A Safe and Non-flammable Sodium Metal Battery Based on an Ionic Liquid Electrolyte

Overview

Journal Nat Commun

Specialty Biology

Date 2019 Jul 26

PMID 31341162

Citations 13

Authors

Hao Sun

Guanzhou Zhu

Xintong Xu

Meng Liao

Yuan-Yao Li

Michael Angell

Meng Gu

Yuanmin Zhu

Wei Hsuan Hung

Jiachen Li

Yun Kuang

Yongtao Meng

Meng-Chang Lin

Huisheng Peng

Hongjie Dai

Affiliations

Soon will be listed here.

Abstract

Rechargeable sodium metal batteries with high energy density could be important to a wide range of energy applications in modern society. The pursuit of higher energy density should ideally come with high safety, a goal difficult for electrolytes based on organic solvents. Here we report a chloroaluminate ionic liquid electrolyte comprised of aluminium chloride/1-methyl-3-ethylimidazolium chloride/sodium chloride ionic liquid spiked with two important additives, ethylaluminum dichloride and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide. This leads to the first chloroaluminate based ionic liquid electrolyte for rechargeable sodium metal battery. The obtained batteries reached voltages up to ~ 4 V, high Coulombic efficiency up to 99.9%, and high energy and power density of ~ 420 Wh kg and ~ 1766 W kg, respectively. The batteries retained over 90% of the original capacity after 700 cycles, suggesting an effective approach to sodium metal batteries with high energy/high power density, long cycle life and high safety.

Citing Articles

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