Volume 135, Issue 35 e202306325
Forschungsartikel

Polyolefin-Based Separator with Interfacial Chemistry Regulation for Robust Potassium Metal Batteries

Long Tu

Long Tu

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

These authors contributed equally to this work.

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Zhijia Zhang

Zhijia Zhang

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

Department of Physics and Astronomy, University of Manchester, Manchester, M13 9PL UK

These authors contributed equally to this work.

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Zelin Zhao

Zelin Zhao

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Xinyuan Xiang

Xinyuan Xiang

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Prof. Bohua Deng

Prof. Bohua Deng

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Prof. Dan Liu

Prof. Dan Liu

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Prof. Deyu Qu

Prof. Deyu Qu

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Prof. Haolin Tang

Prof. Haolin Tang

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Prof. Junsheng Li

Corresponding Author

Prof. Junsheng Li

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

Hubei Provincial Key Laboratory of Fuel Cell, Wuhan University of Technology, Wuhan, 430070 P. R. China

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Prof. Jinping Liu

Corresponding Author

Prof. Jinping Liu

School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan, 430070 P. R. China

State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 P. R. China

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First published: 04 July 2023

Abstract

Potassium metal batteries (KMBs) are ideal choices for high energy density storage system owing to the low electrochemical potential and low cost of K. However, the practical KMB applications suffer from intrinsically active K anode, which would bring serious safety concerns due to easier generation of dendrites. Herein, to explore a facile approach to tackle this issue, we propose to regulate K plating/stripping via interfacial chemistry engineering of commercial polyolefin-based separator using multiple functional units integrated in tailored metal organic framework. As a case study, the functional units of MIL-101(Cr) offer high elastic modulus, facilitate the dissociation of potassium salt, improve the K+ transfer number and homogenize the K+ flux at the electrode/electrolyte interface. Benefiting from these favorable features, uniform and stable K plating/stripping is realized with the regulated separator. Full battery assembled with the regulated separator showed ~19.9 % higher discharge capacity than that with glass fiber separator at 20 mA g−1 and much better cycling stability at high rates. The generality of our approach is validated with KMBs using different cathodes and electrolytes. We envision that the strategy to suppress dendrite formation by commercial separator surface engineering using tailor-designed functional units can be extended to other metal/metal ion batteries.

Conflict of interest

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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