摘要
以钛酸丁酯和LiOH·H_2O为原料,以十六烷基三甲基溴化铵为表面活性剂,利用水热法合成球形尖晶石结构钛酸锂,探讨制备工艺对球形钛酸锂结构的影响,并对合成球形钛酸锂的电化学性能进行表征。结果表明:n(LiOH·H_2O)∶n(钛酸丁酯)=0.9∶1,170℃水热反应36h,并在600℃热处理2h条件下合成的Li_4Ti_5O_(12)具有较好的球形度和结晶度,其在0.1C放电倍率下的首次可逆容量为201 mAh·g^(-1),循环20次后可逆容量仍达198mAh·g^(-1);当放电倍率达50C时,其首次可逆容量仍达149mAh·g^(-1),经20次循环后容量保持率高达98.9%,表现出良好的循环性能和倍率特性。
Spherical spinel Li4Ti5O12 was prepared by hydrothermal method, using tetrabutyl titanate and LiOH · H2 O as raw material and hexadecyl trimethyl ammonium bromide as surfactant. The effect of preparation conditions on the structure of Li4 Ti5 O12 was investigated and the electrochemical performance of El4 Ti5 O12 was also studied. The results indicated that Li4 Ti5 O12 had good sphericity and crystallinity under the conditions that n （LiOH · H2O） ： n（tetrabutyl titanate） was 0. 9 ： 1, hydrothermal temperature was 170℃, hydrothermal time was 36 h and temperature of heat treatment was 600 ℃. In the first charge-discharge cycle, its reversible capacity at a rate of 0. 1C was 201 mAh · g^-1, and which can still reach 198 mAh · g^-1after 20 cycles. The initial reversible capacity reached 149 mAh · g^-1 at 50C and the retention rate of capacity was 98. 9% after 20 cycles, which indicated good cycling and rate performance.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2015年第22期20-24,共5页
Materials Reports
基金
国家自然科学基金(21203258)
中央高校基本科研业务费项目(CQDXWL-2014-Z008)
关键词
锂离子电
池钛酸锂
制备工艺
电化学性能
Li-ion batteries, Li4 Ti5 O12, preparation technology, electrochemical performance
