机械力辅助固相法合成钛酸锂

Preparation of Li4Ti5O12 by Mechanical Force-assisted Solid-state Method

以二氧化钛为钛源,碳酸锂为锂源,应用机械力辅助固相法一步合成钛酸锂(Li4Ti5O12)材料。使用TGA-DSC、XRD、SEM、粒度分析等手段,对产物的物相、形貌、粒度、电化学性能进行表征,将Li4Ti5O12样品制成2032纽扣电池,通过充放电测试仪研究了首次库伦效率及充放电循环性能。结果表明:在机械力辅助下750℃反应3.5h可制得纯相Li4Ti5O12,粒径分布均匀,主要集中在0.6~2.5μm,首次循环放电比容量为152.02mAh/g,经过20次充放电循环,容量保持率为96.5%。

Lithium titanate(Li4Ti5O12) samples were synthesized via mechanical force-assisted solid phase route using titanium dioxide and lithium carbonate as the initial titanium source and lithium source,respectively.The phase structure,morphology,particle size and electrochemical properties of the prepared Li4Ti5O12 were investigated respectively by TGA-DSC,XRD,SEM,granulometer and lithium battery tester.2032 button batteries were prepared using the Li4Ti5O12 samples,and the cycle performance and rate performance were studied.The results show that pure Li4Ti5O12 can be synthesized via mechanical force-assisted solid phase route at 750 ℃ for 3.5 h,with the uniform particle size of 0.6~2.5 μm,the initial discharge specific capacity of 152.02 mAh/g and 96.5% of the capacity retention rate after 20 times of charge-discharge cycle.