Issue 5, 2024

Gradient-integrated bilayer solid polymer electrolyte enabling enhanced room-temperature cyclability for rechargeable lithium metal batteries

Abstract

Simultaneous maintenance of interfacial stability of solid polymer electrolytes (SPEs) towards both high-potential cathodes and highly active Li anodes is still a significant challenge in rechargeable lithium metal batteries (LMBs). In this study, a bilayer SPE was prepared via a facile two-step coating strategy, in which an oxidation-resistant poly(vinylidene fluoride) (PVDF) layer incorporating ionic liquid (IL) and LiODFB additive was used for stabilizing the cathode surface, and a reduction-friendly polyethylene oxide (PEO) layer combined with a suitable amount of succinonitrile (SN) and Li6.4La3Zr1.4Ta0.6O12 (LLZTO) was fabricated for maintaining the anode compatibility. The resultant bilayer SPE possessed a unique architecture of gradient concentration integration with negligible Li+ migration discontinuity across the additional electrolyte interface, providing favorable overall properties in terms of ionic conductivity, Li+ transference number, mechanical strength and thermal stability. Furthermore, the combination effect of the two polymer layers greatly improved the interface properties of the cathode/anode, enabling the LMBs to operate at room temperature with extended cycle life and good rate capability.

Graphical abstract: Gradient-integrated bilayer solid polymer electrolyte enabling enhanced room-temperature cyclability for rechargeable lithium metal batteries

Supplementary files

Article information

Article type
Paper
Submitted
16 Oct 2023
Accepted
17 Jan 2024
First published
14 Feb 2024

Sustainable Energy Fuels, 2024,8, 987-996

Gradient-integrated bilayer solid polymer electrolyte enabling enhanced room-temperature cyclability for rechargeable lithium metal batteries

Y. Yuan, X. Liu, K. Xue, Y. Kong, B. Wang, H. Liu, C. Li, Z. Li, Y. Ma and H. Lu, Sustainable Energy Fuels, 2024, 8, 987 DOI: 10.1039/D3SE01329D

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