| US 7,390,472 B1 | ||
| Method of making nanostructured lithium iron phosphate—based powders with an olivine type structure | ||
| Amit Singhal, Piscataway, N.J. (US); and Ganesh Skandan, Piscataway, N.J. (US) | ||
| Assigned to NEI Corp., Piscataway, N.J. (US) | ||
| Filed on Oct. 28, 2003, as Appl. No. 10/695,520. | ||
| Claims priority of provisional application 60/421840, filed on Oct. 29, 2002. | ||
| Int. Cl. C01B 25/26 (2006.01) | ||
| U.S. Cl. 423—306 [252/518.1; 252/502; 423/179.5; 429/218.1; 429/221] | 16 Claims |
| 1. A method of producing olivine type nanostructured lithium metal phosphate of the formula, LiFexM1-xPO4, where 1≤x≤0.1 and M is a metal cation and having an olivine structure, comprising the following steps:
(a) dispersing iron dextran nanoparticles in a liquid solution,
(b) at least one of the steps of: 1) dissolving a metal salt in the liquid solution and 2) dispersing metal oxide nanoparticles
in the liquid solution,
(c) dissolving a phosphate ion containing chemical precursor in the liquid solution,
(d) dissolving a lithium containing salt in the liquid solution,
(e) heating the solution to promote the precipitation of LiFexM1-xPO4 precursor material,
(f) evaporating the liquid and calcining the LiFexM1-xPO4 precursor material for removing volatiles, and
(g) annealing the LiFexM1-xPO4 precursor material to form the olivine type nanostructured LiFexM1-xPO4 compound.
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