Patent ID: 8313860

Claim:
An electrochemical cell comprising: an anode comprising a copper foil supporting member and, a carbonaceous material attached to said supporting member, said carbonaceous material includes a mixture of 90% graphite and 10% Poly Vinylidene difluoride that is capable of reversibly incorporating lithium ions therein and lithium metal on the surface thereof; a cathode capable of reversibly incorporating therein lithium ions, said cathode includes an electrically conducting aluminum support member and a mixture of 90% LiAlNiCoO 2 , 5% carbon powder, and 5% Poly Vinylidene difluoride attached to said aluminum support member; and a non-aqueous electrolyte including 1 molar LiPF 6 in a mixture of ethylene carbonate, dimethyl-carbonate and diethyl-carbonate in contact with said anode and said cathode; wherein the ratio of the capacity to reversibly incorporate lithium ions of said cathode to the capacity to reversibly incorporate lithium ions in the form of LiC 6 of said carbonaceous material of said anode is equal to 4.5:1, wherein in the fully charged state of said electrochemical cell at an open circuit voltage of 4.1 Volt, said carbonaceous material of said anode has a layer of metallic lithium deposited thereupon, said layer of metallic lithium accounts for 77.8% or more of the electrical charge capacity of said cell at said fully charged state, and wherein the charge retention capacity of said electrochemical cell, after the fully charged cell is stored for 14 days at a temperature of 72° C. followed by a constant current discharge of 250 mA to a cutoff at 2.5 Volt, is higher than 97.9%.