Volume 63, Issue 15 e202400621
Research Article

Highly Stable Photo-Assisted Zinc-Ion Batteries via Regulated Photo-Induced Proton Transfer

Wenwen Zha

Wenwen Zha

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China

Both authors contribute equally.

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Qiushi Ruan

Corresponding Author

Qiushi Ruan

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China

Both authors contribute equally.

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Long Ma

Long Ma

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China

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Meng Liu

Meng Liu

State Key Lab Mol React Dynamics, Dynamics Research Center Energy and Environmental Material, Dalian Institute Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023 P. R. China

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Huiwen Lin

Huiwen Lin

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China

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Litao Sun

Litao Sun

Key Lab of MEMS of Ministry of Education, SEU-FEI Nano-Pico Center, Southeast University, Nanjing, 210096 P. R. China

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ZhengMing Sun

Corresponding Author

ZhengMing Sun

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China

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Li Tao

Corresponding Author

Li Tao

Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing, 211189 P. R. China

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First published: 09 February 2024
Citations: 16

Graphical Abstract

Light can significantly improve the performance of batteries. However, zinc ion battery often exhibits poor cycling life under illumination, which limits its application and the mechanism is still ambiguous. This work demonstrates integrated photo-assisted zinc-ion batteries with high cyclic stability of 4000 cycles, extending the previous record by one order of magnitude through the discovery and optimization of a photo-induced proton transfer.

Abstract

Photo-assisted ion batteries utilize light to boost capacity but face cycling instability due to complex charge/ion transfer under illumination. This study identified photo-induced proton transfer (photo-induced PT) as a significant process in photo-(dis)charging of widely-used V2O5-based zinc-ion batteries, contributing to enhanced capacity under illumination but jeopardizing photo-stability. Photo-induced PT occurs at 100 ps after photo-excitation, inducing rapid proton extraction into V2O5 photoelectrode. This process creates a proton-deficient microenvironment on surface, leading to repetitive cathode dissolution and anode corrosion in each cycle. Enabling the intercalated protons from photo-induced PT to be reversibly employed in charge-discharge processes via the anode-alloying strategy achieves high photo-stability for the battery. Consequently, a ~54 % capacity enhancement was achieved in a V2O5-based zinc-ion battery under illumination, with ~90 % capacity retention after 4000 cycles. This extends the photo-stability record by 10 times. This study offers promising advancements in energy storage by addressing instability issues in photo-assisted ion batteries.

Conflict of interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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