WU Liming, ZHAO Hang, LI Qian, LIU Yan gai, MU Nan, MI Ruiyu

(Beijing Key Laboratory of Non-metallic Materials and Solid Waste Resource Materials Utilization, School of Materials Science and Engineering, China University of Geosciences (Beijing), Beijing 100083, China)

Abstract: Ti₃C₂ MXene matrix was prepared by selective etching with MAX Ti₃AlC₂ as precursor. NaTiO₂ nanosheets were grown on surface of the Ti₃C₂ MXene nanosheets by co-heating Ti₃C₂ with Na₂Si₉H₂O. The layered Ti₃C₂ MXene/NaTiO₂ composite inherited the structural advantages of Ti₃C₂ and the componential superiorities of NaTiO₂, which is conducive to ion transmission and diffusion. The Ti₃C₂ MXene/NaTiO₂ composites show excellent electrochemical properties, with a discharge specific capacity of 253.60 mAhg^-1 after 250 cycles at a current density of 200 mA.g^-1, which is retained at 144.70 mAh.g^-1 at the current density of 2000 mA.g^-1.

Key words: sodium ion battery; Ti₃C₂ MXene/NaTiO₂; layered structure; electrochemical performance