A Crosslinked Polytetrahydrofuran-Borate-Based Polymer Electrolyte Enabling Wide-Working-Temperature-Range Rechargeable Magnesium Batteries

Aobing Du, Huanrui Zhang, Zhonghua Zhang, Jingwen Zhao, Zili Cui, Yimin Zhao, Shanmu Dong, Longlong Wang, Xinhong Zhou, Guanglei Cui

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

A polymer-based magnesium (Mg) electrolyte is vital for boosting the development of high-safety and flexible Mg batteries by virtue of its enormous advantages, such as significantly improved safety, potentially high energy density, ease of fabrication, and structural flexibility. Herein, a novel polytetrahydrofuran-borate-based gel polymer electrolyte coupling with glass fiber is synthesized via an in situ crosslinking reaction of magnesium borohydride [Mg(BH 4 ) 2 ] and hydroxyl-terminated polytetrahydrofuran. This gel polymer electrolyte exhibits reversible Mg plating/stripping performance, high Mg-ion conductivity, and remarkable Mg-ion transfer number. The Mo 6 S 8 /Mg batteries assembled with this gel polymer electrolyte not only work well at wide temperature range (−20 to 60 °C) but also display unprecedented improvements in safety issues without suffering from internal short-circuit failure even after a cutting test. This in situ crosslinking approach toward exploiting the Mg-polymer electrolyte provides a promising strategy for achieving large-scale application of Mg-metal batteries.

Original languageEnglish
Article number1805930
JournalAdvanced Materials
Volume31
Issue number11
DOIs
StatePublished - 15 Mar 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • borates
  • in situ crosslinking reaction
  • magnesium batteries
  • polymer electrolytes
  • polytetrahydrofuran

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