Issue 24, 2024

Realizing a single-phase reaction and K+/vacancy disordering in P2-K0.56Na0.11Li0.12Ni0.22Mn0.66O2 by lithium substitution for potassium-ion batteries

Abstract

Rechargeable potassium-ion batteries (PIBs) have shown great potential as an alternative to lithium-ion batteries (LIBs) owing to the abundant and available potassium reserves. However, their applications are hindered by unsatisfactory cycling stability of cathode materials. Herein, through electrochemical ion-exchange of the Na0.85Li0.12Ni0.22Mn0.66O2 compound, we reported P2-K0.56Na0.11Li0.12Ni0.22Mn0.66O2 (P2-KNaLNM) as a potential high-performance cathode for PIBs. The presence of Li plays a key role in suppressing the K+/vacancy ordering within transition metal slabs. Therefore, P2-KNaLNM underwent a simple single-phase reaction during intercalation/extraction of K+ ions. Consequently, P2-KNaLNM delivers a reversible capacity of 90.2 mA h g−1 and good capacity retention of 89.6% over 150 cycles at 0.2C between 1.5 and 4.6 V (vs. K+/K). Furthermore, a satisfactory capacity retention of 91.5% after 300 cycles is achieved at 0.5C because of the excellent K+ kinetics during the charge and discharge process. This work provides a feasible way to develop a promising cathode candidate for PIBs.

Graphical abstract: Realizing a single-phase reaction and K+/vacancy disordering in P2-K0.56Na0.11Li0.12Ni0.22Mn0.66O2 by lithium substitution for potassium-ion batteries

Supplementary files

Article information

Article type
Communication
Submitted
30 3 2024
Accepted
29 5 2024
First published
30 5 2024

J. Mater. Chem. A, 2024,12, 14360-14366

Realizing a single-phase reaction and K+/vacancy disordering in P2-K0.56Na0.11Li0.12Ni0.22Mn0.66O2 by lithium substitution for potassium-ion batteries

Y. Tang, H. Dong, M. Liu, G. Wei, J. Li, W. Tang, Y. Liu, X. Zhu, Y. Feng, Q. Liu, D. Wang, Y. Xiao, P. Wang and B. Xiao, J. Mater. Chem. A, 2024, 12, 14360 DOI: 10.1039/D4TA02122C

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