Method for production of Li2MSiO4 electrode materials

摘要

A process for the production of Li2MSiO4 where M is selected from the group Fe, Mn, Co, and Ni, is disclosed. The process uses an atmospheric-pressure solvothermal synthesis and a calcining step wherein the solvent is selected to be stable from decomposition over the solvothermal process conditions. The solvothermal solvent is recoverable and reusable. The process also relies on an excess of lithium in the starting materials mix to promote phase-purity of the Li2MSiO4 crystalline phase. The Li2MSiO4 material is used as a cathode material in a lithium ion battery cell.

主权项

1. A battery electrode, comprising Li2MSiO4 material, wherein the Li2MSiO4 material is prepared by a method comprising:
(a) forming a mixture comprising a high boiling alcohol, a source of Li ions, a source of metal ions (M), and a source of Si, wherein the molar ratio of Li to M and/or Si ranges from about 2.2 to about 2.8; (b) heating the mixture of step (a), thereby forming a solid reaction product and a supernatant; (c) separating the solid reaction product from the supernatant; and (d) calcining the solid reaction product obtained from step (c) to produce Li2MSiO4.