Phase-engineered cathode for super-stable potassium storage

Lichen Wu, Hongwei Fu, Shu Li, Jian Zhu (), Jiang Zhou, Apparao M. Rao, Limei Cha (), Kunkun Guo, Shuangchun Wen and Bingan Lu ()
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Lichen Wu: Hunan University
Hongwei Fu: Hunan University
Shu Li: Hunan University
Jian Zhu: Hunan University
Jiang Zhou: Central South University
Apparao M. Rao: Clemson University
Limei Cha: Guangdong Technion–Israel Institute of Technology
Kunkun Guo: Hunan University
Shuangchun Wen: Hunan University
Bingan Lu: Hunan University

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract The crystal phase structure of cathode material plays an important role in the cell performance. During cycling, the cathode material experiences immense stress due to phase transformation, resulting in capacity degradation. Here, we show phase-engineered VO2 as an improved potassium-ion battery cathode; specifically, the amorphous VO2 exhibits superior K storage ability, while the crystalline M phase VO2 cannot even store K+ ions stably. In contrast to other crystal phases, amorphous VO2 exhibits alleviated volume variation and improved electrochemical performance, leading to a maximum capacity of 111 mAh g−1 delivered at 20 mA g−1 and over 8 months of operation with good coulombic efficiency at 100 mA g−1. The capacity retention reaches 80% after 8500 cycles at 500 mA g−1. This work illustrates the effectiveness and superiority of phase engineering and provides meaningful insights into material optimization for rechargeable batteries.

Date: 2023
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DOI: 10.1038/s41467-023-36385-4

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