材料科学
纳米片
电化学
阳极
电导率
化学工程
兴奋剂
退火(玻璃)
碳纤维
储能
纳米技术
电极
复合材料
光电子学
复合数
化学
物理
工程类
量子力学
物理化学
功率(物理)
作者
Ningning Li,Li Sun,Kai Wang,Jun Zhang,Xianghong Liu
标识
DOI:10.1016/j.electacta.2020.136983
摘要
Transition metal dichalcogenides (TMDs) such as MoSe2 have received extensive attention as anodes for Potassium-ion batteries (KIBs) due to their high energy density and unique layered structure. However, the low conductivity and structural collapse during the insertion and extraction of K+ can lead to fast capacity decay and poor rate performance. Herein, a sheet-on-tube structure of MoSe2 [email protected] carbon nanotubes (MoSe2@NCT) is rationally designed and prepared by hydrothermal and subsequent annealing process. The NCT can increase the electrical conductivity and stabilize the MoSe2 nanosheets during repeated charging and discharging processes, thus improving the electrochemical performance of MoSe2@NCT. In addition, the high level N-doping in NCT can create paramount defects serving as the active sites to facilitate K+ storage. Electrochemical tests reveal that the MoSe2@NCT demonstrates a high reversible capacity (247 mA h g − 1 after 100 cycles at 0.1 A g − 1), cycling stability and superior rate performance. A series of physic-chemical tests indicate the very good electrochemical performances are resulting from the nanosheet structure of MoSe2, high conductivity of carbon and functional N-doping. The proposed strategy in structure engineering and the excellent electrochemical properties delivered in this work may provide a new idea to develop high performance anodes in KIBs.
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