期刊
CHEMSUSCHEM
卷 12, 期 4, 页码 787-794出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201802682
关键词
electrochemistry; intercalations; lithium; scanning probe microscopy; surface analysis
资金
- Samsung Research Funding Centre of Samsung Electronics [SRFC-MA1602-05]
- National Research Foundation of Korea (NRF) [2014R1A4A1003712, 2017M2A2A6A01019608, 2018R1A2B2006133]
- National Research Foundation of Korea [2017M2A2A6A01019608] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The electrochemical (de)intercalation reactions of lithium ions are initiated at the electrode surface in contact with an electrolyte solution. Therefore, substantial structural degradation, which shortens the cycle life of cells, is frequently observed at the surface of cathode particles, including lithium-metal intermixing, phase transitions, and dissolution of lithium and transition metals into the electrolyte. Furthermore, in contrast to the strict restriction of moisture in lithium-ion cells with nonaqueous organic electrolytes, electrode materials in aqueous-electrolyte cells are under much more reactive environments with water and oxygen, thereby leading to serious surface chemical reactions on the cathode particles. The present article presents key results regarding structural and composition variations at the surface of oxide-based cathodes in both high-performance nonaqueous and recently proposed aqueous lithium-ion batteries; in particular, focusing on direct atomic-scale observations preformed by means of scanning transmission electron microscopy. Precise identification of surface degradation at the atomic level is thus emphasized because it can provide significant insights into overcoming the limitations of current lithium-ion batteries.
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