Patent ID: 6495291
Filing Date: 2002-12-17
Classification: H01M,Y02E

Abstract:
A nonaqueous electrolyte secondary battery, comprising a positive electrode, a nonaqueous electrolyte and a negative electrode containing a negative electrode active material,wherein said negative electrode active material contains a composite material having a composition represented by formula (1) and said composite material has a microstructure containing a carbon-containing phase and a crystal phase an average size of said crystal phase falling within a range of between 0.01 &mgr;m and 10 &mgr;m; M1xM2yC1-x-yâ€ƒâ€ƒ(1) â€ƒwhere M1 is at least one element selected from the group consisting of Si, Ge, Sn, Pb, B, Al, Ga, In, Sb and Zn, M2 is at least one element having an electronegativity larger than that of Li and excluding M1 and Fe, and the atomic ratios x and y are: 0.01&lE;x&lE;0.7 and 0