Li_4Ti_5O_(12)的合成过程分析及性能

The performance of Li_4Ti_5O_(12) and analysis on the synthesis process

以高熔点的Li2CO3及低熔点的Li NO3为锂源,采用固相法合成Li4Ti5O12。热重、XRD及SEM实验表明:以Li2CO3为锂源时,合成过程为全固相;以Li NO3为锂源时,反应开始前有熔融Li NO3产生,产物具有更好的结晶性,形貌更接近球形,粒径略大但分布均匀。电化学性能测试表明:以Li NO3为锂源的产物,在0.5C、1.0C、2.0C、5.0C、8.0C及10.0C时的放电比容量分别为147 mAh/g、141 mAh/g、133 mAh/g、106 mAh/g、83 mAh/g和69 mAh/g,较以Li2CO3为锂源的产物分别提高了约5%、7%、12%、14%、16%和11%。

Li4Ti5O12 was prepared through solid state method with lithium source of Li2CO3 （high melting point） and LiNO3（low melting point）. The TG,XRD and SEM experiments showed that the synthesis process was an all-solid-state when Li2CO3 was used as lithium source, melted LiNO3 appeared before the reaction when LiNO3 was used as lithium source, the product had better crystaUinity, its morphology was closer to spherical, the particle size was ＇larger but more uniform. The electrochemical performance test showed that the 0.5 C, 1.0 C ,2.0 C, 5.0 C,8.0 C and 10.0 C specific discharge capacities of the product with LiNO3 as lithium source were 147 mAh/g, 141 mAh/g, 133 mAlv/g, 106 mAh/g,83 mAh/g and 69 mAh/g,respectively, which increased by 5% ,7%, 12%, 14%, 16% and 11% than those of the product with Li2CO3 as lithium source, respectively.