Research & Development Group, Hitachi, Ltd. , Hitachi-shi, Ibaraki 319-1292, Japan.
J Am Chem Soc. 2018 Feb 7;140(5):1608-1611. doi: 10.1021/jacs.7b13357. Epub 2018 Jan 26.
A fundamental understanding of concentrations of salts in lithium-ion battery electrolytes during battery operation is important for optimal operation and design of lithium-ion batteries. However, there are few techniques that can be used to quantitatively characterize salt concentration distributions in the electrolytes during battery operation. In this paper, we demonstrate that in operando X-ray phase imaging can quantitatively visualize the salt concentration distributions that arise in electrolytes during battery operation. From quantitative evaluation of the concentration distributions at steady states, we obtained the salt diffusivities in electrolytes with different initial salt concentrations. Because of no restriction on samples and high temporal and spatial resolutions, X-ray phase imaging will be a versatile technique for evaluating electrolytes, both aqueous and nonaqueous, of many electrochemical systems.
在电池运行过程中，对锂离子电池电解液中盐浓度的基本理解对于锂离子电池的最佳运行和设计非常重要。然而，定量描述电池运行过程中电解液中盐浓度分布的技术很少。在本文中，我们证明了实时 X 射线相衬成像可以定量可视化电池运行过程中电解液中出现的盐浓度分布。通过对稳态下浓度分布的定量评估，我们得到了不同初始盐浓度电解液中的盐扩散系数。由于对样品没有限制，且具有高时间和空间分辨率，X 射线相衬成像将成为评估许多电化学系统的水溶液和非水溶液电解质的通用技术。
