钠离子电池（SIBs）是一种可替代锂离子电池的绿色清洁能源。由于TiO₂具有化学稳定性好和廉价易得的优点，被作为一种优异的插入式负极材料广泛应用于钠离子电池。通过溶胶-凝胶法合成TiO₂@MWCNTs纳米复合材料，并利用X射线衍射、透射电子显微镜和扫描电子显微镜对复合材料的晶体结构和形貌进行表征。以TiO₂@MWCNTs纳米材料为负极组装钠离子电池，并对其电化学性能进行测试。在0.1 A/g电流密度下，该电池的初始放电容量可达477 mA·h/g，在循环1 000圈以后，放电容量仍然可以保持在181 mA·h/g，呈现出优异的长循环性能。

Sodium-ion battery is considered as promising alternative to lithium-ion battery.TiO₂ is deemed to be a very promising insertion-type anode material for sodium-ion battery because of its good chemical stability and low cost.TiO₂@MWCNTs nanocomposites are synthesized by sol-gel method.The crystal structure and morphology of TiO₂@MWCNTs nanocomposites are characterized by means of X-ray diffraction, transmission electron microscope and scanning electron microscope.Sodium-ion battery is assembled with TiO₂@MWCNTs as anode material, and its electrochemical properties are tested.The initial discharge capacity of the battery is 477 mAh·g^-1 at a current density of 0.1 A·g^-1.Its discharge capacity still remains at 181 mAh·g^-1 after 1 000 cycles, showing an excellent long-term cycle performance.

叶春林(2001-),男,本科生,研究方向为钠离子电池负极材料,1375842987@qq.com。