Intercalation pseudocapacitance mechanism realizes high-performance cathode for aqueous potassium ion batteries

Guowei Zeng; Usman Ali; Maoyu Sun; Yu Zhang; Lihua Fu; Yiqian Li; Yuehan Hao; Bingqiu Liu; Chungang Wang

doi:10.1016/j.jcis.2023.09.061

Intercalation pseudocapacitance mechanism realizes high-performance cathode for aqueous potassium ion batteries

J Colloid Interface Sci. 2024 Jan;653(Pt A):46-55. doi: 10.1016/j.jcis.2023.09.061. Epub 2023 Sep 9.

Authors

Guowei Zeng¹, Usman Ali¹, Maoyu Sun¹, Yu Zhang¹, Lihua Fu¹, Yiqian Li¹, Yuehan Hao¹, Bingqiu Liu², Chungang Wang³

Affiliations

¹ Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin 130024, PR China.
² Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin 130024, PR China. Electronic address: liubq142@nenu.edu.cn.
³ Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, Jilin 130024, PR China. Electronic address: wangcg925@nenu.edu.cn.

PMID: 37708731
DOI: 10.1016/j.jcis.2023.09.061

Abstract

Aqueous potassium-ion batteries have garnered significant interest due to their eco-friendly characteristics and affordability. However, The suboptimal lifetime and restricted energy density of electrode materials present considerable obstacles to the advancement of aqueous potassium ion batteries. In this paper, we report a Ce doped MnO₂ material (Ce-MnO₂). Ce-MnO₂ with large lattice spacing and abundant oxygen defects successfully triggered the intercalation pseudocapacitance behavior in aqueous potassium ion batteries. The intercalation pseudocapacitance mechanism gives MnO₂ good capacity and enhanced stability. The Ce-MnO₂ demonstrates a high discharge capacity of 120 mAh g^-1 at 1 A g^-1 with a low concentration electrolyte. It also has a capacity retention rate of 82.5% at 2000 cycles at 5 A g^-1. The application of the intercalation pseudocapacitance mechanism offers a new approach to addressing the challenges associated with aqueous potassium-ion batteries.

Keywords: Aqueous potassium ion batteries; Ce-MnO(2); Intercalation pseudocapacitance.