材料科学
阳极
法拉第效率
电解质
静电纺丝
锂(药物)
共价键
降级(电信)
离子
化学工程
纳米技术
复合材料
电极
聚合物
电气工程
物理
医学
化学
物理化学
工程类
量子力学
内分泌学
作者
Jian Lin,Yanfei Li,Yi‐Han Song,Jingping Zhang,Haiming Xie,Haizhu Sun
出处
期刊:Nanotechnology
[IOP Publishing]
日期:2023-07-19
卷期号:34 (40): 405402-405402
被引量:1
标识
DOI:10.1088/1361-6528/ace1f8
摘要
Abstract Although significant achievements in improving the stability of MoS 2 anodes have been made, the cycling life in most studies is still less than 1000 cycles. This is because MoS 2 anodes directly contact the electrolyte and generate byproducts, leading to the loss of active mass and capacity decay. Herein, the inner–outer dual space protection of MoS 2 fibers is realized by regulating the surface and interface structure of electrospinning precursors (noted as X-MoS 2 /CNFs). Inside the fibers, Mo–N covalent bond is constructed to anchor the active material, preventing MoS 2 from falling off the matrix after multiple cycles. Simultaneously, surface of the fibers, a stable solid electrolyte interface layer is induced to prevent contact between active materials and electrolytes. In addition, the initial Coulombic efficiency is enhanced as high as 84.4%. The profound investigations of morphological evolution and internal real-time resistance confirm the double structural protection of 800-MoS 2 /CNFs. As a result, a decent cycling performance (408.9 mAh g −1 at 1000 mA g −1 for 2000 cycles) and the satisfied rate capacities (100–1000 mA g −1 ) are achieved. This work provides a new idea for the preparation of stable anodes for alkali metal ion secondary batteries.
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