在离子电池电解质中在极化过程中量化质量传输,通过in situ 7Li NMR成像
Matilda Klett1, Marianne Giesecke, Andreas Nyman
1Division of Applied Electrochemistry, Department of Chemical Engineering and Technology, KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden.
Journal of the American Chemical Society
|August 21, 2012
概括
现场核磁共振成像直接测量离子电池电解质度梯度在运行过程中. 这允许准确地确定盐的扩散性和Li ((+) 运输数,这对于高功率应用至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 核磁共振光谱学 核磁共振光谱学
背景情况:
- 离子电池电解质中的质量传输不佳限制了高功率应用.
- 在操作条件下了解运输特性对于电池性能至关重要.
研究的目的:
- 在现场证明 (7) Li NMR成像用于捕获电池电解质中的度梯度.
- 使用电化学运输模型来确定盐的扩散性和Li(+) 运输数.
主要方法:
- 使用in situ (7) Li NMR成像来观察当前应用期间的电解质度变化.
- 采用电化学运输模型,从观察到的梯度中推导出运输特性.
主要成果:
- 在实时中成功捕获动态离子度梯度.
- 直接从NMR成像数据中量化盐的扩散性和Li(+) 运输数.
结论:
- 在现场 (7) Li NMR成像是一种强大的,多功能工具,用于评估电池电解质.
- 这种方法为优化电池性能提供了对运输现象的重要见解.
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