Mask‐Based Separator with Sustained‐Release LiNO3 as Dendrite Growth Barrier for Potassium Metal Battery

Author:

Mou Peizhi1ORCID,Zhang Liyuan12ORCID,Lu Cheng2,Luo Yusheng1,Yuan Wenlu1,Li Laiping1,Chen Yong1,Shen Zhen2,Xu Jiaxin1,Shu Jie1

Affiliation:

1. School of Materials Science and Chemical Engineering Ningbo University 315211 Ningbo China

2. Zhejiang Institute of Product Quality and Safety Science 310000 Hangzhou China

Abstract

AbstractSeparators with low‐cost, superior mechanical properties, such as nanofiber materials, are considered a viable option for solving the dendritic problem in alkali metal batteries. Consuming the dendrites rather than blocking them underpins the long‐life stable cycle performance of the cell. Herein, a five‐layer structural separator (LiNO3@PVDF@mask) is presented, in which a mask is used as a framework and the polyvinylidene fluoride (PVDF) layer loaded with LiNO3 can generate a passivation layer by reacting with K dendrites. In the case of potassium metal batteries, for example, the LiNO3@PVDF@mask separator has excellent mechanical properties that can effectively cope with the hazards caused by the K dendrite. In addition, sustained‐release LiNO3 can react with penetrated K dendrites to form inactive substances like KNO3 and K2O, blocking further dendrite growth. Importantly, the LiNO3@PVDF@mask separator uses a low‐cost abundant mask and possesses excellent wettability of electrolyte with a reduced amount of liquid electrolyte, enabling one to further iron out cost problems. This study opens up a new direction for research and contributes to practical applications of flexible devices for rechargeable alkaline metal batteries.

Funder

National Natural Science Foundation of China

Natural Science Foundation of Zhejiang Province

Publisher

Wiley

Subject

General Materials Science,Renewable Energy, Sustainability and the Environment

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