Patent ID: 7537862

Claim:
A negative electrode for a non-aqueous electrolyte secondary battery, comprising graphite and at least one alloying material capable of electrochemically absorbing and desorbing Li, said alloying material comprising an A phase composed mainly of Si and a B phase comprising an intermetallic compound of at least one transition metal element and Si, at least one of said A phase and said B phase comprising a microcrystalline or amorphous region, the weight percentage of said A phase relative to the total weight of said A phase and said B phase being greater than 40% and not greater than 95%, the weight percentage of said graphite relative to the total weight of said alloy material and said graphite being not less than 50% and not greater than 95%, wherein the negative electrode for a non-aqueous electrolyte secondary battery further comprises an auxiliary conductive agent, said auxiliary conductive agent comprising carbon fibers having an aspect ratio of 10 or more, and at least one end of said carbon fibers is adhered or bonded to said alloying material.