薄水铝石改善聚氧化乙烯基固态电解质离子电导率的研究

doi:10.19964/j.issn.1006-4990.2024-0684

Abstract

Abstract:

Poly（ethylene oxide）（PEO）-based polymer electrolytes exhibit broad application prospects in the field of all-solid-state sodium-ion batteries due to their ability to dissolve various sodium salts and ease of processing.However，PEO has the defects of high crystallinity and insufficient segmental mobility，resulting in low ionic conductivity at room temperature.This study proposed an effective strategy to address this issue.By incorporating succinonitrile（SN） and boehmite（BM） into the polymer system of PEO and sodium bis（trifluoromethanesulfonyl）imide（NaTFSI）.A composite solid electrolyte（PEO-NaTFSI-SN-BM） with excellent performance was successfully prepared.The mechanism of SN and BM improving the ionic conductivity of solid-state electrolyte was analyzed by using techniques including X-ray diffraction（XRD），Fourier transform infrared spectroscopy（FT-IR），X-ray photoelectron spectroscopy（XPS） and scanning electron microscopy（SEM）.The experimental results demonstrated that，when only SN was added and the molar ratio of SN to EO was 1∶8，a self-supporting membrane（PNS₈） could be formed，significantly increasing the ionic conductivity of the PEO-NaTFSI polymer electrolyte from the initial 2.27×10^-6 S/cm to 4.51×10^-5 S/cm at 30 ℃.Upon further incorporation of BM，the ionic conductivity of the composite solid electrolyte was increased to 6.99×10^-5 S/cm，while simultaneously enhancing the mechanical properties of the electrolyte membrane.In the presence of BM，when the molar ratio of SN to EO was further increased to 1∶4，a self-supporting membrane（PNS₄B₁₀） could still be formed.The ionic conductivity of PNS₄B₁₀ at 30 ℃ reached as high as 1.43×10^-4 S/cm，representing an approximately 60-fold improvement compared to the initial PEO-NaTFSI polymer electrolyte.The introduction of BM not only facilitated ion transport of the solid-state electrolyte，but also enhanced its mechanical properties，thereby enabling higher SN loading and further optimization of ionic conductivity.This composite solid electrolyte represented a promising approach for achieving high ionic conductivity in all-solid-state sodium metal batteries at room temperature.

Key words: boehmite, poly（ethylene oxide）, succinonitrile, ionic conductivity, sodium solid state electrolyte

CLC Number:

TQ133.1

TIAN Peng, YANG Guanglong, MU Chenxi, CHEN Junyi, NING Guiling. Study on enhancement of ionic conductivity in poly（ethylene oxide）-based solid-state electrolytes by boehmite[J]. Inorganic Chemicals Industry, 2025, 57(11): 43-51.

Figures/Tables 5

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Table 1

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References 40

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序号	样品名	n（SN）∶ n（EO）	w（BM）/ %	离子电导率 σ/（S cm^-1）	脱膜难易程度
1	PEO-NaTFSI	0	0	2.27×10^-6	容易
2	PNS₂₄	1∶24	0	1.53×10^-5	容易
3	PNS₁₆	1∶16	0	1.63×10^-5	容易
4	PNS₁₂	1∶12	0	2.30 0×10^-5	容易
5	PNS₈	1∶8	0	4.51×10^-5	容易
6	PNS₇	1∶7	0		困难
7	PNS₄	1∶4	0		无法
8	PNB₁₀	0	10	3.11×10^-6	容易
9	PNS₈B₅	1∶8	5	6.36×10^-5	容易
10	PNS₈B₁₀	1∶8	10	6.99×10^-5	容易
11	PNS₈B₁₅	1∶8	15	6.57×10^-5	容易
12	PNS₈B₂₀	1∶8	20	6.15×10^-5	容易
13	PNS₈B₂₅	1∶8	25	6.02×10^-5	容易
14	PNS₈B₃₀	1∶8	30	5.19×10^-5	容易
15	PNS₇B₁₀	1∶7	10	7.77×10^-5	容易
16	PNS₆B₁₀	1∶6	10	8.99×10^-5	容易
17	PNS₅B₁₀	1∶5	10	1.11×10^-4	容易
18	PNS₄B₁₀	1∶4	10	1.43×10^-4	容易
19	PNS₃B₁₀	1∶3	10		困难

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Inorganic Acid-Base-Salt Committee of CIESC

Study on enhancement of ionic conductivity in poly（ethylene oxide）-based solid-state electrolytes by boehmite

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