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High power electrode materials

  • US 9,954,228 B2
  • Filed: 07/27/2016
  • Issued: 04/24/2018
  • Est. Priority Date: 09/18/2009
  • Status: Active Grant
First Claim
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1. A method to form an ammonium iron phosphate for use to make an electrode active material, comprising:

  • (a) introducing an iron (II) salt, a phosphate source, an ammonium source, and an oxidizing agent into an aqueous solution to form a mixture;

    (b) filtering the mixture to recover a solid by-product;

    (c) re-dispersing the solid by-product into an aqueous solution;

    (d) heating the aqueous solution;

    (e) filtering the solution to recover a solid; and

    (f) drying the solid to obtain a high purity spheniscidite with a formula of NH4Fe2(PO4)2OH.2H2O.

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