Flower-like K1+δVOPO4F crystallite with a layered framework structure as a robust cathode for potassium-ion batteries

He，Haiyan1; Cao，Kuo1; Guo，Shu2,3; Yao，Wenjiao4; Chen，Fei1; dong，Jiemin1; Chen，Chun Hua1

2023-04-30

10.1016/j.jpowsour.2023.232862

JOURNAL OF POWER SOURCES   Impact Factor & Quartile

0378-7753

Potassium-ion batteries (KIBs) have attracted more and more attention due to the abundant potassium resources and hence low cost of raw materials. Nevertheless, the performances of KIBs are still unsatisfactory for practical applications, mainly due to the lack of suitable cathode materials. In this work, we report for the first time a novel polyanionic compound KVOPOF as a potassium ion storage host. Thanks to its flexible while stable layered [VOPOF] framework, as a KIB cathode material, it can provide a reversible capacity of about 101 mAh g at a rate of 0.2 C with a 87% capacity retention after 250 cycles. The corresponding energy density of 363 Wh kg is among the highest for K-ion storage. The working mechanism of the V/V redox reaction is determined by in-situ X-ray diffraction (XRD) and ex situ X-ray photoelectron spectra (XPS) analyses. Notably, it delivers a stable average capacity of 75 mAh g for 700 cycles at 1 C with a capacity retention rate of 76%. This work presents that KVOPOF is a promising K storage cathode material with merits of high energy density and long cyclability.

High energy density Layered framework Long cyclability Polyanionic compound Potassium-ion batteries cathode

English

Others

MATERIALS SCIENCE

2-s2.0-85148772046

Scopus

1.CAS Key Laboratory of Materials for Energy Conversions,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei,230026,China
2.Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.International Quantum Academy,Shenzhen,518048,China
4.Advanced Energy Storage Technology Research Center,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China

He，Haiyan,Cao，Kuo,Guo，Shu,et al. Flower-like K1+δVOPO4F crystallite with a layered framework structure as a robust cathode for potassium-ion batteries[J]. JOURNAL OF POWER SOURCES,2023,564.

He，Haiyan.,Cao，Kuo.,Guo，Shu.,Yao，Wenjiao.,Chen，Fei.,...&Chen，Chun Hua.(2023).Flower-like K1+δVOPO4F crystallite with a layered framework structure as a robust cathode for potassium-ion batteries.JOURNAL OF POWER SOURCES,564.

He，Haiyan,et al."Flower-like K1+δVOPO4F crystallite with a layered framework structure as a robust cathode for potassium-ion batteries".JOURNAL OF POWER SOURCES 564(2023).