High-Performance Mg–O2 Batteries Enabled by Electrospinning PVDF-HFP-Based Quasi-Solid-State Polymer Electrolyte
Journal
Advanced Energy Materials
ISSN
1614-6832
1614-6840
Date Issued
2025-02-05
Author(s)
Vasantan Rasupillai Dharmaraj
Dheeraj Kumar Maurya
Ayan Sarkar
Hsiu‐Hui Su
Yi‐An Chen
Han‐Chen Chen
Yu‐Ping Lin
Ren‐Jei Chung
Abstract
This article reports a high-performance rechargeable battery enabled by an electrospun quasi-solid-state electrolyte (E-QSSE). The E-QSSE, composed of Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP), Mg(NO3)2 salt, and Pyr14TFSI ionic liquid (IL), exhibits high Mg2+ ion transport and interfacial stability. A unique sandwich structure coupling the E-QSSE with a Ruthenium nanoparticles decorated multi-walled carbon nanotubes (Ru/CNT) cathode catalyst on carbon paper significantly augments electrochemical reversibility. The optimized E-QSSE with a 1:1 molar ratio of salt and IL achieves a high room temperature ionic conductivity of 6.39 mS cm−1. The E-QSSE's electrochemical stability window extends up to 3.95 V, showcasing its potential for high-energy-density applications. The Mg-O2 cell, with the optimized E-QSSE, delivers 115 discharge/charge cycles at 100 mA g−1, one of the longest reported cycle-lives for secondary Mg-O2 batteries. The battery exhibits a maximum discharge capacity of 9305 mAh g−1 with 100% Coulombic efficiency. X-ray photoelectron spectroscopy and absorption near-edge structure analyses reveal MgO as the primary discharge product, with MgF2 contributing to stable solid electrolyte interphase. This E-QSSE design promotes efficient Mg2+ ion migration and stable electrochemical reactions. This work advances the development of stable, high-capacity Mg-O2 batteries and can open up avenues for quasi-solid-state electrolytes in post-lithium metal-air battery technologies.
Publisher
Wiley
Type
journal article