多孔网状结构TiO2柔性电极的可控制备研究

Study on Controllable Preparation of Porous Network TiO2 Flexible Electrode

通过水热法调整NaOH浓度、水热反应时间以及反应温度,制备了TiO2柔性电极材料。水热合成的优化条件是NaOH溶液浓度为0.5 mol/L,反应温度为200℃,反应时间为16 h。该条件下制备出的TiO2具有多孔网状结构,这种结构可以增强电解液浸润,缩短Li+扩散路径,加快锂离子和电子的传输。恒流充电性能测试结果显示,多孔网状结构的TiO2材料具有较好的循环稳定性,在800 mA/g电流密度下,循环50圈之后,可逆容量为112 mA·h/g,容量保持率为67.8%。同时具有优异的倍率性能,在较高电流密度1 600 mA/g下,可逆容量仍可保持在103.4 mA·h/g。

TiO2 flexible electrode materials were prepared by hydrothermal adjustment of NaOH concentration,hydrothermal reaction time and reaction temperature.The optimal conditions of hydrothermal synthesis are NaOH solution concentration of 0.5 mol/L,reaction temperature of 200 ℃,and reaction time of 16 h.TiO2 prepared under the conditions has a porous network structure,which can enhance the electrolyte infiltration,shorten the Li+ diffusion path,and accelerate the transport of lithium ions and electrons.Constant current charging performance test results show that TiO2 with porous network structure has good cycle stability.The reversible capacity is 112 mA·h/g and the capacity retention rate is 67.8% after 50 cycles at the current density of 800 mA/g.The TiO2 also has an excellent rate performance.When the current density is as high as 1 600 mA/g,the reversible capacity can still be maintained at 103.4 mA·h/g.