多硫化物
阳极
纳米团簇
材料科学
多收费
硫黄
化学工程
电解质
吸附
次磷酸钠
溶解
电池(电)
纳米颗粒
无机化学
异质结
过渡金属
镍
软硬酸碱理论
锂硫电池
储能
阴极
纳米技术
钠
吸热过程
电极
电化学
锂(药物)
有机自由基电池
钠离子电池
金属
作者
Bohan Zhang,Yiwei Yao,Meng Qin,Chi Chen,Jun Yan,Jieshan Qiu
出处
期刊:Small
[Wiley]
日期:2025-10-07
卷期号:21 (48): e07142-e07142
标识
DOI:10.1002/smll.202507142
摘要
Nickel disulfides have been actively investigated as sodium-ion battery anode materials because of their relatively high capacity and relatively low cost. However, their practical application is severely hindered by overcharge failure in ether-based electrolytes induced by the dissolution of sodium polysulfides. Herein, sulfur vacancy-rich NiS2/Cu2S heterojunction nanoclusters anchored on Ti3C2Tx MXene nanosheets (NCMX) are synthesized through a facile solvothermal method. Density functional theory calculation combined with ex situ characterizations illustrates that sulfur vacancies significantly enhance the adsorption of sodium polysulfides, while the heterointerface-induced built-in electric field facilitates rapid Na⁺ adsorption and accordingly accelerates their efficient conversion to Na2S. The synergistic effects endow the NCMX anode with exceptional sodium-ion storage performances. It delivers remarkable reversible capacity (668 mAh g-1 at 0.1 A g-1), superb rate capability (482 mAh g-1 at 5 A g-1), and impressive cycling stability (543 mAh g-1 after 1000 cycles at 1 A g-1 with a negligible capacity decay of 0.0034% per cycle). Such a strategy of simultaneous construction of heterojunction and sulfur vacancies paves a new avenue to tackle the polysulfide shuttling to design advanced high-performance transition metal disulfide anodes for sodium-ion storage.
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