mn Al O ) having an average particle diameter of primary particles in a range of from 0.1 &mgr;m to 2 &mgr;m as a positive electrode active material and a negative electrode using amorphous carbon as a negative electrode active material via a separator, and a non-aqueous electrolytic solution within a battery container

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Osato-gun, Japan

Youshin Yagi