Patent ID: 6506520
Filing Date: 2003-01-14
Classification: H01M,Y02E

Abstract:
A non-aqueous electrolyte secondary battery comprising:a positive electrode, a negative electrode capable of intercalating and de-intercalating lithium, a non-aqueous electrolyte solution, and a separator or a solid electrolyte, wherein: said negative electrode comprises a plurality of composite particles, each of said composite particles comprises a central portion comprising lithium and 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 solid solution or an inter-metallic compound, said solid solution or inter-metallic compound comprising a) said 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 exclusive of carbon, and exclusive of said at least element selected from the group consisting of tin, silicon, and zinc; wherein the lithium content of said central portion is 40-95 atomic percent of the theoretical lithium content limit of the central portion.