To provide a negative electrode material and a manufacturing method of the same having high discharge capacity and discharge/charge efficiency, an excellent cycle life, and stable performance by improving the cycle life of the negative electrode material for a nonaqueous electrolyte secondary battery having an active material phase (a phase reversely reacting with Li) of high capacity such as Si and Sn, and an inactive phase (for example, CoSi
This manufacturing method conducts mechanical grinding processing (crushing and granulation by grinding) of the negative electrode material obtained by quenching from molten metal with a ball mill type device (an attritor, vibrating ball mill, planetary ball mill or the like), or conducts the mechanical grinding processing of mixture of fine powder of the active material phase and the inactive phase. A contained rate of the active material phase does not change before and after the processing. The active material phase of the negative electrode material subjected to the mechanical grinding processing is fined, and a peak strength of at least one active material phase becomes not more than 50 % of the peak strength before the mechanical grinding processing in an X-ray diffraction pattern.
COPYRIGHT: (C)2004,JPO
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Tatsuo Nagata
Hideya Uenaka
Yasuto Higashida
Matsushita Electric Industrial Co., Ltd
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