Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 153, Issue 12, Pages A2282-A2286Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.2360769
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The demand for rechargeable lithium batteries, which have ushered in the wireless revolution and have found a place in the hybrid electric vehicle, is rapidly expanding. Commercial use commonly requires high power, high energy density, and high rate capability. However, achieving a high capacity at a high charge/discharge rate has proven difficult. In this paper, we show a remarkable improvement in the rate capability and capacity of cathodes using carbon-coated LiFePO4 by replacing the carbon plus Teflon additives with polypyrrole (PPy) bonded to the oxide particles by the carbon coat. An excellent charge/discharge performance at a rate as high as 10C, and even a 3 min (20C) charge, is demonstrated with a C-LiFePO4/PPy cathode containing 16 wt % PPy. Attaching a conductive polymer to an active oxide particle is a general strategy that also promises to enhance the rate capability of other cathode composites used in rechargeable lithium batteries. (c) 2006 The Electrochemical Society.
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