点击次数：

DOI码：10.1038/s41467-019-12310-6

发表刊物：Nature Communications

关键字：X-RAY-ABSORPTION；POSITIVE ELECTRODE；CRYSTAL-STRUCTURE；VANADIUM SULFIDE；SULFUR；CHEMISTRY；CATHODES；SPECTROSCOPY；CHALLENGES；MOSSBAUER

摘要：The use of anion redox reactions is gaining interest for increasing rechargeable capacities in alkaline ion batteries. Although anion redox coupling of S2- and (S-2)(2-) through dimerization of S-S in sulfides have been studied and reported, an anion redox process through electron hole formation has not been investigated to the best of our knowledge. Here, we report an O3-NaCr2/3Ti1/3S2 cathode that delivers a high reversible capacity of similar to 186 mAh g(-1) (0.95 Na) based on the cation and anion redox process. Various charge compensation mechanisms of the sulfur anionic redox process in layered NaCr2/3Ti1/3S2, which occur through the formation of disulfide-like species, the precipitation of elemental sulfur, S-S dimerization, and especially through the formation of electron holes, are investigated. Direct structural evidence for formation of electron holes and (S2)(n-) species with shortened S-S distances is obtained. These results provide valuable information for the development of materials based on the anionic redox reaction.

合写作者：Guo-Xi Ren, Ji-Li Yue, Yi-Fei Mo, Xi-Qian Yu, Ming-Hui Cao, Zulipiya Shadike

第一作者：Tian Wang

通讯作者：Pan Liu,Xiaosong Liu,Zheng-Wen Fu

论文编号：4458

卷号：10

ISSN号：2041-1723

是否译文：否

发表时间：2019-10-01

发布期刊链接：https://www.nature.com/articles/s41467-019-12310-6