Patent ID: 6511772
Filing Date: 2003-01-28
Classification: H01M,Y02E,Y10T

Abstract:
An electrochemical cell comprising a negative electrode, a positive electrode and a non-aqueous electrolyte, the improvement in the cell comprising:the negative electrode comprising an anode material contacted to an anode current collector and the positive electrode comprising a cathode active material contacted to a cathode current collector, wherein the anode material and the cathode active material are either comprised of lithium or are capable of intercalating and deintercalating lithium and wherein at least one of the anode material and the cathode active material is mixed with a phosphate compound prior to being contacted to the respective anode current collector and cathode current collector, wherein the phosphate additive has the formula: (R1O)P(&boxH;O)(OR2)(OR3), wherein R1, R2 and R3 are the same or different and at least one, but not all three, of the R groups is hydrogen, or at least one of the R groups has at least 3 carbon atoms and contains an sp or sp2 hybridized carbon atom bonded to an sp3 hybridized carbon atom bonded to the oxygen atom bonded to the phosphorous atom, and wherein the remaining groups which are not hydrogen or which do not contain an sp or sp2 hybridized carbon atom bonded to an sp3 hybridized carbon atom are saturated organic groups containing 1 to 13 carbon atoms.