| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an Si alloy negative electrode material excellent in conductivity for an electricity storage device, such as a lithium ion secondary battery and a hybrid capacitor, accompanied by the transfer of lithium ions in charging/discharging, and a method for producing the Si alloy negative electrode material. <P>SOLUTION: An Si alloy negative electrode material excellent in conductivity is powder comprising a composite phase consisting of an Si phase and an SixCuy phase comprising an SixCuy alloy that is an intermetallic compound of Si and Cu, while x<y is satisfied in a composition of the SixCuy phase, an average particle diameter of the Si phase comprising Si as a main phase is 10 μm or less, and at least a part of the Si phase is surrounded by the SixCuy phase. <P>COPYRIGHT: (C)2012,JPO&INPIT |
