不同钛源制备钛酸锂负极材料及其性能研究

Preparation and properties of lithium titanate anode materials with different titanium sources

通过高温固相法制备球形Li_(4)Ti_(5)O_(12)负极材料,探究了采用不同钛源所制备的Li_(4)Ti_(5)O_(12)的性能差异。通过XRD、SEM对制备的材料进行结构及形貌的表征,同时将合成的材料进行电化学测试。结果表明,分别以纳米TiO_(2)(P40)、工业H_(2)TiO_(3)、含铁工业H_(2)TiO_(3)为钛源制备的Li_(4)Ti_(5)O_(12)材料t-LTO、h-LTO、f-LTO在较低倍率0.2 C下的放电比容量分别为170.0、156.3、150.7 mAh/g,在较高倍率5 C下的放电比容量分别为91.9、93.0、26.7 mAh/g。在1 C下充放电循环100次后容量保持率分别为97.4%、97.3%、94.6%。以纳米TiO_(2)及工业H2TiO3为钛源制备得到的Li_(4)Ti_(5)O_(12)具有较好的电化学性能,因此可用较为纯净的工业H_(2)TiO_(3)为钛源代替价格高昂的TiO_(2)制备Li_(4)Ti_(5)O_(12)负极材料。

Spherical Li_(4)Ti_(5)O_(12)anode materials were prepared by high temperature solid phase method,and the effects of different titanium sources on the properties of Li_(4)Ti_(5)O_(12)anode materials were investigated.The structure and morphology of the prepared materials were characterized by XRD and SEM,and the synthesized materials were tested by electrochemical method.The results show that the discharge specific capacities of t-LTO,h-LTO and f-LTO prepared with nano TiO2(P40),industrial H2TiO3 and industrial H_(2)TiO_(3)containing iron are 170.0,156.3 and 150.7 mAh/g at lower charge/discharge rate of 0.2 C,respectively.And the discharge specific capacities at the higher rate of 5 C are 91.9,93.0 and 26.7 mAh/g,respectively.After 100 cycles of charging and discharging at 1 C,the capacity retention rates are 97.4%,97.3%and 94.6%,respectively.Li_(4)Ti_(5)O_(12)prepared with nano TiO_(2)and industrial H_(2)TiO_(3)has good electrochemical performance,so relatively pure industrial H_(2)TiO_(3)can be used as a sub-stitute for expensive TiO_(2)to prepare Li4Ti5O12 anode materials.