Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 28, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202002223
Keywords
electrocatalysts; in situ X-ray absorption; Li-O-2 batteries; lithium cobalt oxides; self-boosting catalysis
Categories
Funding
- Beijing Natural Science Foundation [2182082]
- National Natural Science Foundation of China [11575192, 11975238]
- Scientific Instrument Developing Project of the Chinese Academy of Sciences [ZDKYYQ20170001]
- International Partnership Program of the Chinese Academy of Sciences [211211KYSB20170060, 211211KYSB20180020]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB28000000]
- University of the Chinese Academy of Sciences
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Designing high-activity catalysts and revealing the in-depth structure-property relationship is particularly important for Li-O-2 batteries. Herein, the self-boosting catalysis of LiCoO2 as an electrocatalyst for Li-O-2 batteries and the investigation of its self-adjustment mechanism using in situ X-ray absorption spectroscopy and other operando characterization techniques is reported. The intercalation/extraction of Li+ in LiCoO2 not only induces the change in Co valence and modulates the electronic/crystal structure but also tunes the surface disorder degree, lattice strain, and local symmetry, which all affect the catalysis activity. In a discharge, highly ordered LiCoO2 acts as a catalyst to boost oxygen reduction reaction. During charging, the initial extraction of Li+ from LiCoO2 induces Li/oxygen vacancy and Co4+, which deforms CoO6 octahedron as well as lowers the symmetry, and accordingly promotes oxygen evolution reaction. This article offers insights into tuning the activity of catalysts for Li-O-2 batteries with the intercalation/extraction of alkali metal ions in traditional cathodes.
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