期刊
ENERGY STORAGE MATERIALS
卷 35, 期 -, 页码 400-430出版社
ELSEVIER
DOI: 10.1016/j.ensm.2020.11.002
关键词
Sodium-ion batteries; Layered oxide cathodes; Characterization techniques; In-situ; Theoretical computations
资金
- National Natural Science Foundation of China [21805007, 22075016, 21825102]
- Young Elite Scientists Sponsorship Program by CAST [2018QNRC001]
- Beijing Natural Science Foundation [L182019]
- Fundamental Research Funds for the Central Universities [FRF-TP-20-020A3]
- 111 Project [B12015, B170003]
This article summarizes the latest advances in the study of layered transition metal oxides as cathodes for sodium-ion batteries, focusing on the application of advanced analytical techniques to reveal structural evolution and electrochemical responses. Understanding the material's structure, composition changes, etc., can provide guidance for the design of new electrode materials.
Layered transition-metal oxides have been extensively pursued as promising cathodes for sodium-ion batteries (SIBs) by virtue of their two-dimensional Na-diffusion channels and high theoretical capacities. Nevertheless, irreversible phase transitions, structural instability, and moisture sensitivity place obstacles in their way to approach higher performance. Aiming at tackling these challenging issues, an in-depth understanding of the structural evolutions, morphology changes, composition and valence variations, as well as the electrode/electrolyte interface reactions upon battery cycling is of vital importance. Current state-of-the-art characterization techniques can gain valuable insights into the elusive reaction mechanisms, yield an overall picture of the battery configurations, and provide a guideline for the design of new electrode materials. Herein, the latest progresses on the applications of advanced analytical techniques to probe the Na-storage layered oxide cathodes are comprehensively summarized. In-situ or operando techniques are highlighted in this review to directly link the real-time structure, morphology, composition information with the electrochemical response, and the electrochemical measurements are also mentioned in selected examples. Special attention is paid to the detection principle of each technique and what valuable information can be obtained. Finally, the future developments of layered oxides towards highperformance SIB cathode materials with the help of advanced diagnostic methods are well prospected.
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