Abstract: The further development of lithium-ion battery performance is restricted by the limited theoretical specific capacity of commercial graphite， thus highlighting the urgent need to develop lithium-ion battery anode materials with high specific capacity. Transition metal molybdenum oxide （MoO₃） has attracted considerable attention owing to its advantages of high theoretical specific capacity and low cost. However， MoO₃ has problems such as poor electronic conductivity， volume expansion and structural collapse during repeated charge-discharge cycles， which limits its further application. In this paper， the precursor of MoO₃ was in-situ grown on Ti₃C₂X MXenes nanosheets by thermal synthesis strategy to construct MoO₃@MXenes composites for electrochemical lithium storage. The results show that Ti₃C₂X MXenes as a substrate improves the electronic conductivity of MoO₃， inhibits the volume expansion of MoO₃ during charge-discharge cycles， and enhances the pseudocapacitive characteristics， rate performance and cycle stability of MoO₃. The contribution rate of MoO₃@MXenes composites is 85.6% at a scan rate of 1.2 mV·s^-1. After 800 charge-discharge cycles at a current density of 1.0 A·g^-1， MoO₃@MXenes composites still have a high specific capacity of 565 mA·h·g^-1. When the current density is increased by 40 times， the capacity retention rate is 47.5%. The MoO?@MXene composite developed in the study is mainly based on pseudocapacitive eneray storage， with low charge-transfer resistance， excellent rate performance and cycling stability. This synthesis strategy of the composite material offers a new method for molybdenum oxide electrode materials.

Key words: molybdenum oxide; thermal synthesis strategy; Ti₃C₂X MXene; in situ growth; pseudocapacitive characteristic; lithium storage performance