阳极
过渡金属
金属
钠
离子
材料科学
氧化还原
化学工程
熵(时间箭头)
电极
化学
热力学
无机化学
冶金
催化作用
物理化学
物理
工程类
有机化学
生物化学
作者
Yongsheng Zhang,Jiang yuan Xing,Mengyu Chen,Qianzheng Jin
标识
DOI:10.1016/j.cej.2023.147709
摘要
Metal diselenides-based anode materials for sodium ion batteries have attracted great attention owing to their high theoretical capacity and excellent conductivity. However, some critical issues such as notorious soluble polyselenides shuttle and volumetric expansion extremely limit their application in SIBs. Herein, the high-entropy strategy is applied to this material through embedding Mn, Co, Ni, Fe and Cu elements into the same position in the octahedron structure. Consequently, the as-prepared high-entropy metal diselenides (HE-MSe2) electrode with multiple transition metals can exhibit an enhanced chemical affinity to soluble polyselenides and its specific structure can restrain volumetric expansion. Besides, Cu2Se was produced by an in-situ immobilization reaction between the caught sodium polyselenides and Cu current collector, and the obtained Cu2Se can not only mitigate the shuttle effect, but also contribute to the specific capacity. Moreover, theoretical simulations reveal that the HE-MSe2 shows increased binding energy with sodium ions and fast reaction kinetics, in which multiple transition metal facilitates the anchoring of polyselenides. Benefiting from these advantages, the HE-MSe2 anode presents a high reversible capacity of 440 mAh g−1 at 0.1 A g−1 and 373 mAh g−1 at 1 A g−1 as well as excellent rate performance. This work provides a new avenue to solve the intrinsic problems for designing high-performance anode of SIBs.
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