Patent ID: 7026069

Claim:
A rechargeable lithium electrochemical system, comprising: a lithium anode; a mixed metal oxide cathode; an LiPF 6 organic electrolyte; said cathode being composed of a positive, active lithium manganese bismuth mixed metal oxide compound having the general formula Li x MnO 2 (Bi 2 O 3 ) y , where said subscript x is greater than 0.45 and less than 0.55 and said subscript y is greater than 0.025 and less than 0.075; said mixed metal oxide compound resulting from a solid-state reaction between manganese oxide, a lithium compound and Bi 2 O 3 ; said manganese oxide being selected from the group of manganese oxides consisting of MnO 2 , Mn 2 O 3 and Mn 3 O 4 ; said lithium compound being selected from the group of lithium compounds consisting of Li 2 CO 3 , LiOH, Li 2 O 2 and Li 2 O; said mixed metal oxide compound being in solid form and having a reversible region for said subscript x greater than 0.4 and less than 1.0; said cathode providing a sustained specific capacity of about 120 mAhrs/g; said mixed metal oxide compound having a reduced charge transfer impedance due to a catalytic reaction causing said cathode to prevent an overcharge and prevent a phase change; said mixed metal oxide compound, a conductive carbon and a binder being mixed in a predetermined ratio; and said cathode being fully reversible against said lithium compound.