阳极
锂(药物)
二硫化钼
材料科学
纳米复合材料
电化学
石墨烯
化学工程
碳纤维
相(物质)
插层(化学)
储能
纳米技术
电极
无机化学
化学
复合材料
复合数
有机化学
物理化学
功率(物理)
内分泌学
工程类
物理
量子力学
医学
作者
Mohamed M. Abdelaal,Chun–Chen Yang,Tai‐Feng Hung
标识
DOI:10.1016/j.est.2023.109926
摘要
The metallic phase of molybdenum disulfide (1T-MoS2) shows distinct advantages for lithium storage owing to its superior electronic conductivity, abundance of electroactive sites, and wider interplanar spacing compared to the semiconducting phase (2H-MoS2). However, investigating lithium storage in 1T-MoS2 encounters significant challenges attributed to its thermodynamic instability during synthesis and its transformation to an amorphous structure following the irreversible conversion reaction. This study addresses these challenges by utilizing hierarchical porous activated carbon (HPAC) to achieve the highest reported proportion (85 %) of 1T-MoS2 and by restricting the potential window to induce selective intercalation reaction. Impressively, 1T-MoS2/HPAC anodes exhibit a reversible capacity that surpasses the theoretical capacity (167 mAh/g) at various current densities from 0.1 to 2.0 A/g. This superior performance extends even after 100 cycles, retaining a capacity of 276 mAh/g at 0.1 A/g. The kinetic analysis indicates that the additional capacity originated from non-Faradic lithium storage, reaching 96 % at 5.0 mV/s. Further studies employing ex-situ XRD and in-situ EIS at various lithiation depths unveil the formation of a novel permanent phase after lithiation, characterized by expanded interlayer spacing and improved conductivity compared to the un-lithiated material. These findings open promising avenues for developing anode materials for lithium-ion batteries/capacitors applications.
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