CATHODE MATERIALS COMPRISING RHOMBOHEDRAL NASICON FOR SECONDARY (RECHARGEABLE) LITHIUM BATTERIES

摘要

The invention relates to a method of preparing LiFePO4 having an olivine structure comprising: mixing stoichiometric proportions of a source of lithium, a source of iron, and a source of phosphorus to form a source mixture; heating the source mixture to a temperature and for a period of time sufficient to allow a solid--state reaction to occur so as to form LiFePO4 having an olivine structure. The invention also relates to a method of preparing a delithiated olivine FePO4 compound comprising: mixing stoichiometric proportions of a source of lithium, a source of iron, and a source of phosphorus to form a source mixture; heating the source mixture to a temperature and for a period of time sufficient to allow a solid-state reaction to occur so as to form LiFePO4 having an olivine structure; and chemically extracting lithium ions from the LiFePO4 to form the delithiated olivine FePO4 compound.