材料科学
硫化
二硫化钨
硫黄
二硫化钼
空位缺陷
储能
纳米技术
化学工程
碳纤维
涂层
电解质
电化学
扩散
钨
电极
结晶学
化学
复合材料
冶金
物理化学
热力学
功率(物理)
工程类
物理
复合数
作者
Xing Zhang,Ruyi Bi,Jiangyan Wang,Meng Zheng,Jin Wang,Ranbo Yu,Dan Wang
标识
DOI:10.1002/adma.202209354
摘要
Hollow multishelled structure (HoMS) is a promising multi-functional platform for energy storage, owing to its unique temporal-spatial ordering property and buffering function. Accurate co-control of its multiscale structures may bring fascinating properties and new opportunities, which is highly desired yet rarely achieved due to the challenging synthesis. Herein, a sequential sulfidation and etching approach is developed to achieve the delicate co-control over both molecular- and nano-/micro-scale structure of WS2-x HoMS. Typically, sextuple-shelled WS2-x HoMS with abundant sulfur vacancies and expanded-interlayer spacing is obtained from triple-shelled WO3 HoMS. By further coating with nitrogen-doped carbon, WS2-x HoMS maintains a reversible capacity of 241.7 mAh g-1 at 5 A g-1 after 1000 cycles for sodium storage, which is superior to the previously reported results. Mechanism analyses reveal that HoMS provides good electrode-electrolyte contact and plentiful sodium storage sites as well as an effective buffer of the stress/strain during cycling; sulfur vacancy and expanded interlayer of WS2-x enhance ion diffusion kinetics; carbon coating improves the electron conductivity and benefits the structural stability. This finding offers prospects for realizing practical fast-charging, high-energy, and long-cycling sodium storage.
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