Alkali metal oxyanion electrode material having a carbon deposited by pyrolysis and process for making same
AssigneeClariant GmbH
InventorsGuoxian Liang, Steeve Rousselot, Jasmin Dufour
Life of this patent
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Abstract
An alkali metal oxyanion cathode material comprising particles, where the particles carry, on at least a portion of the particle surface, carbon deposit by pyrolysis is described. The particles have the general formula A:M:M′:XO4 where the average valency of M is +2 or greater; A is at least one alkali metal selected from Li, Na and K; M is at least Fe and/or Mn; and M′ is a metal of valency of 2+ or more.
Claims6
An alkali metal oxyanion cathode material comprising particles, where the particles carry, on at least a portion of the particle surface, carbon deposited by pyrolysis wherein the particles have the general formula A:M:M′:XO4, wherein
- A is at least one alkali metal selected from Li, Na and K;
- M is at least Fe and/or Mn, wherein the average valence of M is +2 or greater, and wherein M can be substituted by at most 15% at. of one or more metal at oxidation levels between +1 and +5;
- M′ is a metal of valence of 2+ or more;
- XO4 is PO4 and/or SiO4, and can be partly substituted by another XO4, in which X is either P, S, V, Si, Nb, Mo or any combinations thereof,
- wherein the elements in the general formula A:M:M′:XO4 are present in the following general ratios 1:0.95-0.98:0.02 to <0.05:1.
A process for making an alkali metal oxyanion cathode material comprising particles, where the particles carry, on at least a portion of the particle surface, a carbon coating deposited by pyrolysis, said process comprising
- performing a thermal step of high-energy milled precursors of the cathode material, wherein at least a part of the thermal step is performed under an atmosphere comprising a carbonaceous chemical and/or an organic chemical comprising carbon.
Dependencies are inferred from the claim text.