Synthesis of CoSe2/Mxene composites using as high-performance anode materials for lithium-ion batteries

Currently, the energy densities of commercial lithium-ion batteries (LIBs) are getting closer and closer to their fundamental limit, and novel anode materials are urgent to be explored to meet the increasing requirements. CoSe2 has a high theoretical specific capacity of 494.4 mAh g(-1) and is expected to be a viable anode material for high-power LIBs. However, its actual specific capacity degrades rapidly during the cycling process, while the MXene Ti3C2Tx possesses excellent cycle stability but low specific capacity (about 110 mAh g(-1)). In this study, novel CoSe2/Ti3C2Tx composites with high specific capacity and good stability were successfully prepared by growing CoSe2 particles in situ on Ti3C2Tx via hydrothermal method. The results showed that after 1000 charge-discharge cycles at a current density of 0.3 A g(-1), CoSe2/Ti3C2Tx (with a molar ratio of 1:2) composite still has a high reversible capacity of 210.8 mAh g(-1). Excellent rate capability and electrochemical kinetic behavior are also achieved. This study indicates that CoSe2/Ti3C2Tx composites have a promising application prospect in LIBs as an anode material.

Automated summary

This study successfully prepared CoSe2/Ti3C2Tx composites with high specific capacity and good stability, exhibiting excellent rate capability and electrochemical kinetic behavior. The results suggest that CoSe2/Ti3C2Tx composites have a promising application prospect as an anode material in lithium-ion batteries.