journal article·2015-01-27

Phase Transitions in a LiMn2O4 Nanowire Battery Observed by Operando Electron Microscopy

Soyeon Lee, Yoshifumi Oshima, Eiji Hosono, Haoshen Zhou, Kyungsu Kim, Hansen M. Chang, Ryoji Kanno, Kunio Takayanagi

ACS Nano· Volume 9· Issue 1
Publisher page

Abstract

Fast charge-discharge process has been reported to give a high capacity loss. A nanobattery consisting of a single LiMn2O4 nanowire cathode, ionic liquid electrolyte and lithium titanium oxide anode was developed for in situ transmission electron microscopy. When it was fully charged or discharged within a range of 4 V in less than half an hour (corresponding average C rate: 2.5C), Li-rich and Li-poor phases were observed to be separated by a transition region, and coexisted during whole process. The phase transition region moved reversibly along the nanowire axis which corresponds to the [011] direction, allowing the volume fraction of both phases to change. In the electron diffraction patterns, the Li-rich phase was seen to have the (100) orientation with respect to the incident electron beam, while the Li-poor phase had the (111̅) orientation. The orientation was changed as the transition region moved. However, the nanowire did not fracture. This suggests that a LiMn2O4 nanowire has the advantage of preventing capacity fading at high charge rates.
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Research context

OpenAlex topics: Advancements in Battery Materials · Advanced Battery Technologies Research · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Quantum Nanoelectronics Research Center, Tokyo Institute of Technology, 2-12-1-H-52 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan

JST−CREST, 7-gobancho, Chiyoda-ku, Tokyo 102-0075, Japan

School of Materials Science I, Japan Advanced Institute of Science and Technology, 1-1 M1-61 Asahidai, Nomi, Ishikawa 923-1292, Japan

Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, 305-8568, Japan

Department of Electronic Chemistry, Tokyo Institute of Technology, 4259 G1-1 Nagatsuta, Midori-ku, Yokohama 226-8502, Japan

Department of Physics, Tokyo Institute of Technology, 2-12-1-H-51 Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan

Funding

Core Research for Evolutional Science and Technology, Japan Science and Technology Agency

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