Issue 45, 2021

A scaffold membrane of solid polymer electrolytes for realizing high-stability and dendrite-free lithium-metal batteries

Abstract

High stability and uniform Li deposition are essential for realizing applications of Li-metal batteries (LMBs). Therefore, a scaffold for polymer electrolytes is designed to achieve highly stable operation and dendrite-free Li deposition. A porous membrane of poly(vinylidene fluoride-co-hexafluoropropylene) (PVdF-HFP) is synthesized as a scaffold to host a networked poly(ethylene oxide) (PEO)-based solid polymer electrolyte (NSPE) and form a scaffold-hosted electrolyte (NSPE@PF) that exhibits a considerably higher ionic conductivity and Li+-transference number at 30 °C than the reported PEO-based solid polymer electrolytes do. The PVdF-HFP scaffold renders the NSPE@PF electrochemically stable until 5.4 V (vs. Li/Li+). The PVdF-HFP membrane facilitates uniform Li deposition on both Cu- and Li-metal anodes with negligible dendrite growth in both solid-polymer and liquid electrolyte systems. LMBs containing the NSPE@PF exhibit high capacities and a high cycling stability of up to 1100 cycles. The high-dielectric feature of the PVdF-HFP scaffold facilitates counter-ion-pair dissociation and extends the stable voltage range. Its anion-tethering ability minimizes the space-charge zones on the Li-anode surface and suppresses Li-dendrite growth. Moreover, the high mechanical strength of the scaffold facilitates the synthesis of thin and practically usable NSPE@PFs. This scaffold design is promising for realizing LMB applications.

Graphical abstract: A scaffold membrane of solid polymer electrolytes for realizing high-stability and dendrite-free lithium-metal batteries

Supplementary files

Article information

Article type
Paper
Submitted
11 aug 2021
Accepted
07 okt 2021
First published
07 okt 2021

J. Mater. Chem. A, 2021,9, 25408-25417

A scaffold membrane of solid polymer electrolytes for realizing high-stability and dendrite-free lithium-metal batteries

H. T. T. Nguyen, D. H. Nguyen, Q. Zhang, Y. Lee, J. Jan, C. Chiu and H. Teng, J. Mater. Chem. A, 2021, 9, 25408 DOI: 10.1039/D1TA06838E

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