Selenium enriched over-oxidized Mo3Se4 decorated MXene as a high-performance Li-ion battery anode material

The anode materials in Li-ion battery (LIB) are key components that define the performance of the cell. We have developed new selenium enriched and over-oxidized Mo₃Se₄ decorated MXene (Mo₃Se₄@Ti₃C₂T_x) composite as a promising anode material for Li-ion battery (LIB). By using selective experimental conditions, Mo₃Se₄@ Ti₃C₂T_x was successfully developed with unique structural and morphological features. When being employed as anode material in LIB, Mo₃Se₄@Ti₃C₂T_x delivered high stable reversible specific discharge capacity of 1250 mAh/g at 0.1C, which is significantly higher than traditional carbon-based anode materials. In addition, the composite retained 84.53 % of initial specific capacity when the C-rate was increased from 0.1C to 1.5C, implying excellent rate performance. The Mo₃Se₄@Ti₃C₂T_x composite also demonstrated remarkable cycling stability with negligible loss after 378 cycles. This exceptional electrochemical performance can be assigned to the exclusive architecture of Mo₃Se₄@Ti₃C₂T_x composite, leading to increase in exposure of active Li⁺ sites and structural stability.