低温水热法制备花状球形钛酸锂的性能

采用低温水热法合成花状球形结构钛酸锂(Li_4Ti_5O_(12)),对微-纳结构的形成机理及产物的电化学性能进行研究。双氧水(H_2O_2)是控制微-纳分层结构形成的关键因素。当一水合氢氧化锂、钛酸异丙酯用量分别为1.269 g、1.99 g,双氧水加入量为3 ml时,产物的电化学性能较好:在1.0~2.5 V充放电,5.0 C循环的首次放电比容量为164.8 m Ah/g,循环至500次时,容量保持率为80.2%;在0.1 C、0.5 C、1.0 C、5.0 C、10.0 C、15.0 C和20.0 C倍率下依次循环5次,20.0 C放电比容量仍高达128.3 mAh/g。

Performance of flower-like spherical lithium titanate synthesized by low temperature hydrothermal method

A flower-like spherical lithium titanate (Li4Ti5O12) was synthesized by low temperature hydrothermal method,the formation mechanism of the micro-nano hierarchical structure as well as its electrochemical performance were studied.Hydrogen peroxide(H2O2) was the key factor to control the formation of micro-nano hierarchical structure.When the amount of hydrated lithium hydroxide and isopropyl titanate was 1.269 g and 1.99 g,respectively,H2O2 adding volume was 3 ml,product showed better electrochemical performance:when charged-discharged in 1.0-2.5 V,the initial discharge specific capacity of 5.0 C cycle was 164.8 mAh/g,the capacity retention rate was 80.2％ at the 500th cycle.The 20.0 C specific discharge capacity was still as high as 128.3 mAh/g,when it was performed 5 cycles at 0.1 C,0.5 C,1.0 C,5.0 C,10.0 C,15.0 C and 20.0 C,respectively.