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A functionalized membrane for lithium-oxygen batteries to suppress the shuttle effect of redox mediators

Abstract

Redox mediators (RMs) are widely applied in lithium-oxygen (Li-O2) batteries as it can offer an alternative way where the directly electrochemical oxidization of Li2O2 is avoided when charging, thus greatly reduce the charge overpotential. Unfortunately, the defenseless Li-metal anode would be severely corroded by the oxidized RMs that shuttle from the cathode side, resulting in the low utilization of RMs and poor cycling stability. Herein, a functionalized double guaranteed NPG membrane with electrostatic repulsion and steric hindrance characteristics is proposed to suppress the shuttle effect of LiI RM. Benefiting from the interaction between the O atoms in PEO and the sulfonic acid groups in Nafion as well as the two-dimensional skeleton structure of graphene, Nafion, PEO and graphene can couple with each other forming a large network barrier with multi-functional properties. As expected, the LiI-based Li-O2 batteries with NPG membrane can offer a smooth iodine-free Li anode surface after many cycles and deliver an ultrahigh discharge capacity of ~26917 mA h g-1 at a current density of 200 mA g-1 and an ultralong cycle life (472 cycles) at 500 mA g-1 with a cutoff capacity of 500 mA h g-1, which is far better than that of the bare ones.

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Supplementary files

Publication details

The article was received on 23 Mar 2019, accepted on 16 May 2019 and first published on 17 May 2019


Article type: Paper
DOI: 10.1039/C9TA03133B
J. Mater. Chem. A, 2019, Accepted Manuscript

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    A functionalized membrane for lithium-oxygen batteries to suppress the shuttle effect of redox mediators

    Z. Chen, X. Lin, H. Xia, Y. Hong, X. Liu, S. Cai, J. Duan, J. Yang, Z. Zhou, J. Chang, M. Zheng and Q. Dong, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C9TA03133B

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