Direct Observations of the Formation and Redox‐Mediator‐Assisted Decomposition of Li2O2 in a Liquid‐Cell Li–O2 Microbattery by Scanning Transmission Electron Microscopy,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Direct Observations of the Formation and Redox‐Mediator‐Assisted Decomposition of Li2O2 in a Liquid‐Cell Li–O2 Microbattery by Scanning Transmission Electron Microscopy
Advanced Materials ( IF 27.4 ) Pub Date : 2017-09-11 , DOI: 10.1002/adma.201702752
Chuchu Yang ₁ , Jiuhui Han ₁ , Pan Liu _{1,

2} , Chen Hou ₂ , Gang Huang ₁ , Takeshi Fujita ₁ , Akihiko Hirata ₁ , Mingwei Chen _{1,

2,

3,

4}

Affiliation

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.

中文翻译：

通过扫描透射电子显微镜直接观察液态电池Li-O2微电池中Li2O2的形成和氧化还原介体辅助的分解

据报道，在1.0 m LiClO ₄溶解的二甲基亚砜电解质中存在氧化还原介体四硫富瓦烯（TTF）的情况下，在液体电池Li–O ₂微型电池中进行阴极反应的Operando扫描透射电镜观察到了报道。发现添加TTF对形成固态Li ₂ O ₂相的放电反应没有明显影响。Li ₂ O ₂纳米颗粒的粗化通过常规的奥斯特瓦尔德熟化和通过颗粒附着的非经典结晶而发生。在充电过程中，在明显降低的充电电位下的氧化反应主要发生在Li ₂ O处₂ /电解质界面并且与带电电极的电场中的氧化的TTF ⁺分布具有明显的对应关系。这项研究提供了直接的证据，即TTF确实在促进Li ₂ O ₂的分解中发挥作用，Li ₂ O ₂是电极和Li ₂ O ₂之间的可溶性电荷转移剂。

更新日期：2017-09-11

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11