Article

A Multidimensional Topotactic Host Composite Anode Toward Transparent Flexible Potassium-Ion Microcapacitors

Ruijun BaiSchool of Material Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, ChinaMiaoxin ZhangSchool of Material Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, ChinaXin ZhangSchool of Material Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, ChinaShijing ZhaoCenter for High Pressure Science and Technology Advanced Research, Beijing 100094, ChinaWeifeng ChenCanadian Light Source, Saskatoon, Saskatchewan S7N2V3, CanadaNing ChenCanadian Light Source, Saskatoon, Saskatchewan S7N2V3, CanadaPuguang JiSchool of Material Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, ChinaMirtemir KurbanovArifov Institute of Ion-Plasma and Laser Technologies, Academy of Sciences of the Republic of Uzbekistan, Tashkent 100077, UzbekistanHua WangSchool of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 100191, ChinaHuiyang GouCenter for High Pressure Science and Technology Advanced Research, Beijing 100094, ChinaGongkai WangSchool of Material Science and Engineering, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, China

ACS Applied Materials & Interfacesjournal2021en

ABI

Abstract

Transparent flexible supercapacitors (TFSCs) are a tantalizing power supplier for future transparent flexible electronics. However, their energy density is far behind a practical level while maintaining high transparency. We report here a transparent flexible potassium-ion microcapacitor, and its high energy density (15.5 μWh cm–2) roots in the battery-supercapacitor hybrid storage mechanism and much enlarged working voltage (3 V), outperforming the state-of-the-art TFSC, which is generally based on an aqueous electrolyte and an asymmetric pseudocapacitive mechanism. From an electrode material perspective, a multidimensional topotactic host composite anode is designed in which the component not only performs energy storage by synchronous and reversible uptake of potassium ions and electrons into its host structure, but also mutually compensates individual weakness in functional and structural aspects, efficiently constructing a three-dimensional potassium-ion diffusion and electron transport system. This conceptual exhibition provides design principles at material and device levels for high-performance TFSCs.

Topics

Supercapacitor Materials and Fabrication MXene and MAX Phase Materials Advancements in Battery Materials

Identifiers

DOI: 10.1021/acsami.1c20609

Citations and references

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