Silicon oxide powder and making method

   
   

A silicon oxide powder represented by the formula: SiOx wherein 1.05.ltoreq.x.ltoreq.1.5 and having a BET specific surface area of 5-300 m.sup.2 /g is useful as a negative electrode material to construct a lithium ion secondary cell having a high capacity and improved cycle performance.

Ein Silikonoxidpuder dargestellt durch die Formel: SiOx, worin 1.05.ltoreq.x.ltoreq.1.5 und Haben einer WETTE spezifischen Fläche von 5-300 m.sup.2 /g nützlich als negatives Elektrode Material ist, eine Lithiumionensekundärzelle zu konstruieren, die eine hohe Kapazität und verbesserte eine Zyklusleistung hat.

 
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