Patent ID: 6605386
Filing Date: 2003-08-12
Classification: H01M,Y02E

Abstract:
A non-aqueous electrolyte secondary battery comprising:a) a positive electrode and a negative electrode capable of intercalating and de-intercalating lithium; b) a non-aqueous electrolyte; and c) one of a separator and a solid electrolyte, wherein: said negative electrode comprises a plurality of composite particles, each of said composite particles comprises a central portion consisting essentially of at least one element selected from the group consisting of tin, silicon and zinc, and a coating at least partially around said central portion, said coating comprising a solid solution or an intermetallic compound, said solid solution or said inter-metallic compound comprises a) at least one element selected from the group consisting of tin, silicon and zinc, and b) at least one element selected from the group consisting of group 2 elements, transition elements, group 12 elements, group 13 elements and group 14 elements of the Periodic Table exclusive of carbon and exclusive of said element selected from the group consisting of tin, silicon, and zinc in said solid solution or said inter-metallic compound, said negative electrode comprises a mixture layer comprising said plurality of composite particles, and the porosity of said mixture layer is not less than 10% and not more than 50%.