Studies on the Effect of Nano-Sized MgO in Magnesium-Ion Conducting Gel Polymer Electrolyte for Rechargeable Magnesium Batteries

Na Wu,Wei Wang,Taohai Li,Yu Wei

doi:10.3390/en10081215

Na Wu, Wei Wang + Show 2 more

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https://doi.org/10.3390/en10081215

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Journal: Energies	Publication Date: Aug 16, 2017
Citations: 20	License type: CC BY 4.0

Affiliation: Hebei Normal University, Xiangtan University

Abstract

Magnesium-ion conducting gel polymer electrolytes (GPEs) with different contents of nano-sized MgO have been prepared and investigated by various electrical and electrochemical techniques. The Mg2+ ion conduction in GPEs was confirmed from cyclic voltammetry and impedance analysis. It was found that doping appropriate nano-sized MgO in the GPE can induce significant improvements in both the electrochemical and the mechanical properties of GPEs. The composite GPE with 7% MgO shows a high ionic conductivity of 4.6 × 10−3 S/cm with electrochemical stability up to 4.7 V versus Mg2+/Mg at room temperature. Furthermore, it is free-standing and flexible with high tensile strength (9.7 ± 0.1 MPa) and elongation at break (91.7 ± 0.2%), further ensuring their potential applications as GPEs for rechargeable Mg batteries.

Highlights

With the increasing demand for energy, people began to pursue advanced energy storage devices [1,2,3,4]
We have studied the performance of thermoplastic polyurethane (TPU)/poly (PVdF) based gel polymer electrolytes (GPEs) in lithium batteries [22,26]
Morphology/Structure and Differential Scanning Calorimeter Analysis interconnected multifibrous layers are found in the samples

Summary

Introduction

With the increasing demand for energy, people began to pursue advanced energy storage devices [1,2,3,4]. Considering the negligible danger and enhanced security, studies on rechargeable magnesium batteries are expected to have ample promise for development in the future [2,3,4,5,6]. Rechargeable Mg batteries suffer from several serious limitations, e.g., metallic Mg/electrolyte incompatibility and lack of suitable Mg2+ ion-conducting electrolytes. It has been reported that the irreversible deposition/dissolution of the Mg electrode in its simple salts/non-aqueous aprotic solvents is caused by the formation of a dense passivation layer on the Mg surface, resulting from its reaction with the electrolyte [5,6,7,8,9,10]. More and more researchers focus on developing solid-state Mg2+. Ion-conducting electrolytes to achieve rechargeability [11,12,13]. Gel polymer electrolyte (GPE), which is an important part component of solid-state Mg-batteries, is an excellent substitute for liquid electrolyte

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