Synthesis and reversible lithium storage of Cr2O5 as a new high energy density cathode material for rechargeable lithium batteries

被引：21

作者：

Feng, Xu-Yong ^{[1
]}

Ding, Ning ^{[1
]}

Wang, Li ^{[1
]}

Ma, Xiao-Hang ^{[1
]}

Li, Yong-Ming ^{[1
]}

Chen, Chun-Hua ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Anhui, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2013年 / 222卷

基金：

美国国家科学基金会;

关键词：

Chromium oxide; Ex-situ X-ray diffraction; Energy density; Cyclic voltammogram; Lithium batteries; CHROMIUM OXIDES; ANODE MATERIALS; PERFORMANCE; COMPOSITE; ARRAYS; CR8O21;

D O I：

10.1016/j.jpowsour.2012.08.061

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070305 [高分子化学与物理];

摘要：

Chromium trioxide is calcined from 350 to 400 degrees C yielding pure Cr2O5. The electrochemical properties of the resulting chromium oxides have been measured in the potential range 2.0-4.5 V (vs. Li+/Li) when used in lithium batteries. The first discharge process, the intercalation of lithium into Cr2O5, proceeds via two steps. In the following cycles, lithium is found to be reversibly de-lithiated/lithiated via a solid solution process with an un-known single phase LixCr2O5 (u-phase) characterized by an X-ray diffractive lattice spacing of about 0.20 nm. The sample that results from chromium trioxide being calcined at 350 degrees C shows the highest capacity of 273 mAh g(-1) (the first discharge at 0.5 C rate) and the sample calcined at 400 degrees C shows the best cyclability with the capacity retention of 96% after 100 cycles. The energy density of Cr2O5 can reach 819 Wh kg(-1) with the energy conversion efficiency of 83%. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：184 / 187

页数：4

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