新型锡基材料的制备及其电化学储锂性能  

Preparation and electrochemical lithiation of tin-based materials

作　　者：林克芝[1] 王晓琳[1] 徐艳辉[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《电源技术》2005年第8期508-510,530,共4页Chinese Journal of Power Sources

摘　　要：采用水溶液化学沉淀法制备了两种锡基锂离子蓄电池负极材料,结晶态Sn6O4(OH)4和无定形态SnO2。将两种样品用于电化学储锂,结果表明,这两种锡基材料都表现出良好的嵌脱锂能力,其中Sn6O4(OH)4的电化学储锂性能优于SnO2,其可逆电化学容量较高,嵌脱锂的电位平台较低,循环第2周期的库仑效率超过90%,第3周期超过95%;而纳米级的无定形态SnO2在循环20周期后库仑效率高于Sn6O4(OH)4。实验还发现选择合适的充放电电压范围可获得更好的电化学性能。The two tin-based materials were prepared by chemical deposition in aqueous solution, crystallized Sn6O4（OH）4 and amorphous SnO2. The electrochemical lithiation of the two materials were investigated. Sn6O4 （OH）4 showed better performance of lithiation and de-lithiation than SnO2. The electrochemical reversible capacities of Sn6O4（OH）4 and SnO2 in the first cycle were 659 and 269 mAh ·g ^-1 respectively. The coulomb efficiencies of Sn6O4 （OH）4 were larger than 90 % in the first cycle and 95 % in the third cycle. The formation of Li2O in the first lithiation of Sn6O4（OH）4 and SnO2 can compensate the expansion of Sn as it alloyed with Li. The electrochemical cyclic performance when the Sn6O4（OH）4 sample was charge and discharge in the range of 0- 1 V were better than in the range of 0- 1.2 V.

关 键 词：锂离子蓄电池 化学沉淀法 锡基材料 电化学储锂 循环性能 

分 类 号：TM912.9[电气工程—电力电子与电力传动]