Experimental visualization of lithium diffusion in LixFePO4

被引:652
作者
Nishimura, Shin-ichi [1 ]
Kobayashi, Genki [1 ]
Ohoyama, Kenji [2 ]
Kanno, Ryoji [1 ]
Yashima, Masatomo [3 ]
Yamada, Atsuo [1 ]
机构
[1] Tokyo Inst Technol, Interdisciplinary Grad Sch Sci & Engn, Dept Elect Chem, Midori Ku, Yokohama, Kanagawa 2268502, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[3] Tokyo Inst Technol, Interdisciplinary Grad Sch Sci & Engn, Dept Mat Sci & Engn, Midori Ku, Yokohama, Kanagawa 2268502, Japan
基金
日本学术振兴会;
关键词
D O I
10.1038/nmat2251
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Chemical energy storage using batteries will become increasingly important for future environmentally friendly ('green') societies. The lithium-ion battery is the most advanced energy storage system, but its application has been limited to portable electronics devices owing to cost and safety issues(1). State-of-the-art LiFePO4 technology as a new cathode material with surprisingly high charge-discharge rate capability has opened the door for large-scale application of lithium-ion batteries such as in plug-in hybrid vehicles(2-5). The scientific community has raised the important question of why a facile redox reaction is possible in the insulating material(6-14). Geometric information on lithium diffusion is essential to understand the facile electrode reaction of LixFePO4 (0 < x < 1), but previous approaches have been limited to computational predictions(15,16). Here, we provide long-awaited experimental evidence for a curved one-dimensional chain for lithium motion. By combining high-temperature powder neutron diffraction and the maximum entropy method, lithium distribution along the [010] direction was clearly visualized.
引用
收藏
页码:707 / 711
页数:5
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