Layered K0.37MnO2·0.25H2O as cathode material for potassium ion batteries

Chang Liu; Feiyang Chao; Zhen Huang; Zhuo Qu; Gangyuan Liu; Yao Xiao; Wenwei Zhang; Han Tang; Shijie Dong; Ping Luo

doi:10.1088/1361-6528/accfa2

Layered K_0.37MnO₂·0.25H₂O as cathode material for potassium ion batteries

Nanotechnology. 2023 May 12;34(30). doi: 10.1088/1361-6528/accfa2.

Authors

Chang Liu¹, Feiyang Chao¹, Zhen Huang¹, Zhuo Qu¹, Gangyuan Liu¹, Yao Xiao¹, Wenwei Zhang², Han Tang¹, Shijie Dong^{1

3

4}, Ping Luo^{1

3}

Affiliations

¹ Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, New Materials and Green Manufacturing Talent Introduction and Innovation Demonstration Base, Hubei Provincial Key Laboratory of Green Materials for Light Industry, School of Materials and Chemical Engineering, Hubei University of Technology, 430068, Wuhan, People's Republic of China.
² State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, 430070, Hubei, People's Republic of China.
³ Hubei Longzhong Laboratory, Hubei University of Technology, 441000, Xiangyang, Hubei, People's Republic of China.
⁴ Wuhan Polytechnic University, 430023, Wuhan, People's Republic of China.

PMID: 37094562
DOI: 10.1088/1361-6528/accfa2

Abstract

Lithium supply shortages have prompted the search for alternatives to widespread grid system applications. Potassium-ion batteries (PIBs) have emerged to promising candidates for this purpose. Nonetheless, the large radius of K⁺(1.38 Å) impedes the march of satisfactory cathode materials. Here, we used solid-phase synthesis to prepare a layered K_0.37MnO₂·0.25H₂O (KMO) cathode, comprising alternately connected MnO₆octahedra with a large interlayer spacing (0.71 nm) to accommodate the migration and transport of K⁺ions. The cathode material achieved initial specific capacities of 102.3 and 88.1 mA h g^-1at current densities of 60 mA g^-1and 1 A g^-1, respectively. The storage mechanism of K⁺ions in PIBs was demonstratedex situusing x-ray diffraction, x-ray photoelectron spectroscopy, and Raman spectroscopy measurements. Overall, our proposed KMO was confirmed as an auspicious cathode material for potential use in PIBs.

Keywords: cathode; layered structure; manganese dioxide; potassium ion batteries.