Patent ID: 8486296

Claim:
A process for preparing a battery grade formulation comprising a carbon-deposited alkali metal phosphate, said process comprising a milling step of the carbon-deposited alkali metal phosphate C-A a M m (XO 4 ) x in the form of strong agglomerates, wherein the strong agglomerates are obtained by a process comprising a dry high-energy ball milling of precursors of the carbon-deposited alkali metal phosphate: wherein C-A a M m (XO 4 ) x is composed of particles of a compound corresponding to the general formula A a M m (XO 4 ) x which have an olivine structure and which carry, on at least a portion of their surface, carbon deposited by a thermal process, the general formula A a M m (XO 4 ) x being such that: A represents Li, alone or partially replaced by at most 20% as atoms of Na and/or K, and 0<a≦8; M comprise at least 50% at, of Fe(II) or Mn(II) or mixture thereof, and 1≦m≦3; and XO 4 represents PO 4 , alone or partially replaced by at most 30 mol % of at least one group chosen from SO 4 and SiO 4 , and 0<x≦3; wherein M, X, a, m and x are selected as to maintain electroneutrality of said compound; and wherein said milling step is performed in the presence of a solvent used for battery electrode coating.