摘要
Molybdenum disulfide(MoS_(2)) is a promising electrode material for sodium-ion batteries as it offers a large capacity through a distinct conversion reaction.However,the electrochemical potential of MoS_(2) is often restrained by the poor conductivity as the dominant 2 H phase is a semiconductor while the metallic1 T phase is thermodynamically unstable.In this work,we report a hybrid design and material preparation of freestanding nanosheets of MoS_(2) composed of both 1 T and 2 H phases based on mild hydrothermal reaction.The introduction of the metallic 1 T-MoS_(2) phase into 2 H-MoS_(2) and their intimate hybridization enable a significant improvement in electronic conductivity,while the freestanding architecture avoids possible electrochemical aggregation.When used as electrodes for sodium storage,such a hybrid MoS_(2) affords a high capacity of~500 mA h g^(-1) at 0.5 A g^(-1) after 300 cycles,and retains capacity of~200 mA h g^(-1) at a high current rate of 4 A g^(-1),thus demonstrating their potential in high-performance battery applications.
基金
supported by the National Natural Science Foundation of China(Nos.51872192,51672182,51772197)
the Thousand Young Talents Plan,the Jiangsu Natural Science Foundation(No.BK20180002)
the Key University Science Research Project of Jiangsu Province(Nos.19KJA170001,17KJA430013)。
