期刊
SOLID STATE IONICS
卷 335, 期 -, 页码 7-14出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2019.02.010
关键词
All-solid-state lithium battery; Thin-film battery; Lithium cobalt oxide; Pulsed laser deposition; In situ Raman spectroscopy; Structural change of LixCoO2
资金
- JSPS KAKENHI [22750164, 24550206]
- MEXT (Ministry of Education, Culture, Sports, Science and Technology), Japan
- JST ALCA-SPRING (Specially Promoted Research for Innovative Next Generation Batteries) Project, JSPS KAKENHI [17K19134]
- Murata Science Foundation
- Grants-in-Aid for Scientific Research [24550206, 22750164, 17K19134] Funding Source: KAKEN
A thin-film battery was fabricated in the structure Li/Li3PO4/LiCoO2 using pulsed laser deposition technique. The structural change in LixCoO2 during battery operation was investigated using in situ Raman spectroscopy. Raman measurements were performed from the front side of the cell beside the lithium anode through the solid electrolyte and from the backside of the cell below the lithium anode through a transparent electrode. The Raman peaks of A(1g) and E-g modes were observed to shift to lower and higher wavenumbers at around 4 V due to Li extraction and insertion, respectively, according to the structural change between H1 and H2 phases of the LixCoO2. The Raman shift for the LixCoO2 showed hysteresis during the charging-discharging process when observed from the front side of the cell, although no hysteresis is seen in those measured from the backside. The observed hysteresis is explained as a delay in structural change due to the chemical diffusion of lithium in the LixCoO2 cathode.
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