Boosting the Charge Storage Capability of Bi2TeO5 Cathode Using Iodide Ions in Aqueous Zinc-Based Batteries System

Liang Chen; Quan Cai; Yi Liu; Xuehui Xie

doi:10.1002/smll.202408132

Boosting the Charge Storage Capability of Bi₂TeO₅ Cathode Using Iodide Ions in Aqueous Zinc-Based Batteries System

Small. 2025 Jan;21(1):e2408132. doi: 10.1002/smll.202408132. Epub 2024 Oct 21.

Authors

Liang Chen¹, Quan Cai¹, Yi Liu¹, Xuehui Xie¹

Affiliation

¹ Hunan Collaborative Innovation Center of Environmental and Energy Photocatalysis, Hunan Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, Hunan, 410022, P. R. China.

PMID: 39434475
DOI: 10.1002/smll.202408132

Abstract

As insertion-type cathode materials of aqueous Zn-based batteries (ABs), bismuth chalcogenides/oxychalcogenides exhibits relatively limited capacities in ZnSO₄ baseline electrolyte. This work finds that Bi₂TeO₅ (BTO) cathode with pre-added I^- electrolyte additive can simultaneously achieve conversion and insertion chemistries, which enables aqueous BTO-Zn batteries to deliver an extraordinary electrochemical performance. As shown in the experiment results, the BTO cathode showcases an ultrahigh specific capacity of 534.9 mA h g^-1 at 0.5 A g^-1, excellent rate capability (237.3 mA h g^-1 at 10 A g^-1). In the estimation of cyclic durability, the capacity of the BTO cathode decreases from 271.2 to 171.1 mA h g^-1 during 2000 cycles at 10 A g^-1.

Keywords: Bi2TeO5; aqueous zinc‐based batteries; electrolyte additive; iodide ions.

Abstract

Grants and funding