An investigation of polypyrrole-LiFePO4 composite cathode materials for lithium-ion batteries |
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| Authors: | G.X. Wang L. Yang Y. Chen J.Z. Wang Steve Bewlay H.K. Liu |
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| Affiliation: | Energy Storage Materials Research Programme, Institute for Superconducting and Electronic Materials, University of Wollongong, NSW 2500, Australia |
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| Abstract: | A series of polypyrrole-LiFePO4 (PPy-LiFePO4) composites were synthesised by polymerising pyrrole monomers on the surface of LiFePO4 particles. AC impedance measurements show that the coating of polypyrrole significantly decreases the charge-transfer resistance of LiFePO4 electrodes. The electrochemical reactivity of polypyrrole and PPy-LiFePO4 composites for lithium insertion and extraction was examined by charge/discharge testing. The PPy-LiFePO4 composite electrodes demonstrated an increased reversible capacity and better cyclability, compared to the bare LiFePO4 electrode. |
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| Keywords: | Polypyrrole Lithium iron phosphate Lithium-ion batteries AC impedance |
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