Integrating Chemical Pre-Potassiation with Pre-Modulated KF-Rich Electrolyte Interfaces for Dual-Carbon Potassium Ion Hybrid Capacitor

Yong Qian; Bei Wu; Yang Li; Zhen Pan; Shuai Feng; Ning Lin; Yitai Qian

doi:10.1002/anie.202217514

Integrating Chemical Pre-Potassiation with Pre-Modulated KF-Rich Electrolyte Interfaces for Dual-Carbon Potassium Ion Hybrid Capacitor

Angew Chem Int Ed Engl. 2023 Feb 20;62(9):e202217514. doi: 10.1002/anie.202217514. Epub 2023 Jan 24.

Authors

Yong Qian¹, Bei Wu¹, Yang Li¹, Zhen Pan¹, Shuai Feng^{1

2}, Ning Lin¹, Yitai Qian¹

Affiliations

¹ Hefei National Laboratory for Physical Sciences at the Microscale, Department of Applied Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China.
² College of Chemistry and Chemical Engineering, Taishan University, Shandong, 271021, P. R. China.

PMID: 36622790
DOI: 10.1002/anie.202217514

Abstract

Herein, a chemical pre-potassiation strategy via simultaneously treating both glucose derived carbon (GDC) anode and commercial activated carbon (CAC) cathode in potassium-naphthalene-tetrahydrofuran solution is developed for potassium ion hybrid capacitor (PIHC). Combined with in situ and ex situ characterizations, a radical reaction between pre-potassiation reagent and carbon electrodes is confirmed, which not only deactivates electrochemical irreversible sites, but also promotes to pre-form a uniform and dense KF-rich electrolyte film on the electrodes. As a result, the pre-potassiation treatment presents multiple advantages: (I) the initial Coulombic efficiency (CE) of the GDC anode increases from 45.4 % to 84.0 % with higher rate capability; (II) the CAC cathode exhibits the improved cycling CEs and stability due to the enhanced resistance to electrolyte oxidation at 4.2 V; (III) the assembled PIHC achieves a high energy density of 172.5 Wh kg^-1 with cycling life over 10000 cycles.

Keywords: Chemical Pre-Potassiation Strategy; Higher Rate Capability; KF-Rich Electrolyte Interface; Radical Reaction; the Resistance to Electrolyte Oxidation.

Abstract

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