Patent ID: 6203942
Filing Date: 2001-03-20
Classification: H01M,Y02E

Abstract:
An electrochemical cell, which comprises:a) a negative electrode which intercalates with an alkali metal;b) a positive electrode comprising an electrode active material which intercalates with the alkali metal;c) a nonaqueous electrolyte activating the negative and the positive electrodes; andd) a phosphate additive provided in the electrolyte, wherein the phosphate additive has the formula: (R.sup.1 O)P(.dbd.O)(OR.sup.2)(OR.sup.3) and wherein R.sup.1, R.sup.2 and R.sup.3 are the same or different, wherein at least one, but not all three, of the R groups is hydrogen, wherein the remaining groups which are not hydrogen are saturated organic groups containing 1 to 13 carbon atoms or unsaturated organic groups containing 2 to 13 carbon atoms.