期刊
MICROSCOPY
卷 64, 期 3, 页码 159-168出版社
OXFORD UNIV PRESS
DOI: 10.1093/jmicro/dfv003
关键词
scanning electron microscope; ionic liquid; in situ SEM observation; negative electrode; silicon; lithium-ion battery
类别
资金
- Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) [24350071]
- Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [15K13287] Funding Source: KAKEN
By exploiting characteristics such as negligible vapour pressure and ion-conductive nature of an ionic liquid (IL), we established an in situ scanning electron microscope (SEM) method to observe the electrode reaction in the IL-based Li-ion secondary battery (LIB). When 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)amide ([C(2)mim][FSA]) with lithium bis(trifluoromethanesulfonyl) amide (Li[TFSA]) was used as the electrolyte, the Si negative electrode exhibited a clear morphology change during the charge process, without any solid electrolyte interphase (SEI) layer formation, while in the discharge process, the appearance was slightly changed, suggesting that a morphology change is irreversible in the charge-discharge process. On the other hand, the use of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide ([C(2)mim][TFSA]) with Li[TFSA] did not induce a change in the Si negative electrode. It is interesting to note this distinct contrast, which could be attributed to SEI layer formation from the electrochemical breakdown of [C(2)mim](+) at the Si negative electrode vertical bar separator interface in the [C(2)mim][TFSA]based LIB. This in situ SEM observation technique could reveal the effect of the IL species electron-microscopically on the Si negative electrode reaction.
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