Carbon Nanorod−MoS2 Core−Sheath Heterostructure and Its Electrochemical Properties over Various Electrochemical Windows
Manman Wu; Cong Liu; Hui Xu; Jiandong Shen; Yang Yang; Gang Yang
文献索引：10.1002/celc.201800096
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摘要
The powder of a carbon nanorod−MoS2 core−sheath heterostructure is successfully synthesized by using a hydrothermal method. The carbon nanorod−MoS2 material is composed of hierarchical MoS2 nanosheets tightly grown on carbon nanorods, in which the carbon nanorods as a template effectively reduce the aggregation of the MoS2 nanosheets. The electrochemical properties of the carbon nanorod−MoS2 composite electrode are studied in detail, as the intercalation of lithium into MoS2 includes two significant changes in lithiation mechanism, which occur over various electrochemical windows, such as from 1.0 to 3.0 V and from 0.001 to 3.0 V. The former mainly corresponds to the intercalation/extraction of lithium cations, and thus it presents excellent cyclic stability but low specific capacity. The later causes a big phase change in the final Li‐Sulfur battery system, and thus delivers a high specific capacity but is accompanied by serious pulverization and consequential fast capacity fading. MoS2 supported by carbon nanorods presents a better electrochemical performance than the pure MoS2 sample over various electrochemical windows.