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; Bingan Lu

doi:10.1038/s41467-023-36385-4

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, Bingan Lu^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

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.

Original language	English
Article number	644
Journal	Nature Communications
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41467-023-36385-4
State	Published - Dec 2023

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title = "Phase-engineered cathode for super-stable potassium storage",

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.",

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AU - Wu, Lichen

AU - Fu, Hongwei

AU - Li, Shu

AU - Zhu, Jian

AU - Zhou, Jiang

AU - Rao, Apparao M.

AU - Cha, Limei

AU - Guo, Kunkun

AU - Wen, Shuangchun

AU - Lu, Bingan

PY - 2023/12

Y1 - 2023/12

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AB - 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.

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Phase-engineered cathode for super-stable potassium storage

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