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Issue 5, 2020
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Effectively suppressing lithium dendrite growth via an es-LiSPCE single-ion conducting nano fiber membrane

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Abstract

Lithium metal is a potential candidate for next-generation anode materials. However, the practical application of a lithium metal anode has been hindered by uncontrolled dendrite formation. Herein, a cost-effective single lithium ion conducting polymer electrolyte membrane based on a highly porous lithium sulfonated polyether ether ketone electrospun nanofiber membrane (es-LiSPCE) is designed to serve as both a separator and a lithium ion conductor. Impregnation of the ethylene carbonate (EC)/dimethyl carbonate (DMC) (v/v = 1 : 1) solvent mixture and 1 M LiFP6 in EC/PC (v/v = 1 : 1) yields gel pure es-LiSPCE and es-LiSPCE/1 M LiFP6 in an EC/PC (v/v = 1 : 1) membrane, respectively, which display high ionic conductivity, low interfacial compatibility and a high lithium ion transference number. Combined scanning electron microscopy (SEM) images and the long-term stripping/plating cycling test of lithium foil confirm that such a membrane is greatly favorable for inhibiting the formation of a concentration gradient and thus suppressing lithium dendrite growth. In addition, the fully aromatic polyether ether ketone backbone enables high thermal dimensional stability and high polarity and high polarity enables fast electrolyte wetting of the es-LiSPCE membrane. Notably, Li/LiFePO4 cells fabricated using es-LiSPCE membranes demonstrate promising rate capacity at 6C, and excellent electrochemical stability for 1500 cycles even at 6C. Therefore, it is believed that such an electrolyte can serve as an alternative to conventional polyolefin-based separators for high energy density lithium metal batteries.

Graphical abstract: Effectively suppressing lithium dendrite growth via an es-LiSPCE single-ion conducting nano fiber membrane

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Supplementary files

Article information


Submitted
21 Nov 2019
Accepted
16 Dec 2019
First published
13 Jan 2020

J. Mater. Chem. A, 2020,8, 2518-2528
Article type
Paper

Effectively suppressing lithium dendrite growth via an es-LiSPCE single-ion conducting nano fiber membrane

Y. He, J. Wang, Y. Zhang, S. Huo, D. Zeng, Y. Lu, Z. Liu, D. Wang and H. Cheng, J. Mater. Chem. A, 2020, 8, 2518
DOI: 10.1039/C9TA12783F

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