A design of Nafion-coated bilayered quasi-solid electrolyte for lithium-O2 batteries with high performance

• 作者: Yingfei Hou Lin Jiang Yaoyao Zhang Zhiwen Qin Chi Jiang Ming Wang
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: Energy Science and Technology
• 页码范围: 208-216
• 页数: 9页
• 语种: 英文

摘要

Lithium-air(also known as lithium-oxygen)batteries have attracted considerable global attention in recent years due to their extremely high energy density(11,140 W h·kg-1).The electrolyte is a key ele-ment in lithium-air batteries and the traditional organic electrolyte has great safety risk due to leakage.On the contrary,the polymer electrolyte has the advantages of high safety,high stability and easy pro-cessing comparing with the organic liquid electrolytes.In this paper,a new idea was proposed to coat the Nafion membrane on a layer of polymer for blocking the oxidation reduction electric(RM)and Li based on the selective permeability on lithium ion of the Nafion membrane.Self-made thickness-controllable Nafion membrane,polyvinylidene fluoride-hexafluoropropylene copolymer(PVDF-HFP)and 2,2,6,6-tetramethylpiperidinooxy(TEMPO)were used to prepare a quasi solid polymer electrolyte(NSPE).Electrochemical workstation and LAND battery testing system were used to perform a galvano-static charge/discharge test on Li-O2.The ionic conductivity of NSPE was 4.3×10-4 S·cm-1 at room tem-perature and the discharge platform was 2.6 V and the charging voltage was 3.7 V after 50 cycles with the cut-off capacity of 500 mA·h·g-1.