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journal article·2025-07-15Open access

Ca2+-Preintercalated V2O5 as a Dual-Function Cathode Additive for Polyiodide Anchoring in Zn–I2 Batteries

Xiaoyu Bi, Ao Yu, Jing Zhang, Jing Yu, Canhuang Li, Yuchuan Ren, Kaifu Lin, Jiali Chai, Qian Xue, Yanting Xie, Yapeng Cheng, Xingqi Chang, Xuan Lu, Linlin Yang, Ren He, Guifang Zeng, Chen Huang, Xuede Qi, Xueqiang Qi, Chaoqi Zhang, Jordi Arbiol, Timo Jacob, Andreu Cabot

ACS Nano· Volume 19· Issue 27
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Source abstract

Abstract

Aqueous zinc–iodine (Zn–I 2 ) batteries have attracted considerable attention due to their abundant resources, high safety, and environmental friendliness. However, challenges inherent to conversion-type electrodes, including severe active material shuttling and suboptimal Coulombic efficiency, continue to limit their performance. Here, we present a high-performance Zn–I 2 battery enabled by calcium-ion-preintercalated V 2 O 5 (CaVO) nanobelts as a cathode additive. By harnessing the synergistic effects of physical trapping (via activated carbon and interlayer confinement in CaVO) and chemical adsorption (through Ca 2+ binding sites), the hybrid host framework achieves superior immobilization of iodine species while simultaneously shortening Zn 2+ diffusion pathways, thereby facilitating efficient I 0 /I – redox kinetics. Furthermore, Ca-induced crystal structure modification enhances the Zn 2+ transport and provides additional capacity contributions. As a result, Zn–I 2 cells employing I 2 -loaded CaVO (CaVO/AC@I 2 ) composite cathodes deliver a high specific capacity of 244 mAh g –1 at 0.2 A g –1, outstanding rate performance with 78.5% capacity retention at 5 A g –1, and an impressive energy density of 279 Wh kg –1, based on the combined mass of I 2 and CaVO. This work presents a hybrid energy storage strategy for Zn–I 2 systems, providing a feasible approach for the development of next-generation high-performance aqueous batteries.
Source: openalex_inverted_index · Quality: baseline

Research context

Energy storageNanomaterialsComposites

OpenAlex topics: Advanced battery technologies research · Perovskite Materials and Applications · Advanced Battery Materials and Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Catalonia Institute for Energy Research - IREC Sant Adrià de Besòs

Departament d’Enginyeria Electrònica i Biomèdica

Universitat de Barcelona

Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany

Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST

Department of Chemistry

University of Barcelona

College of Materials Science and Engineering, Fuzhou University, No.2, Xueyuan Road, Minhou County, Fuzhou City, Fujian Province 350108, China

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering

Southwest Jiaotong University

Department of Chemical Engineering, Universitat Politècnica de Catalunya, EEBE, Eduard Maristany 10-14, 08019 Barcelona, Catalonia, Spain

College of Chemistry and Chemical Engineering

Chongqing University of Technology

ICREA, Pg. Lluis Company

Helmholtz-Institute-Ulm (HIU), Helmholtzstr. 11, 89081 Ulm, Germany

Karlsruhe Institute of Technology (KIT)

Funding

Bundesministerium für Bildung und Forschung · Fuzhou University · Ministerio de Ciencia, Innovación y Universidades · Deutsche Forschungsgemeinschaft · Baden-Württemberg Stiftung · NextGenerationEU · Generalitat de Catalunya · China Scholarship Council · Universitat Autònoma de Barcelona · Fujian Province Innovation Young Scientist Fund

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