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- Title
Dual-phase nanostructuring of layered metal oxides for high-performance aqueous rechargeable potassium ion microbatteries.
- Authors
Li, Ying-Qi; Shi, Hang; Wang, Sheng-Bo; Zhou, Yi-Tong; Wen, Zi; Lang, Xing-You; Jiang, Qing
- 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. Aqueous rechargeable microbatteries could enable new microelectronics, but their current electrode materials still suffer from low capacity and poor rate capability. Here the authors show that layered KxV2O5·nH2O with an amorphous/crystalline dual-phase nanostructure can address these issues.
- Subjects
POTASSIUM ions; METALLIC oxides; VANADIUM; VANADIUM oxide; ENERGY density; POTASSIUM hydroxide; CATHODES
- Publication
Nature Communications, 2019, Vol 10, Issue 1, pN.PAG
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-019-12274-7