摘要
用不同的TiO2原料,在相同的实验条件下固相合成了锂二次电池正极材料Li4Ti5O12。电化学测试结果表明,由介孔TiO2原料合成的Li4Ti5O12正极材料表现出更好的电化学性能。在0.2 C倍率放电时,介孔TiO2原料合成的Li4Ti5O12可获得较高的比容量,达162.1 mAh/g,而且通过65个循环后,在2 C倍率放电时仍可保持高达102.9 mAh/g的比容量。还通过测试半电池的交流阻抗来进一步验证了由介孔TiO2原料合成的Li4Ti5O12具有较好的电化学性能。循环伏安测试结果表明,介孔TiO2原料合成的Li4Ti5O12有较好的充放电循环性能。
Cathode materials Li4Ti5O12 for secondary lithium batteries was prepared with different TiO2 by solid-state reaction method. The results of charge/discharge tests indicated that Li4Ti5O12 prepared with TiO2 mesoporous material showed better electrochemical capabilities than other Li4Ti5O12 materials synthesized with raw TiO2 or P25. A much higher specific capacity of 162.1 mAh/g could be obtained by Li4Ti5O12 prepared with TiO2 mesoporous material in the discharge progress at 0.2 C rate, and a capacity of 102.9 mAh/g could still be held after 65 cycles at 2 C rate. The electrochemical capacities of Li4TisO12 prepared with TiOa mesoporous material were also investigated by electrochemical impedance spectrums （EIS）. CV curves of Li4Ti5O12 prepared with TiO2 mesoporous material was given too in the paper.
出处
《电池工业》
CAS
2011年第6期337-341,共5页
Chinese Battery Industry
