Preparation and Electrochemical Performance of a S-Se-Ti3C2Tx/TiO2 Cathode

This paper proposes the preparation of a S-Se-Ti3C2Tx/TiO2 cathode by etching Ti3AlC2 with hydrofluoric acid and doping with selenium (Se). Through an electrochemical performance test, selenium is doped into the active material sulfur and forms a sulfur-selenium compound to compensate for the 'chemical inertness' of the elemental sulfur, thereby increasing the utilization rate of the active material. Taking advantage of the ability of TiO2 to absorb polysulfide compounds and the high conductivity of carbides, the Ti3C2Tx composite material, modified with TiO2 nanodots, is constructed in situ as a sulfur-selenium composite material carrier, achieving a high sulfur content of 80%. S-Se-Ti(3)C(2)Tx/TiO2 is used as the cathode, and the initial discharge specific capacity is as high as 1073 mAh g(-1), which improves the utilization of active materials and effectively inhibits the shuttle effect of lithium polysulfide intermediates.