Li_4Ti_5O_(12)/C复合材料的合成及性能研究

Synthesis and performance of Li_4Ti_5O_(12)/C composite materials

以醋酸锂(LiAc)和二氧化钛(TiO2)为主要原料,H2C2O4为还原剂,柠檬酸为配位剂及碳源,采用流变相反应法合成了Li4Ti5O12/C复合材料。采用X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)对合成材料的晶体结构和微观形貌进行表征,采用恒流充放电系统及交流阻抗测试法对合成材料的电化学性能进行了测试,结果表明:该方法合成的Li4Ti5O12/C复合材料在粒径、高倍率充放电性能及循环稳定性等方面都优于相同方法合成的纯相锂钛尖晶石(Li4Ti5O12)。

Li4Ti5O12/C composite materials were synthesized by rheological phase method, using lithium acetate and titanium dioxide as raw materials, oxalic acid as areductant, citric acid as coordination agent and carbon source. The crystal structure and microstructure were characterized by XRD and SEM. And the electrochemical properties of the samples were investigated by constant-current charge-discharge system and AC impedance spectroscopy testing method. The results show that the performance of Li4Ti5O12/C composite materials synthesized by this method was better in particle size, high-rate charge/discharge ability and cycling stability than those of pure Li4Ti5O12 synthesized by same method.