Li2CuTi3O8–Li4Ti5O12 double spinel anode material with improved rate performance for Li-ion batteries
Li2CuTi3O8–Li4Ti5O12 double spinel anode material with improved rate performance for Li-ion batteries
复制标题
DOI：
10.1016/j.elecom.2008.10.029
复制
发表时间：
2009
影响因子：
5.4
通讯作者：
Da Wang;Huajun Xu;M. Gu;Chun-hua Chen
中科院分区：
文献类型：
--
作者：
Da Wang;Huajun Xu;M. Gu;Chun-hua Chen
采用固相反应法在800°C下合成了名义组成为Li4Ti5CuxO12+x（x= 0，0.075，0.15，0.3，0.6，1.20和1.67）的钛基负极材料。X射线衍射分析表明，烧结样品由尖晶石型Li4Ti5O12和Li2CuTi3O8以及少量的Li2O组成。采用扫描电镜、电阻测量和恒电流循环等方法对样品的结构和性能进行了表征。结果表明，组分Li2CuTi3O8的首次锂化导致了Cu的原位生成，从而显著提高了Li4Ti5CuxO12+x的倍率性能。最佳标称成分为Li4Ti5Cu0.15O12.15。
Ti-based anode materials with the nominal compositions Li4Ti5CuxO12+x(x=0, 0.075, 0.15, 0.3, 0.6, 1.20 and 1.67) were synthesized at 800°C by a solid-state reaction process. X-ray diffraction analysis indicated that the sintered samples were composed of intergrown spinel-type Li4Ti5O12and Li2CuTi3O8, and a small amount of Li2O. Scanning electron microscopy, electrical resistance measurement and galvanostatic cell cycling were also employed to characterize the structure and properties of the double spinel samples. It is proposed that the first lithiation of the component Li2CuTi3O8leads to the in situ production of Cu that can significantly improve the rate performance of Li4Ti5CuxO12+x. The optimal nominal composition is Li4Ti5Cu0.15O12.15.