Patent ID: 7955735
Filing Date: 2011-06-07
Classification: H01M,Y02E,Y02P

Abstract:
1. A non-aqueous electrolyte secondary battery comprising: a positive electrode capable of reversibly absorbing and desorbing Li; a negative electrode; and a non-aqueous electrolyte, said negative electrode comprising an alloying material that is 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, said at least one transition metal element is Ti, and the Si content in said alloying material is 72.4 to 97.7% by weight at least one of said A phase and said B phase comprising a microcrystalline or amorphous region, the weight percent of said A phase relative to the total weight of said A phase and said B phase being not less than 50% and not greater than 95%.