Issue 40, 2021

A high-performance cathode for potassium-ion batteries based on uniform P3-type K0.5Mn0.8Co0.1Ni0.1O2 porous microcuboids

Abstract

Layered transition-metal oxides have attracted intensive attention as advanced cathode materials of potassium-ion batteries (PIBs). Nevertheless, their practical application in PIBs is hindered by the unsatisfactory cycling stability and rate capability. Herein, we successfully prepared uniform P3-type K0.5Mn0.8Co0.1Ni0.1O2 porous microcuboids (c-KMCNO) through a low-cost ethanol mediated coprecipitation strategy. The unique porous microcuboid structure considerably reduces the K+ diffusion distance and relieves internal strain caused by continuous K+ intercalation/deintercalation, thus improving the reaction kinetics and architectural integrity to boost the cycling stability and rate performance of c-KMCNO. As a cathode material for PIBs, c-KMCNO delivers a high reversible capacity of 94.5 mA h g−1 at 20 mA g−1, excellent rate capability of 49.5 mA h g−1 at 500 mA g−1, and remarkable cycling stability with a well-retained morphology at 100 mA g−1 after 300 cycles. Furthermore, a K-ion full cell of c-KMCNO//soft carbon demonstrates a reversible capacity of 54.3 mA h g−1 at 100 mA g−1 with a decent capacity retention of 81.1% over 100 cycles. Therefore, this porous microcuboid material demonstrates potential applications as a high-performance low-cost cathode material for PIBs.

Graphical abstract: A high-performance cathode for potassium-ion batteries based on uniform P3-type K0.5Mn0.8Co0.1Ni0.1O2 porous microcuboids

Supplementary files

Article information

Article type
Communication
Submitted
19 Aug 2021
Accepted
19 Sep 2021
First published
20 Sep 2021

J. Mater. Chem. A, 2021,9, 22820-22826

A high-performance cathode for potassium-ion batteries based on uniform P3-type K0.5Mn0.8Co0.1Ni0.1O2 porous microcuboids

L. Duan, Y. Xu, Z. Zhang, J. Xu, J. Liao, J. Xu, Y. Sun, Y. He and X. Zhou, J. Mater. Chem. A, 2021, 9, 22820 DOI: 10.1039/D1TA07108D

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