In situ fabrication of flaky-like NiMn-layered double hydroxides as efficient catalyst for Li-O2 battery
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Layered double hydroxide (LDH)-based catalysts have emerged as one of the most promising catalysts due to their unique layered structure, compositional flexibility, low cost, and easy synthesis. Herein, NiMn-LDH was in situ incorporated with carbon black (CB) via a facile hydrothermal method, and the morphology of the LDHs tended to be small-sized flaky-like from large bulk flower-like with the increasing amount of CB. The fabricated 50CB/NiMn-LDH cathode tended to induce the poorly crystalline film–like Li2O2 to form, indicating the significant effect of NiMn-LDH flake on the surface redox reaction. The lithium-oxygen (Li-O2) battery with 50CB/NiMn-LDH cathode exhibited improved capacity output (5684 vs 2682 mAh g−1), low overpotential (1.49 vs 1.62 V), and stable cyclability (35th vs 15th). The present synthetic strategy is very simple and low cost and can be easily extended to other LDH-based materials with significant effect.
KeywordsLi-O2 battery Electrochemical performance Catalyst Layered double hydroxides
This study is supported by the National Natural Science Foundation of China (No. 51608412), the Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JQ2034), the Scientific Research Fund of Shaanxi University of Science and Technology (No. 2016BJ-48), the Special Fund Project of Education Department in Shaanxi Province of China (No. 17JK0086), and the Science and Technology Department Foundation of Shaanxi Province (No. 2016GY-199).
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