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New lithium iron pyrophosphate as 3.5 V class cathode material for lithium ion battery.

Journal of the American Chemical Society (2010-09-14)
Shin-ichi Nishimura, Megumi Nakamura, Ryuichi Natsui, Atsuo Yamada
RESUMO

A new pyrophosphate compound Li(2)FeP(2)O(7) was synthesized by a conventional solid-state reaction, and its crystal structure was determined. Its reversible electrode operation at ca. 3.5 V vs Li was identified with the capacity of a one-electron theoretical value of 110 mAh g(-1) even for ca. 1 μm particles without any special efforts such as nanosizing or carbon coating. Li(2)FeP(2)O(7) and its derivatives should provide a new platform for related lithium battery electrode research and could be potential competitors to commercial olivine LiFePO(4), which has been recognized as the most promising positive cathode for a lithium-ion battery system for large-scale applications, such as plug-in hybrid electric vehicles.

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Iron(III) pyrophosphate, soluble crystals