Vanadium Substitution of LiFePO4 Cathode Materials To Enhance the Capacity of LiFePO4-Based Lithium-Ion Batteries

详细信息    查看全文

• 作者：Ching-Yu Chiang ; Hui-Chia Su ; Pin-Jiun Wu ; Heng-Jui Liu ; Chih-Wei Hu ; Neeraj Sharma ; Vanessa K. Peterson ; Han-Wei Hsieh ; Yu-Fang Lin ; Wu-Ching Chou ; Chih-Hao Lee ; Jyh-Fu Lee ; Bor-Yuan Shew
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：November 26, 2012
• 年：2012
• 卷：116
• 期：46
• 页码：24424-24429
• 全文大小：387K
• 年卷期：v.116,no.46(November 26, 2012)
• ISSN：1932-7455

文摘

The mechanism of enhancing the capacity of the LiFePO₄ cathodes in lithium ion batteries by the addition of a small amount of vanadium, which locate on the lithium site and induce lithium vacancies in the crystal structure, is reported in this article. As a result, the capacity increases from 138 mAh/g found for pristine LiFePO₄ to 155 mAh/g for the V-added compound, and the conductivity increases from 4.75 脳 10^鈥? S/cm for the LiFePO₄ without V addition to 1.9 脳 10^鈥?S/cm for the V-added compound. A possible model to facilitate the enhancement of conductivity and capacity is described with evidence supported by X-ray powder diffraction, X-ray absorption spectroscopy, and neutron powder diffraction data.