Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 8, Issue 10, Pages 1553-1557Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2006.07.014
Keywords
LiFePO4; doping; Zn; lithium ion battery
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Alien atom doping has been adopted to modify the electrochemical performance of olivine type LiFePO4 for cathode material of the lithium ion batteries. Here, we first report that zinc-doping can improve the performance of LiFePO4. The effects of zinc-doping have been studied by the measurements of X-ray diffraction pattern, scanning electronic microscopy, electrochemical impedance spectroscopy and cyclic voltammetry. The results indicate that the zinc atoms do not destroy the lattice structure of LiFePO4, and enlarge the lattice volume. During de-intercalation and intercalation process of lithium ions, the doped zinc atoms protect the LiFePO4 crystal from shrinking. This kind of pillar effect provides larger space for the movement of lithium ions. Consequently, the conductivity is enhanced and the lithium ion diffusion coefficient is boosted after doping. These favourable changes are beneficial to the improvement of the electrochemical performance of LiFePO4 including discharge capacity and rate capability. (c) 2006 Elsevier B.V. All rights reserved.
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