期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 21, 期 -, 页码 58-61出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2012.04.033
关键词
Transmission X-ray microscopy; Li-ion battery; 3D analysis; Nano-tomography and computed tomography
资金
- Royal Academy of Engineering
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
Lithium vanadium oxide (LiVO21) holds the potential promise to replace graphite as an anode material in commercial Li-ion batteries as it doubles the volumetric energy density compared to graphite but can still operate at low voltage (similar to 0.1 V vs. Li/Li+). Its degradation mechanism was investigated using a synchrotron X-ray nano-tomography technique to image the LiVO2 in three dimensions (3D). In particular an oxidation effect is discussed by a direct visualization and quantification of the 3D microstructure of the LiVO2 before and after being exposed to the air, which results in the oxidation of the LiVO2. After being exposed to air, an oxidation layer with thickness similar to 120-240 nm was observed at the interface of the LiVO2 particles and the binders/pores. While the total volume of LiVO2 remains relatively constant before and after oxidation, the particle size reduces, which is consistent with crack growth possibly due to the local exothermal oxidation reactions, accompanied by phase transition at an elevated temperature. The findings confirm the air-sensitivity of LiVO2 observed indirectly in the literature. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据