Application of poly（ethylene glycol） methyl ether acrylate in all-solid-state batteries

doi:10.19799/j.cnki.2095-4239.2022.0406

Abstract

Abstract:

Solid polymer electrolyte is one of the critical materials in all solid polymer lithium-ion batteries. The main challenge for solid polymer electrolytes is their low conductivity and poor electrochemical stability. In this study, a novel solid polymer electrolyte named PMEA@SSE) was prepared by combining poly (ethylene glycol) methyl ether acrylate (PMEA) with polyethylene oxide (PEO), based on the Li⁺-conducting mechanism of polymer electrolyte. PEO electrolyte (PEO@SSE) was prepared as the control sample. The PMEA@SSE was evaluated by Fourier transform infrared spectrometer, electrochemical impedance spectroscopy, linear sweep voltammetry, scanning electron microscope, energy dispersive spectrometer, X-ray diffraction, and cell testing. The results revealed that the electrochemical stability window of PMEA@SSE was similarly higher than that of PEO@SSE (4.2 V vs. 3.8 V) and that the ion conductivity of PMEA@SSE was higher than that of PEO@SSE (0.13 mS/cm vs 0.018 mS/cm, tested at 30 ℃). Furthermore, the solid-state battery prepared using PMEA@SSE exhibited better cycle performance than PEO@SSE (77 vs. 31 cycles with a capacity retention of 80%). This work demonstrates that partially replacing PEO with PMEA is a feasible strategy for advancing the classical PEO solid electrolyte for application in all solid lithium batteries and provides new insights for further developing solid polymer electrolytes.

Key words: solid polymer electrolyte, poly (ethylene glycol) methyl ether acrylate, solid-state battery

CLC Number:

TM 911

Suli LI, Peng WU, Yirong XIAO, Peiwen YU, Yuede PAN, Wen YANG. Application of poly（ethylene glycol） methyl ether acrylate in all-solid-state batteries[J]. Energy Storage Science and Technology, 2022, 11(12): 3768-3775.

Figures/Tables 13

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样品信息	PMEA@SSE	PEO@SSE
厚度/cm	0.0175	0.0372
接触面积/cm²	1.96	1.96
30 ℃电阻/Ω	68.01	1051
60 ℃电阻/Ω	31.34	91.16
30 ℃电导率/(S/cm)	1.31×10^-4	1.81×10^-5
60 ℃电导率/(S/cm)	2.85×10^-4	2.08×10^-4

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