以竹纤维为模板制备微米管状Li4Ti5O12负极材料

摘要

以竹纤维为模板,Ti(OC4H9)4和Li(Ac).2H2O为原料,用模板法制备锂离子电池微米管状Li4Ti5O12负极材料.采用XRD,SEM,BET,充放电实验和交流阻抗等对合成材料的结构、形貌和电化学性能进行表征.研究结果表明:制备的微米管状Li4Ti5O12负极材料由尖晶石型纳米Li4Ti5O12颗粒构成,具有较大的比表面积,该材料具有良好的电化学性能,在0.5～3.0V,0.1C倍率下的首次放电比容量为178mA.h/g,充放电循环100次后放电比容量仍保留162mA.h/g,且倍率性能优异.%Microtube Li4Ti5O12 anode materials for lithium-ion batteries were synthesized using bamboo fiber as template, and Ti(OC4H9)4 and Li(Ac)·2H2O as raw materials. The structure, morphology and electrochemical properties of Li4Ti5O12 were characterized by X-ray diffraction (XRD), scanning electronic morphology (SEM), Brunauer-Emmett-Teller method (BET), galvanostatic charge-discharge tests and electrochemical impedance spectroscopy (EIS) measurements. The results show that the Li4Ti5O12 microtubes are composed of spinel Li4Ti5O12 nano-particles, which has a high special surface area resulting in improved electrochemistry performances. The electrochemical test results show that the spinel Li4Ti5O12 microtube delivers the initial discharge capacity of 178 mAh/g at 0.1 C current rate in the voltage rang of 0.5-3.0 V, and its discharge capacity retains 162 mAh/g after 100 cycles. The spinel Li4Ti5O12 material has an excellent rate performance.