摘要
采用溶胶-凝胶法结合高温烧结合成了一种混合储能材料Li4Ti5O12/AC。通过溶胶-凝胶的实验条件优化,并在惰性气氛保护下800℃、16h烧结得到产物,经扫描电子显微镜法(SEM)、X射线衍射光谱法(XRD)分析得知,产物为纯相尖晶石结构,Li4Ti5O12晶体为纳米级微晶。随着Li4Ti5O12含量的降低,复合材料的大倍率充放电性能有明显提高,3C充放电时,放电比容量可达到160mAh/g,其充放电机制包含两个过程,其一为活性炭的双电层充放电过程,另一个为LTO的锂离子嵌入/放出过程。
A composite material of Li4Ti5O2 （LTO） loaded activated carbon （AC） has been synthesized via a sol-gel process. The samples were attained by calcined the precursor at 800 ℃ for 16 h in Ar/N2 atmosphere. Such nano-sized LTO with pure spinel crystal was confirmed by XRD and SEM observation. The electrochemical performance of the composite material was obviously improved with the decreasing of LTO loading ratio at high-rate charge--discharge. In the case of 30% LTO loaded AC, the discharge capacity of LTO reached 160 mAh/g at the current rate of 3 C. The charge-discharge mechanism has been thought containing two processes, one is from electric double layer of AC, and the other is attribute to lithium ion insertion and extraction of LTO.
出处
《电源技术》
CAS
CSCD
北大核心
2009年第8期662-665,共4页
Chinese Journal of Power Sources
基金
天津市重点基金(07JCZDJC02300)
