abstract |
A positive electrode material comprising Li, Co, Fe and phosphate, characterized in that it comprises: a positive Li ion electrode material having a nominal stoichiometry of: Li1 + y / 2Co1-xyz-dSizFexMyM'd (PO4) 1 + y / 2 where M is a trivalent cation of Cr, M 'is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and / or Mg, and is in the range of 0.02 <= y <= 0.08, x is in the range of 0.05 <= x <= 0.15, z is in the range of 0 <= z <= 0.10 and d is in the range of 0 < = d <= 0.20. |