Dual-stage K+ ion intercalation in V2O5-conductive polymer composites. Issue 28 (17th June 2021)

• Record Type: Journal Article
• Authors: Charles, Daniel S.; Guo, Fenghua; Shan, Xiaoqiang; Kim, SaeWon; Lebens-Higgins, Zachary W.; Xu, Wenqian; Su, Dong; Piper, Louis F. J.; Teng, Xiaowei
• Is Part Of: Journal of materials chemistry. Volume 9:Issue 28(2021)
• Page Start: 15629
• Page End: 15636
• Publication Date: 2021-06-17
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta02003j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : 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 [VO6 ] bi-layer (intralayer) via diffusion-limited intercalation. Abstract : We reported that the incorporation of a conductive polymer into V2 O5 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 V2 O5 through pseudocapacitive intercalation and then continued to be inserted into the [VO6 ] 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.