电极
离子
材料科学
纳米技术
化学工程
化学
工程类
物理化学
有机化学
作者
Tariqul Islam,Subrata Chandra Roy,Sahar Bayat,Misganaw Adigo Weret,Justin M. Hoffman,K.R.P.M. Rao,Conrad Sawicki,Jing Nie,Robiul Alam,Oluwaseun Oketola,Carrie L. Donley,Amar Kumbhar,Renfei Feng,Kamila M. Wiaderek,Chad Risko,Ruhul Amin,Saiful M. Islam
标识
DOI:10.1002/cssc.202400084
摘要
Despite large theoretical energy densities, metal‐sulfide electrodes for energy storage systems face several limitations that impact the practical realization. Here, we present the solution‐processable room temperature (RT) synthesis, local structures, and application of a sulfur‐rich Mo3S13 chalcogel as a conversion‐based electrode for lithium‐sulfide batteries (LiSBs). The structure of the amorphous Mo3S13 chalcogel is derived through operando Raman spectroscopy, synchrotron X‐ray pair distribution function (PDF), X‐ray absorption near edge structure (XANES), and extended X‐ray absorption fine structure (EXAFS) analysis, along with ab initio molecular dynamics (AIMD) simulations. A key feature of the three‐dimensional (3D) network is the connection of Mo3S13 units through S‐S bonds. Li/Mo3S13 half‐cells deliver initial capacity of 1013 mAh g‐1 during the first discharge. After the activation cycles, the capacity stabilizes and maintains 312 mAh g‐1 at a C/3 rate after 140 cycles, demonstrating sustained performance over subsequent cycling. Such high‐capacity and stability are attributed to the high density of (poly)sulfide bonds and the stable Mo‐S coordination in Mo3S13 chalcogel. These findings showcase the potential of Mo3S13 chalcogels as metal‐sulfide electrode materials for LiSBs.
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