期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 648, 期 -, 页码 820-833出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.06.050
关键词
Li -rich Mn-based cathode materials; Oxygen vacancies; Spinel phase; Initial Coulombic efficiency; Electrochemical performance
An innovative and scalable NH4Cl-assisted gas-solid interfacial reaction treatment technique is employed to construct oxygen vacancies and spinel/layered heterostructures simultaneously on the surface of LMOs, which effectively enhances the redox properties of the oxygen anion, inhibits irreversible oxygen release, mitigates side reactions at the electrode/electrolyte interface, and stabilizes the layered structure. The treated NC-10 sample shows significantly improved electrochemical performance with increased initial coulombic efficiency, excellent rate capability, and cycling stability.
Li-rich Mn-based oxide cathodes (LMOs) are regarded as one of the most prospective high energy density cathodes due to the reversible anion redox reaction, which gives them a very high capacity. However, LMOs materials usually have problems like low initial coulombic efficiency (ICE) and poor cycling performance during cycling, which are associated with irreversible surface O2 release and unfavourable electrode/electrolyte interface side reactions. Herein, an innovative and scalable NH4Cl-assisted gas-solid interfacial reaction treatment technique is employed to construct oxygen vacancies and spinel/layered heterostructures simultaneously on the surface of LMOs. The synergistic effect of the oxygen vacancy and the surface spinel phase can not only effectively enhance the redox properties of the oxygen anion and inhibit irreversible oxygen release, but also effectively mitigate the side reactions at the electrode/electrolyte interface, inhibit the formation of CEI films and stabilize the layered structure. The electrochemical performance of the treated NC-10 sample improved significantly, showing an increase in ICE from 77.4 % to 94.3 % and excellent rate capability and cycling stability, with
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