复合材料Li_4Ti_5O_(12)/SnO_2的制备及电化学性能研究

Study on Preparation and Electrochemical Properties of Composite Material Li_4Ti_5O_(12)/SnO_2

采用化学沉积法制备Li4Ti5O12/SnO2复合材料,讨论了SnO2的含量对负极材料电化学性能的影响.通过X射线衍射（XRD）、扫描电镜（SEM）、恒流充放电测试对材料进行结构、形貌及电化学性能表征.结果表明：复合材料中的SnO2不会改变钛酸锂的尖晶石结构和形貌,当SnO2质量分数为5％时,材料的电化学性能最优;电压在1～3 V,进行恒流充放电测试,结果表明：0.1C倍率时,Li4Ti5O12的首次放电比容量为167.83 mAh/g,而5％复合材料的首次放电比容量为178.21 mAh/g.

Composite materials Li4TisO12/SnO2 was prepared by the method of chemical deposition, and the influence of electrochemical properties of the content of SnO2 on anode materials was discussed. Material structure ,morphology and electrochemical performance were characterization by X-ray diffraction （XRD）, Scanning electron microscope （SEM） , Constant current charge-discharge test. The result showed that： the spinal structure and morphology did not changed after SnO2 deposition on the surface of lithium titanate, The quality percentage of SnO2 was 5 % exhibiting excellent electrochemical performance ; The voltage range of test was between 1 -3 V, The galvanostatic discharge-charge testing indicated that the first discharge specific capacity of Li4Ti5 O12 was 167.83 mAh/g at 0.1 C ; However, the Composite material Li4Ti5 O12/SnO2 of 5 % was 178.21 mAh/g.