Capacitive Energy Storage on Fe/Li3PO4 Grain Boundaries

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• 作者：Xianwei Guo ; Xiangpeng Fang ; Ya Mao ; Zhaoxiang Wang ; Feng Wu ; Liquan Chen
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：March 10, 2011
• 年：2011
• 卷：115
• 期：9
• 页码：3803-3808
• 全文大小：1006K
• 年卷期：v.115,no.9(March 10, 2011)
• ISSN：1932-7455

文摘

Energy storage was realized on the interfaces between Fe and Li₃PO₄ nanograins in situ fabricated by discharging commercial LiFePO₄ to 0.005 V vs Li⁺/Li. X-ray diffraction and high-resolution transmission electron microscopy indicate that both the metallic Fe and Li₃PO₄ nanocrystallites are stable up to 4.2 V. The solid electrolyte interphase layer on the nanocomposite does not decompose until 1.7 V according to infrared spectroscopic analysis. The Fe/Li₃PO₄ nanocomposite stores up to 220 mAh g^鈭? of lithium without any electrochemical reactions. This is a purely lithium storage behavior distinct from that on the electrodes of supercapacitors or traditional secondary batteries.