Electronically conductive phospho-olivines as lithium storage electrodes

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Lithium transition metal phosphates have become of great interest as storage cathodes for rechargeable lithium batteries because of their high energy density, low raw materials cost, environmental friendliness and safety. Their key limitation has been extremely low electronic conductivity, until now believedto be intrinsic to this family of compounds. Here we show that controlled cation non-stoichiometry combined with solid-solution doping by metals supervalent to Li+ increases the electronic conductivity of LiFePO4 by a factor of similar to10(8). The resulting materials show near-theoretical energy density at low charge/discharge rates, and retain significant capacity with little polarization at rates as high as 6,000 mA g(-1). In a conventional cell design, they may allow development of lithium batteries with the highest power density yet.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2002-10
Language
English
Article Type
Article
Citation

NATURE MATERIALS, v.1, no.2, pp.123 - 128

ISSN
1476-1122
DOI
10.1038/nmat732
URI
http://hdl.handle.net/10203/261945
Appears in Collection
EEW-Journal Papers(저널논문)
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