Methods of investigating structural evolution and interface behavior in cathode materials for Li-ion batteries

doi:10.19799/j.cnki.2095-4239.2020.0212

Abstract

Abstract:

The increasing demand for energy storage requires energy storage devices to have greater capacity, and there are high hopes for lithium-ion batteries (LIBs) in the energy storage field. Their structural stability as cathode materials and their voltage profiles for insertion/extraction directly determine the specific energy and power densities of the battery system. In recent years, research related to these characteristics has remained the core issue in the LIB research field, particularly the characterization of the material structure and electrochemical behavior. Important real-time and in-situ strategies were employed in designing and developing more types of materials with excellent performance. For the cathode materials, detailed insights, such as their microstructure, chemical composition, ion valence and states, character of morphology, ion transport, and electron transfer, are beneficial in the preparation, structure design and modification of electrode materials. In this review, the operating principles, usage scenarios, and corresponding information of characterization techniques are introduced, and some examples that use these techniques to characterize LIB anode materials are listed. Finally, the advantages and disadvantages of current characterization techniques are compared, and the major challenges in research studies are discussed. Hence, this article summarizes the typically used technologies that are applied in monitoring the structural changes and surface-interface behaviors of cathode materials, including the microscopic imaging, phase analysis, composition and chemical valence, and bonding and functional groups to provide a reference for the combined utilization of various characterization technologies and to promote the development of an ideal electrode material.

Key words: lithium-ion battery, cathode materials, in-situ characterization, surface-interface behavior, electrochemistry

CLC Number:

O 646

Yue MU, Yun DU, Hai MING, Songtong ZHANG, Jingyi QIU. Methods of investigating structural evolution and interface behavior in cathode materials for Li-ion batteries[J]. Energy Storage Science and Technology, 2021, 10(1): 7-26.

Figures/Tables 11

References 86

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