Dual-stage K ion intercalation in VO-conductive polymer composites

We reported that the incorporation of a conductive polymer into V 2 O 5 materials resulted in an increased interlayer distance of 2.2 nm, favoring K + ion storage in aqueous electrolyte. In situ X-ray diffraction showed that during charging, K + ions were first inserted into the interlayer region of...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-07, Vol.9 (28), p.15629-15636
Main Authors: Charles, Daniel S, Guo, Fenghua, Shan, Xiaoqiang, Kim, SaeWon, Lebens-Higgins, Zachary W, Xu, Wenqian, Su, Dong, Piper, Louis F. J, Teng, Xiaowei
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Summary:We reported that the incorporation of a conductive polymer into V 2 O 5 materials resulted in an increased interlayer distance of 2.2 nm, favoring K + ion storage in aqueous electrolyte. In situ X-ray diffraction showed that during charging, K + ions were first inserted into the interlayer region of V 2 O 5 through pseudocapacitive intercalation and then continued to be inserted into the [VO 6 ] bi-layer region via diffusion-limited intercalation. This reversible dual-stage insertion/extraction mechanism provides new battery chemistry allowing the storage of around 50% more alkali ions in the intralayer region besides van der Waals gaps. Dual-stage K-ion insertion in vanadium oxide was reported. K-ions are first inserted into interlayers via pseudocapacitive intercalation and then inserted into the [VO 6 ] bi-layer (intralayer) via diffusion-limited intercalation.
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta02003j