Magnetron Sputtering Preparation of Nitrogen-Incorporated Lithium鈥揂luminum鈥揟itanium Phosphate Based Thin Film Electrolytes for All-Solid-State Lithium Ion Batteries
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- 作者：Guoqiang Tan ; Feng Wu ; Li Li ; Yadong Liu ; Renjie Chen
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：February 9, 2012
- 年：2012
- 卷：116
- 期：5
- 页码：3817-3826
- 全文大小：593K
- 年卷期：v.116,no.5(February 9, 2012)
- ISSN：1932-7455
文摘
We report for the first time a new lithium ion conducting Li鈥揂l鈥揟i鈥揚鈥揙鈥揘 thin film solid electrolyte for all-solid-state lithium ion batteries. It was prepared by radio frequency (RF) magnetron sputtering deposition using a NASICON structural Li鈥揂l鈥揟i鈥揚鈥揙 target in a N2 atmosphere at various temperatures. XRD and SEM test results showed that the thin film was composed of an amorphous structure and that its surface was smooth, dense, and homogeneous. FTIR and XPS analyses indicated that nitrogen atoms were actually incorporated into the Li鈥揂l鈥揟i鈥揚鈥揙 matrix framework. The substitution of nitrogen for oxygen in the thin film created more abundant cross-linking structures and decreased the electrostatic energy, which favored the higher mobility of lithium ions. A high Li ionic conductivity of 1.22 脳 10鈥? S/cm was obtained for the thin film deposited at room temperature. Moreover, the higher value of 1.22 脳 10鈥? S/cm for the thin film deposited at 500 掳C indicated that some crystallites in the amorphous film might be beneficial in improving Li ionic conductivity. Therefore, different conductivity values are correlated with structural differences. The temperature dependence of the ionic conductivities fit the Arrhenius relation and the thin film deposited at 500 掳C possessed of the lowest activation energy. Electrochemical analyses suggest that the high Li ionic conductivity is attributed to the reduced activation energy by the control of composition and structure. These properties make this thin film electrolyte a promising candidate material for use in all-solid-state thin film lithium ion batteries.