Enax, Inc.

Munehiro Kadowaki

Kazunori Ozawa

Hironori Ozawa

Kiyoko Abe

Tsuyoshi Temma

Syujun Shikano

Shoji Sasaki

Kanji Matsuda

There is provided a simple-structured and inexpensive device for stacking a successive separator and sheet electrodes which can protect an end portion of a sheet electrode when folding the successive separator, and which enables smooth folding of the separator to improve the productivity. The device comprises a stacking stagewhich adsorbs and holds a leading end of the tape-like separator S, and on which sheet electrodes P, N and the separator S are successively stacked, separator reciprocating means for reciprocating the tape-like separator S on the stacking stagewith the stacking stagebeing as a center, and a folding guide memberwhich comes close/moves apart relative to the stacking stage, covers both side ends of the stacked sheet electrode P, N in the moving direction of the separator S, and guides folding of the separator S accompanied by a reciprocal movement of the separator S at both side ends of the sheet electrode.

Device for stacking successive separator and sheet electrode

A negative electrode carbon material for a lithium ion secondary battery manufactured by calcinating a rice starch portion obtained by removing the pericarp and tests from unpolished rice and a method for manufacturing the same. The rice starch portion is preferably middle-grade white bran or high-grade white bran each obtained when unpolished rice is polished. The above negative electrode carbon material may have a relatively broad peak at a 2&#x3b8; of 40 to 50&#xb0; and a sharp peak at a 2&#x3b8; of 42 to 44&#xb0; in its powder X-ray (CuK&#x3b1;) diffraction. According to the present invention, a negative electrode carbon material for a lithium ion secondary battery which has the same quality as the prior art product can be manufactured at a low cost by making effective use of middle-grade white bran or high-grade white bran of rice.

Negative electrode carbon material for lithium ion secondary battery and manufacturing method thereof

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Yonezawa, Japan

Munehiro Kadowaki