Capacitive Energy Storage on Fe/Li3PO4 Grain Boundaries
Capacitive Energy Storage on Fe/Li3PO4 Grain Boundaries
复制标题
Fe/Li3PO4 晶界上的电容储能
DOI：
10.1021/jp111015j
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发表时间：
2011-03-10
影响因子：
3.7
通讯作者：
Chen, Liquan
中科院分区：
文献类型：
--
作者：
Guo, Xianwei;Fang, Xiangpeng;Chen, Liquan
通过将商用LiFePO4放电到0.005 V对Li+/Li进行放电，在Fe和Li3PO4纳米颗粒之间的界面上实现了储能。X射线衍射仪和高分辨电子显微镜分析表明，金属Fe和Li3PO4纳米晶在4.2V以下稳定。红外光谱分析表明，纳米复合材料上的固体电解质界面层直到1.7V才开始分解。Fe/Li3PO4纳米复合材料在没有任何电化学反应的情况下储存了高达220mAHg(-1)的锂。这是一种纯粹的锂存储行为，不同于超级电容器或传统二次电池的电极上的存储行为。
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(-1) 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.