Volume 62, Issue 21 e202302302
Research Article

Regulating the Inner Helmholtz Plane with a High Donor Additive for Efficient Anode Reversibility in Aqueous Zn-Ion Batteries

Jinrong Luo

Jinrong Luo

College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 P. R. China

These authors contributed equally to this work.

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Liang Xu

Liang Xu

Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 P. R. China

These authors contributed equally to this work.

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Yijing Zhou

Yijing Zhou

College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 P. R. China

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Tianran Yan

Tianran Yan

Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 P. R. China

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Yanyan Shao

Yanyan Shao

College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 P. R. China

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Dongzi Yang

Dongzi Yang

College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 P. R. China

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Liang Zhang

Liang Zhang

College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 P. R. China

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Zhou Xia

Zhou Xia

College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, 215006 P. R. China

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Tianheng Wang

Tianheng Wang

School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 P. R. China

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Prof. Liang Zhang

Prof. Liang Zhang

Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 P. R. China

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Prof. Tao Cheng

Corresponding Author

Prof. Tao Cheng

Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, 215123 P. R. China

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Prof. Yuanlong Shao

Corresponding Author

Prof. Yuanlong Shao

School of Materials Science and Engineering, Peking University, Beijing, 100871 P. R. China

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First published: 23 March 2023
Citations: 103

Graphical Abstract

The performance of aqueous Zn-ion batteries is improved by regulating the inner Helmholtz plane (IHP) chemistry. Pyridine (Py) as high donor number organic electrolyte additive (only 1 vol. % addition) is used to efficiently regulate the solvation sheath structure, which results in depressed H2O activity at the IHP interface. The thus-formed IHP interface enables a superior stable Zn anode with high reversibility and utilization rate.

Abstract

The performance of aqueous Zn ion batteries (AZIBs) is highly dependent on inner Helmholtz plane (IHP) chemistry. Notorious parasitic reactions containing hydrogen evolution reactions (HER) and Zn dendrites both originate from abundant free H2O and random Zn deposition inside active IHP. Here, we report a universal high donor number (DN) additive pyridine (Py) with only 1 vol. % addition (Py-to-H2O volume ratio), for regulating molecule distribution inside IHP. Density functional theory (DFT) calculations and molecular dynamics (MD) simulation verify that incorporated Py additive could tailor Zn2+ solvation sheath and exclude H2O molecules from IHP effectively, which is in favor of preventing H2O decomposition. Consequently, even at extreme conditions such as high depth of discharge (DOD) of 80 %, the symmetric cell based on Py additive can sustain approximately 500 h long-term stability. This efficient strategy with high DN additives furnishes a promising direction for designing novel electrolytes and promoting the practical application of AZIBs, despite inevitably introducing trace organic additives.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.

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