Journal
JOURNAL OF POWER SOURCES
Volume 193, Issue 2, Pages 841-845Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2009.03.061
Keywords
LiFePO4; Cathode material; Lithium-ion batteries; V-doping
Funding
- 863 Program [2007AA03Z225]
- 973 Program [2009CB220100]
- Tianjin NSF, China [06YFJMJC13300]
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V-doped LiFePO4/C cathode materials were prepared through a carbothermal reduction route. The microstructure was characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The electrochemical Li+ intercalation performances of V-doped LiFePO4/C were compared with those of undoped one through galvanostatic intermittent titration technique, cyclic voltamperometry, and electrochemical impedance spectrurn. V-doped LiFePO4/C showed a high discharge capacity of similar to 70 mAh g(-1) at the rate of 20 C (3400 mA g(-1)) at room temperature. The significantly improved high-rate charge/discharge capacity is attributed to the increase of Li+ ion effective diffusion capability. (C) 2009 Elsevier B.V. All rights reserved.
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