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3D hierarchical microspheres constructed by ultrathin mos2-c nanosheets as high-performance anode material for sodium-ion batteries

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Journal of Energy chemistry 2020年第10期29卷 307-315页

作者： Wenlong Zhang Haihui Zhou Zhongyuan Huang Songlin Li chuqing Wang Huanxin Li Zhanheng Yan Teng Hou Yafei Kuang State Key Laboratory for chemo/Biosensing and chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina

mos2/c composites are considered to have great application potential in sodium-ion batteries(SIBs).It is a challenging and meaningful subject that developing high-performance anode materials via combining mos2 and carbon effectively to give free rein to their advantages in sodium ion storage.In this work,a novel mos2-c material was designed by using cellulose nanocrystals(cNcs)as low-cost and green carbon source.3 D hierarchical microspheres(200-250 nm)constructed by ultrathin mos2-c nanosheets were synthesized by synchronizing the pre-carbonization of cNcs with the formation of mos2 in hydrothermal reaction and subsequent pyrolysis process.It is found that the ultrathin mos2-c nanosheets were composed of cNcs-derived short-range ordered carbon and few-layered mos2.Benefiting from the unique structure and robust combination of mos2 and cNcs-derived carbon,the ultrathin mos2-c nanosheets composite was proved to have excellent cycling stability and superior rate performance in sodium-ion half-cell test and have high first reversible specific capacity of 397.9 m Ah/g in full-cell test.This work provides a significant and effective pathway to prepare mos2-c materials with excellent electrochemical performance for the application in large-scale energy storage systems.

关键词： cellulose nanocrystals mos2-c nanosheets Hierarchical microspheres Anode material Sodium-ion batteries

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