Li4Ti5O12 modified with Ag nanoparticles as an advanced anode material in lithium-ion batteries
Li4Ti5O12 modified with Ag nanoparticles as an advanced anode material in lithium-ion batteries
复制标题
DOI：
10.1016/j.jpowsour.2013.07.048
复制
发表时间：
2014-01-01
影响因子：
9.2
通讯作者：
Czerwinski, Andrzej
中科院分区：
文献类型：
--
作者：
Krajewski, Michal;Michalska, Monika;Czerwinski, Andrzej
采用三步固相合成方法制备了尖晶石相Li4Ti5O12粉末，晶粒尺寸在几百纳米范围内。通过扫描和透射电子显微镜、x射线衍射、x射线光电子能谱和拉曼光谱验证，通过沉积2-10纳米银纳米粒子对表面进行修饰。采用时间电位法在三电极Swagelok电池中检测了这些Li4Ti5O12/n-Ag复合粉末的电化学性能。这些测量表明，制备的粉末具有优异的高速率性能和显著的良好循环性。具体来说，在将放电电流从1C提高到10C后，容量保持率超过86%，在1C电流下进行50次充放电循环后，容量损失小于6%。(C) 2013 Elsevier B.V.版权所有
A three-step solid state synthesis was used to produce powders of spinel phase Li4Ti5O12 with crystallite size in a few hundred nanometers range. This was followed by surface modification through the deposition of 2-10 nm Ag nanoparticles, as verified by scanning and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The electrochemical performance of these Li4Ti5O12/n-Ag composite powders was examined by chronopotentiometry in three-electrode Swagelok cells. These measurements showed excellent high-rate performance and remarkably good cyclability of the fabricated powders. Specifically, capacity retention in excess of 86% after raising the discharge current from 1C to 10C and less than 6% of capacity loss after 50 charge/discharge cycles at 1C current rate were measured. (C) 2013 Elsevier B.V. All rights reserved.