Crystal Phase-Controlled Modulation of Binary Transition Metal Oxides for Highly Reversible Li-O<sub>2</sub> Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 34060314.
- Also identified by DOI 10.1021/acs.nanolett.1c01276.
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Abstract
Reducing charge-discharge overpotential of transition metal oxide catalysts can eventually enhance the cell efficiency and cycle life of Li-O<sub>2</sub> 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 Mn<sub><i>x</i></sub>Co<sub>1-<i>x</i></sub>O by adopting a cation regulation strategy. Systematic studies reveal an unprecedented relevancy between charge overpotential and crystal phase of Mn<sub><i>x</i></sub>Co<sub>1-<i>x</i></sub>O 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 Li<sub>2</sub>O<sub>2</sub> should be related to different electronic conductivity and binding of Li<sub>2</sub>O<sub>2</sub> on crystal facets of Mn<sub><i>x</i></sub>Co<sub>1-<i>x</i></sub>O 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<sub>2</sub> batteries.