ELECTROCHEMICAL CELLS COMPRISING BIFUNCTIONAL PHOSPHONIC ACID SILYLESTERS

An electrochemical cell comprising (A) an anode comprising at least one anode active material, (B) a cathode comprising at least one cathode active material selected from mixed lithium transition metal oxides containing Mn and at least one second transition metal; lithium intercalating mixed oxides containing Ni, Al and at least one second transition metal; LiNiPO; LiMnPO; and LiCoPO; (C) an electrolyte composition containing (i) at least one aprotic organic solvent; (ii) at least one lithium ion containing conducting salt; (iii) a compound of formula (I).