摘要
以钛酸丁酯、氢氧化锂为原料,在聚乙二醇(PEG200)体系下通过水热法合成了Li_4Ti_5O_(12)纳米片/TiO2纳米颗粒复合材料,采用XRD、SEM等对材料的结构,形貌等进行了表征。通过控制Li/Ti的摩尔比可以较好地控制TiO2的含量,分别得到纯的Li_4Ti_5O_(12)纳米片或Li_4Ti_5O_(12)纳米片/TiO2纳米颗粒复合材料。测试了制得材料的锂离子电池性能,结果表明,Li_4Ti_5O_(12)-TiO2复合纳米材料具有优良的充放电容量和倍率性能。首次放电可达到172 m Ah·g-1,充电可达到170 m Ah·g-1,效率高达98.8%。
Nanocomposites containing Li4Ti5O（12） nanosheets and TiO2 nanoparticles were synthesized by a low temperature hydrothermal method using butyl Titanate and Li OH·H2O as the precursors,and PEG200 as the structure directing agent. The as-synthesized products were characterized using X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）. By controlling the ratio of Li and Ti,pure sheet-like Li4Ti5O（12） and Li4Ti5O（12）/TiO2 composite nanomaterials could be prepared respectively. The Li ion battery performance of synthesized nanomaterials was measured.The results indicated that the obtained Li4Ti5O（12）-TiO2 nanocomposites had good Li ion battery performance. The initial discharge-charge capacities of Li4Ti5O（12）-TiO2 nanocomposites at 0. 2 C were 172 m Ah · g-1and 170 m Ah · g-1,respectively,in the window of 1. 0 - 2. 5 V at room temperture,the charge-discharge efficiency can reach 98. 8%.
出处
《广州化工》
CAS
2016年第11期111-113,116,共4页
GuangZhou Chemical Industry
