Molecular Regulation on Carbonyl-Based Organic Cathodes: Toward High-Rate and Long-Lifespan Potassium-Organic Batteries

Dongxue Wang; Xiaoxiao You; Mingliang Wu; Huaxi Huang; Li Chen; Di Wu; Jianlong Xia

doi:10.1021/acsami.1c01745

Molecular Regulation on Carbonyl-Based Organic Cathodes: Toward High-Rate and Long-Lifespan Potassium-Organic Batteries

ACS Appl Mater Interfaces. 2021 Apr 14;13(14):16396-16406. doi: 10.1021/acsami.1c01745. Epub 2021 Apr 1.

Authors

Dongxue Wang^{1

2}, Xiaoxiao You^{1

2}, Mingliang Wu^{1

2}, Huaxi Huang^{1

2}, Li Chen^{1

2}, Di Wu^{1

2}, Jianlong Xia^{1

2}

Affiliations

¹ School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei 430070, People's Republic of China.
² State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Center of Smart Materials and Devices, Wuhan University of Technology, 122 Luoshi Road, Wuhan, Hubei 430070, People's Republic of China.

PMID: 33793194
DOI: 10.1021/acsami.1c01745

Abstract

Organic redox-active molecules have been identified as promising cathodes for practical usage of potassium-ion batteries (PIBs) but still struggle with serious dissolution problems and sluggish kinetic properties. Herein, we propose a pseudocapacitance-dominated novel insoluble carbonyl-based cathode, [2,6-di[1-(perylene-3,4,9,10-tetracarboxydiimide)]anthraquinone, AQ-diPTCDI], which possesses high reversible capacities of 150 mAh g^-1, excellent cycle stability with capacity retention of 88% over 2000 cycles, and fast kinetic properties. The strong intermolecular interactions of AQ-diPTCDI and in situ formed cathode electrolyte interphase films support it against the dissolution problem. The high capacitive-like contribution in capacities and fast potassium-ion diffusion enhance its reaction kinetics. Moreover, a symmetric organic potassium-ion battery (OPIB) based on AQ-diPTCDI electrodes also exhibits outstanding K-storage capability. These results suggest that AQ-diPTCDI is a promising organic cathode for OPIBs and provide a practicable route to realize high-performance K storage.

Keywords: capacitive-controlled charge storage; insoluble carbonyl-based cathodes; organic potassium-ion batteries; stable CEI layers; symmetric full cells.