Energy storage material, amorphous coating, lithium ion battery, lithium iron phosphate, charge discharge rate, cyclability, in-situ surface coating, olivine material, ex-situ coating material, non-stoichiometry, surface coating material
Energy storage devices such as lithium ion batteries
Improving charge retention and charge/ discharge rates of LiMPO4 materials through coatings
This invention describes a method to make nano-sized active materials of iron-based phosphates with an ion and electron conducting coating. The coating, consisting of an amorphous or microcrystalline glass of Li-P-O-N-Fe, is a stable ionic and electronic conductor. It adheres well to lithium metal phosphate particles, and can be applied in-situ (during synthesis of the material) or ex-situ (after synthesis). The in-situ or ex-situ method is applied to improve electrochemical performance of olivine electrode materials. This novel coating improves the performance, much more than with carbon, of rechargeable lithium ion batteries. The materials synthesized by the surface coating show superior performance in terms of cyclability, rate capability and capacity retention.
U.S. Patent Application Number 12/449116, filed on December 28, 2009
PCT Patent Application Number US08/001052, filed on January 25, 2008
Last revised: January 18, 2012
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