Patent ID: 6403256
Filing Date: 2002-06-11
Classification: H01M,Y02E,Y02P

Abstract:
An electrochemical cell, which comprises:a) an anode comprising an alkali metal; b) a cathode comprising a cathode active material; and c) a nonaqueous electrolyte activating the anode and the cathode, the nonaqueous electrolyte comprising: i) an additive of the general formula R1OS(&boxH;O)(OR2) having at least one unsaturated hydrocarbon containing a C(sp2 or sp3)â€”C(sp3) bond unit having the C(sp3) carbon directly connected to the â€”OSO2â€” functional group, wherein R1 and R2 are the same or different and they can both be a hydrogen atom or an organic group containing 1 to 12 carbon atoms, and wherein at least R1 has the structure (R3)(R4)(R5)Câ€” if R2â‰ H with at least R3 being an aromatic substituent or an unsaturated organic or inorganic group and wherein if any of the remaining groups of R4 and R5 is a saturated organic group, the saturated organic group contains 1 to 11 carbon atoms; and ii) an alkali metal salt dissolved therein.