Institute of Metallurgy, Thermochemistry and Microkinetics Group, Clausthal University of Technology, Robert-Koch-Strasse 42, D-38678 Clausthal-Zellerfeld, Germany.
Nano Lett. 2013 Mar 13;13(3):1237-44. doi: 10.1021/nl304736t. Epub 2013 Feb 5.
Lithium migration in nanostructured electrode materials is important for an understanding and improvement of high energy density lithium batteries. An approach to measure lithium transport through nanometer thin layers of relevant electrochemical materials is presented using amorphous silicon as a model system. A multilayer consisting of a repetition of five [(6)LiNbO3(15 nm)/Si (10 nm)/(nat)LiNbO3 (15 nm)/Si (10 nm)] units is used for analysis, where LiNbO3 is a Li tracer reservoir. It is shown that the change of the relative (6)Li/(7)Li isotope fraction in the LiNbO3 layers by lithium diffusion through the nanosized silicon layers can be monitored nondestructively by neutron reflectometry. The results can be used to calculate transport parameters.
在理解和改进高能量密度锂电池时，了解锂离子在纳米结构电极材料中的迁移非常重要。本研究使用非晶硅作为模型系统，提出了一种测量相关电化学材料纳米薄层中锂离子传输的方法。使用由五个重复单元组成的多层结构进行分析，其中 LiNbO3 是锂离子的示踪剂储存库。结果表明，可以通过中子反射测量非破坏性地监测通过纳米硅层的锂离子扩散引起的 LiNbO3 层中相对 (6)Li/(7)Li 同位素分数的变化，并可以利用这些结果计算传输参数。
