Dual-phase nanostructuring of layered metal oxides for high-performance aqueous rechargeable potassium ion microbatteries

Ying-Qi Li, Hang Shi, Sheng-Bo Wang, Yi-Tong Zhou, Zi Wen, Xing-You Lang () and Qing Jiang ()
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Ying-Qi Li: Jilin University
Hang Shi: Jilin University
Sheng-Bo Wang: Jilin University
Yi-Tong Zhou: Jilin University
Zi Wen: Jilin University
Xing-You Lang: Jilin University
Qing Jiang: Jilin University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Aqueous rechargeable microbatteries are promising on-chip micropower sources for a wide variety of miniaturized electronics. However, their development is plagued by state-of-the-art electrode materials due to low capacity and poor rate capability. Here we show that layered potassium vanadium oxides, KxV2O5·nH2O, have an amorphous/crystalline dual-phase nanostructure to show genuine potential as high-performance anode materials of aqueous rechargeable potassium-ion microbatteries. The dual-phase nanostructured KxV2O5·nH2O keeps large interlayer spacing while removing secondary-bound interlayer water to create sufficient channels and accommodation sites for hydrated potassium cations. This unique nanostructure facilitates accessibility/transport of guest hydrated potassium cations to significantly improve practical capacity and rate performance of the constituent KxV2O5·nH2O. The potassium-ion microbatteries with KxV2O5·nH2O anode and KxMnO2·nH2O cathode constructed on interdigital-patterned nanoporous metal current microcollectors exhibit ultrahigh energy density of 103 mWh cm−3 at electrical power comparable to carbon-based microsupercapacitors.

Date: 2019
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DOI: 10.1038/s41467-019-12274-7

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