Cathode materials for secondary (rechargeable) lithium batteries
AssigneeHydro-Quebec
InventorsJohn B. Goodenough, Akshaya K. Padhi, Kirakoda S. Nanjundaswamy, Christian Masquelier
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Abstract
The invention relates to materials for use as electrodes in an alkali-ion secondary (rechargeable) battery, particularly a lithium-ion battery. The invention provides transition-metal compounds having the ordered-olivine or the rhombohedral NASICON structure and the polyanion (PO4)3− as at least one constituent for use as electrode material for alkali-ion rechargeable batteries.
Claims18
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.
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.
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
- electrochemically extracting lithium ions from the LiFePO4 to form the delithiated olivine FePO4 compound.
Dependencies are inferred from the claim text.