Journal
NANO LETTERS
Volume 21, Issue 12, Pages 5225-5232Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c01276
Keywords
crystal phase engineering; transition metal oxide; cathode catalyst; charge overpotential; Li-O-2 battery
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Funding
- Beijing Natural Science Foundation [L182023]
- Beijing Institute of Technology Teli Young Fellow Program [3090011181903]
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By controlling the crystal phase of transition metal oxides, it is possible to reduce the charge overpotential, improving the efficiency and cycle life of Li-O-2 batteries. Optimization of the Mn/Co molar ratio = 8/2 has been shown to significantly reduce the charge overpotential, providing technical support for developing high-performance transition metal oxide catalysts.
Reducing charge-discharge overpotential of transition metal oxide catalysts can eventually enhance the cell efficiency and cycle life of Li-O-2 batteries. Here, we propose that crystal phase engineering of transition metal oxides could be an effective way to achieve the above purpose. We establish controllable crystal phase modulation of the binary MnxCo1-xO by adopting a cation regulation strategy. Systematic studies reveal an unprecedented relevancy between charge overpotential and crystal phase of MnxCo1-xO catalysts, whereas a dramatically reduced charge overpotential (0.48 V) via a rational optimization of Mn/Co molar ratio = 8/2 is achieved. Further computational studies indicate that the different morphologies of Li2O2 should be related to different electronic conductivity and binding of Li2O2 on crystal facets of MnxCo1-xO catalysts, finally leading to different charge overpotential. We anticipate that this specific crystal phase engineering would offer good technical support for developing high-performance transition metal oxide catalysts for advanced Li-O-2 batteries.
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