Clark & Brody
Negative electrode active material for lithium ion secondary battery
A negative electrode active material for a lithium ion secondary battery, comprising silicon, copper and oxygen as major constitutional elements, the negative electrode active material for a lithium ion secondary battery, containing fine particles of silicon having an average crystallite diameter (Dx) measured by an X-ray diffractometry of 50 nm or less, and having elemental ratios, expressed by molar ratios, Cu/(Si+Cu+O) and O/(Si+Cu+O) of from 0.02 to 0.30, wherein the negative electrode active material contains an intermetallic compound of silicon and copper.
DOWA HOLDINGS CO., LTD. TOHOKU UNIVERSITY
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Yasumitsu Qiwu Kazuyuki Norihiro Hiroyuki
Tanaka Zhang Tohji Shimoi Kai