Uniform P2-K0.6CoO2 Microcubes as a High-Energy Cathode Material for Potassium-Ion Batteries

Zhuangzhuang Zhang; Qiao Hu; Jiaying Liao; Yifan Xu; Liping Duan; Ruiqi Tian; Yichen Du; Jian Shen; Xiaosi Zhou

doi:10.1021/acs.nanolett.2c04649

Uniform P2-K_0.6CoO₂ Microcubes as a High-Energy Cathode Material for Potassium-Ion Batteries

Nano Lett. 2023 Jan 25;23(2):694-700. doi: 10.1021/acs.nanolett.2c04649. Epub 2023 Jan 11.

Authors

Zhuangzhuang Zhang^{1

2}, Qiao Hu³, Jiaying Liao¹, Yifan Xu¹, Liping Duan¹, Ruiqi Tian¹, Yichen Du¹, Jian Shen¹, Xiaosi Zhou¹

Affiliations

¹ School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China.
² School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China.
³ College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China.

PMID: 36629141
DOI: 10.1021/acs.nanolett.2c04649

Abstract

Layered transition-metal (TM) oxides have drawn ever-growing interest as positive electrode materials in potassium-ion batteries (PIBs). Nevertheless, the practical implementation of these positive electrode materials is seriously hampered by their inferior cyclic property and rate performance. Reported here is a self-templating strategy to prepare homogeneous P2-K_0.6CoO₂ (KCO) microcubes. Benefiting from the unusual microcube architecture, the interface between the electrolyte and the active material is considerably diminished. As a result, the KCO microcubes manifest boosted electrochemical properties for potassium storage including large reversible capacity (87.2 mAh g^-1 under 20 mA g^-1), superior rate performance, and ultralong cyclic steady (an improved capacity retention of 86.9% under 40 mA g^-1 after 1000 cycles). More importantly, the fabrication approach can be effectively extended to prepare other layered TM oxide (P3-K_0.5MnO₂, P3-K_0.5Mn_0.8Fe_0.2O₂, P2-K_0.6Co_0.67Mn_0.33O₂, and P2-K_0.6Co_0.66Mn_0.17Ni_0.17O₂) microcubes and nonlayered TM oxide (KFeO₂) microcubes.

Keywords: Layered transition-metal oxide; P2-K0.6CoO2; cathode; microcubes; potassium-ion battery.