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

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.