Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (1): 157-166.doi: 10.19799/j.cnki.2095-4239.2023.0816

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Nuclear magnetic resonance spectroscopy for probing interfaces in electrochemical energy storage systems

Yimei OUYANG(), Mengmeng ZHAO, Guiming ZHONG(), Zhangquan PENG()   

  1. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2023-11-14 Revised:2023-12-02 Online:2024-01-05 Published:2024-01-22
  • Contact: Guiming ZHONG, Zhangquan PENG E-mail:ouyangyimei@dicp.ac.cn;gmzhong@dicp.ac.cn;zqpeng@dicp.ac.cn

Abstract:

A comprehensive understanding of the composition, structure, and correlated mass transfer and charge storage mechanisms at the interface of electrochemical energy storage systems (such as lithium-ion batteries and lithium metal batteries) is crucial for enhancing their cycling and rate performances over a wide temperature range. However, the inherent characteristics of these interfaces, such as thinness, disorderedness, and sensitivity, pose significant challenges for direct observation and precise characterization. Among the various available characterization techniques, nuclear magnetic resonance (NMR) spectroscopy stands out because of its unique ability to noninvasively and quantitatively identify interfacial components and achieve microstructural and microscopic dynamics. Moreover, in-situ electrochemical NMR spectroscopy has demonstrated great potential for investigating short-life intermediates and dynamic structural transformations at the interfaces of electrochemical energy-storage systems, offering crucial insights into the physicochemical properties and fundamental theories of these interfaces. This study presents a comprehensive review of NMR research methods for electrochemical energy storage interfaces. This study emphasizes the basic principles and application strategies of one-and two-dimensional NMR, isotope-tracer techniques, dynamic nuclear polarization, cross-polarization, and in-situ electrochemical NMR techniques. Examples are provided to enumerate the application of these methods in analyzing the compositional structures and interface ion transport of electrode-electrolyte and composite solid-state electrolyte interfaces as well as the charge storage mechanisms at the interface. These examples demonstrate the application potential and the research outcomes of NMR techniques for studying interfaces in electrochemical energy storage systems.

Key words: interfacial electrochemistry, in-situ electrochemical nuclear magnetic resonance, electrochemical energy storage, ionic transport

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