Research Article


Layered K0.54Mn0.78Mg0.22O2 as a high-performance cathode material for potassium-ion batteries

Ruling Huang1, Qing Xue2, Jiao Lin1, XiXue Zhang1, Jiahui Zhou1, Feng Wu1,3,4,5, Li Li1,3,4,5 (✉), and Renjie Chen1,4,5

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1 Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
2 State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute Co. Ltd., Beijing 102209, China
3 Guangdong Key Laboratory of Battery Safety, Guangzhou Institute of Energy Testing, Guangzhou, Guangdong 511447, China
4 Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, China
5 Institute of Advanced Technology, Beijing Institute of Technology, Jinan 250300, China

Keywords: potassium-ion batteries, layered metal oxide cathode, Jahn−Teller effect, Mg doping, structural deterioration
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Layered Mn-based oxides are one of the promising cathode materials for potassium-ion batteries (KIBs) owing to their high theoretical capacities, abundant material supply, and simple synthesis method. However, the structural deterioration resulting from the Jahn-Teller effect of Mn ions hinders their further development in KIBs. Herein, a novel Mn-based layered oxide, K0.54Mn0.78Mg0.22O2, is successfully designed and fabricated as KIBs cathode for the first time. It delivers smooth charging/discharging curves with high specific capacity of 132.4 mAh·g‒1 at 20 mA·g‒1 and good high-rate cycling stability with a capacity retention of 84% over 100 cycles at 200 mA·g‒1. Combining in-situ X-ray diffraction (XRD) and ex-situ X-ray photoelectron spectroscopy (XPS) analysis, the storage of K-ions by K0.54Mn0.78Mg0.22O2 is revealed to be a solid-solution processes with reversible slip of the crystal lattice. The studies suggest that the rational doping of inactive Mg2+ can effectively suppress the Jahn-Teller effect and provide outstanding structure stability. This work deepens the understanding of the structural evolution of Mn-based layered materials doped with inactive materials during de/potassiation processes.
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Layered K0.54Mn0.78Mg0.22O2 as a high-performance cathode material for potassium-ion batteries. Nano Res.

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