Real-time investigation on the influences of vanadium additives to the structural and chemical state evolutions of LiFePO sub(4) for enhancing the electrochemical performance of lithium-ion battery

The influences of adding vanadium to the structure evolution and electrochemical performance of LiFePO sub(4) are systematically investigated by in-situ X-ray powder diffraction and X-ray absorption near edge structure spectroscopy. The results indicate that the addition of a small amount of vanadiu...

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Bibliographic Details
Published in:Journal of power sources 2014-12, Vol.270, p.449-456
Main Authors: Hu, Chih-Wei, Chen, Tsan-Yao, Shih, Kai-Sheng, Wu, Pin-Jiun, Su, Hui-Chia, Chiang, Ching-Yu, Huang, An-Feng, Hsieh, Han-Wei, Chang, Chia-Chin, Shew, Bor-Yuan, Lee, Chih-Hao
Format: Article
Language:English
Subjects:
Additives
Cathodes
Diffraction
Electrochemical analysis
Evolution
Lithium-ion batteries
Phases
Vanadium
X-rays
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Summary:The influences of adding vanadium to the structure evolution and electrochemical performance of LiFePO sub(4) are systematically investigated by in-situ X-ray powder diffraction and X-ray absorption near edge structure spectroscopy. The results indicate that the addition of a small amount of vanadium (less than at 1%) significantly reduces the formation of non-crystalline (highly disordered) triphylite and remnant heterosite phases in the cathode of battery especially at the rate capability higher than 0.5C. The cycle stability of LiFePO sub(4) cathode with vanadium additive after 80 cycles is improved by 14.9% compared to that without vanadium additive. Such an enhancement could be attributed to the ion diffusion kinetics being improved and inactive triphylite being reduced by the supervalent-vanadium additive in cathode during electrochemical redox cycles.
ISSN:0378-7753
DOI:10.1016/j.jpowsour.2014.07.138