抄録
Operando scanning transmission electron microscopy observations of cathodic reactions in a liquid-cell Li–O2 microbattery in the presence of the redox mediator tetrathiafulvalene (TTF) in 1.0 m LiClO4 dissolved dimethyl sulfoxide electrolyte are reported. It is found that the TTF addition does not obviously affect the discharge reaction for the formation of a solid Li2O2 phase. The coarsening of Li2O2 nanoparticles occurs via both conventional Ostwald ripening and nonclassical crystallization by particle attachment. During charging, the oxidation reaction at significantly reduced charge potentials mainly takes place at Li2O2/electrolyte interfaces and has obvious correspondence with the oxidized TTF+ distributions in the electric fields of the charged electrode. This study provides direct evidence that TTF truly plays a role in promoting the decomposition of Li2O2 as a soluble charge-transfer agent between the electrode and the Li2O2.
本文言語 | English |
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論文番号 | 1702752 |
ジャーナル | Advanced Materials |
巻 | 29 |
号 | 41 |
DOI | |
出版ステータス | Published - 2017 11月 6 |
外部発表 | はい |
ASJC Scopus subject areas
- 材料科学(全般)
- 材料力学
- 機械工学