Hot‐Pressing Enhances Mechanical Strength of PEO Solid Polymer Electrolyte for All‐Solid‐State Sodium Metal Batteries

Author:

Zhao Lanqing1,Hou Minjie1,Ren Kun1,Yang Dongrong1,Li Fupeng1,Yang Xiecheng1,Zhou Yingjie1,Zhang Da123,Liu Shan4,Lei Yong5,Liang Feng123ORCID

Affiliation:

1. Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province Kunming University of Science and Technology Kunming 650093 China

2. National Engineering Research Center of Vacuum Metallurgy Kunming University of Science and Technology Kunming 650093 China

3. Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China

4. School of Chemical Engineering North China University of Science and Technology Tangshan 063009 China

5. Fachgebiet Angewandte Nanophysik InstitutfürPhysik & IMNMacroNano Technische Universität Ilmenau 98693 Ilmenau Germany

Abstract

AbstractPoly(ethylene oxide) (PEO)‐based solid polymer electrolytes (SPEs) are widely utilized in all‐solid‐state sodium metal batteries (ASSSMBs) due to their excellent flexibility and safety. However, poor ionic conductivity and mechanical strength limit its development. In this work, an emerging solvent‐free hot‐pressing method is used to prepare mechanically robust PEO‐based SPE, while sodium superionic conductors Na3Zr2Si2PO12 (NZSP) and NaClO4 are introduced to improve ionic conductivity. The as‐prepared electrolyte exhibits a high ionic conductivity of 4.42 × 10−4 S cm−1 and a suitable electrochemical stability window (4.5 V vs Na/Na+). Furthermore, the SPE enables intimate contact with the electrode. The Na||Na3V2(PO4)3@C ASSSMB delivers a high‐capacity retention of 97.1% after 100 cycles at 0.5 C and 60 °C, and exhibits excellent Coulombic efficiency (CE) (close to 100%). The ASSSMB with the 20 µm thick electrolyte also demonstrates excellent cyclic stability. This study provides a promising strategy for designing stable polymer‐ceramic composite electrolyte membranes through hot‐pressing to realize high‐energy‐density sodium metal batteries.

Funder

National Natural Science Foundation of China

Publisher

Wiley

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