Journal
ELECTROCHIMICA ACTA
Volume 51, Issue 10, Pages 2063-2067Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2005.07.014
Keywords
lithium ion battery; cathode materials; lithium iron phosphates; mix-doping; electronic conductivity
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The Li(0.98)Al(0.02)FePO(4)/C (2.0 wt.%) mix-doped composite had been synthesized by adding aluminum stearate to the react precursors through solid-state reaction. The mix-doping method does not affect the olivine structure of the cathode but greatly improves its kinetics in terms of capacity delivery, cycle life and rate capability. Such an enhancement of the electrochemical properties has been ascribed to the increase of intra- and inter-crystal electronic conductivity and the reduction of the particle size, these two effects being promoted by the co-existence of the lattice doping element (Al(3+)) and the non-lattice doping element (C). Overcharge test indicates that this composite has excellent safety performances. (c) 2005 Elsevier Ltd. All rights reserved.
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