期刊
CHEMICAL ENGINEERING JOURNAL
卷 451, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138891
关键词
Antimony sulfide; MXene framework; Interfacial bonding; Electrolyte chemistry; Potassium ion batteries
A unique MXene-wrapped Sb2S3 nanocomposite (Sb2S3@MXene) with robust interfacial characteristics was designed as an anode material for potassium ion batteries. It showed enhanced charge transfer, restrained agglomeration, and reduced volume expansion during cycling, leading to improved cycle and rate performance. The high-concentrated KFSI-DME electrolyte also played a positive role, forming a stable solid electrolyte interphase layer and enhancing the stability of the electrode.
Antimony sulfide (Sb2S3) is a promising high-capacity anode material for potassium ion batteries but suffers from intrinsic low electronic conductivity and large volume variation during cycling due to the large size of potassium ion, resulting in poor cycle and rate performance. Here, a unique MXene-wrapped Sb2S3 nanocomposite (Sb2S3@MXene) with robust interfacial Sb-O-Ti bonding was designed as an anode material for PIBs, where the metallic MXene framework and interfacial Sb-O-Ti bonding can promote the charge transfer of the Sb2S3@MXene, restrain the nano-Sb2S3 agglomeration, and alleviate the volume expansion of Sb2S3 during potassiation. Moreover, the positive effect of high-concentrated 5 M KFSI-DME electrolyte was revealed through X-ray photoelectron spectroscopy, Raman spectroscopy, and density functional theory simulation, which can form a robust inorganic-rich solid electrolyte interphase layer on the electrode surface, enhancing the stability of the electrode. The robust interfacial characteristics between MXene, Sb2S3, and electrolyte endow the Sb2S3@MXene with boosted potassium storage performances, which delivered a high reversible capacity of 399.7 mAh g-1 at 100 mA g � 1, excellent cycle stability (422.1 mAh g-1 after 100 cycles), and superior rate capability (119.0 mAh g-1 at 2 A g-1), demonstrating its great potential as an anode material for PIBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据