Patent ID: 7582380

Claim:
An electrochemical cell comprising an anode, a cathode, and an electrolyte, said electrolyte comprising at least one pyrazolium cation, an imidazolium cation, or a combination thereof; and at least one non-Lewis acid derived counter ion, wherein said electrochemical cell has a consistent charge and discharge cycling in a temperature range of from about 20° C. to about 170° C., wherein said counter ion comprises an imide, BETI, methide, TF or any combination thereof, and forms a lithium salt selected from Liimide, LiBETI, Limethide or LiTF or a combination thereof, and wherein said electrochemical cell is rechargeable, wherein said cathode has a cathode capacity and said anode has an anode capacity, and wherein said cathode capacity is greater than said anode capacity.