Patent ID: 6136472
Filing Date: 2000-10-24
Classification: C01B,H01M,Y02E

Abstract:
A lithium ion battery which comprises a positive electrode and a negative electrode; said negative electrode comprising an active material consisting of an insertion material in a pre-charge state; said positive electrode having an active material comprising a silicophosphate compound of the nominal general formula Li.sub.a M'.sub.(2-b) M"".sub.b Si.sub.c P.sub.3-c O.sub.12, 0.ltoreq.b.ltoreq.2, 0<c<3, a is greater than zero and selected to represent the number of Li atoms to balance said formula; where M' and M"" are the same or different from one another and are each elements selected from the group consisting of metal and metalloid elements; and wherein said compound is characterized by extraction of lithium ions therefrom during charging cycle of said battery; said negative electrode active material characterized by inserting said extracted lithium ions during said charging cycle, and by subsequent extraction of lithium ions therefrom during discharge cycle; and said compound further characterized by reinserting said discharge cycle lithium ions.