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Journal Article

A High-Energy Tellurium Redox-Amphoteric Conversion Cathode Chemistry for Aqueous Zinc Batteries

MPS-Authors
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Li,  Xiaodong       
Department of Synthetic Materials and Functional Devices (SMFD), Max Planck Institute of Microstructure Physics, Max Planck Society;

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Feng,  Xinliang       
Department of Synthetic Materials and Functional Devices (SMFD), Max Planck Institute of Microstructure Physics, Max Planck Society;

External Resource

https://doi.org/10.1002/adma.202313621
(Publisher version)

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Advanced Materials-2024-Du.pdf
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Citation

Du, J., Zhao, Y., Chu, X., Wang, G., Neumann, C., Xu, H., et al. (2024). A High-Energy Tellurium Redox-Amphoteric Conversion Cathode Chemistry for Aqueous Zinc Batteries. Advanced Materials, 36(19): 2313621. doi:10.1002/adma.202313621.


Cite as: https://hdl.handle.net/21.11116/0000-000E-78E5-9
Abstract
Rechargeable aqueous zinc batteries are potential candidates for sustainable energy storage systems at a grid scale, owing to their high safety and low cost. However, the existing cathode chemistries exhibit restricted energy density, which hinders their extensive applications. Here, a tellurium redox-amphoteric conversion cathode chemistry is presented for aqueous zinc batteries, which delivers a specific capacity of 1223.9 mAh gTe−1 and a high energy density of 1028.0 Wh kgTe−1. A highly concentrated electrolyte (30 mol kg−1 ZnCl2) is revealed crucial for initiating the Te redox-amphoteric conversion as it suppresses the H2O reactivity and inhibits undesirable hydrolysis of the Te4+ product. By carrying out multiple operando/ex situ characterizations, the reversible six-electron Te2−/Te0/Te4+ conversion with TeCl4 is identified as the fully charged product and ZnTe as the fully discharged product. This finding not only enriches the conversion-type battery chemistries but also establishes a critical step in exploring redox-amphoteric materials for aqueous zinc batteries and beyond.