Patent ID: 8722004
Filing Date: 2014-05-13
Classification: C01B

Abstract:
1. A method for the preparation of a lithium phosphate compound with an olivine crystal structure, comprising: (a) providing an aqueous solution containing at least one M metal ion, a lithium ion, a phosphate ion and a nitric acid; (b) adding a soluble reductant and a carbon source to the aqueous solution in Step (a); (c) dehydrating the aqueous solution followed by a self-propagating combustion at 150-300° C.; and (d) heating a combusted product obtained from the self-propagating combustion to promote crystallization of the combusted product, in order to obtain a final product with a complete crystal phase, wherein an amount of the nitric acid added in Step (a) is within 80-120% by weight of the final product; and the soluble reductant in Step (b) is selected from the group consisting of urea (CO(NH