Understanding the Effect of UV-Induced Cross-Linking on the Physicochemical Properties of Highly Performing PEO/LiTFSI-Based Polymer Electrolytes

被引：117

作者：

Falco, Marisa ^{[1
]}

Simari, Cataldo ^{[2
]}

Ferrara, Chiara ^{[3
]}

Nair, Jijeesh Ravi ^{[4
,5
]}

Meligrana, Giuseppina ^{[1
]}

Bella, Federico ^{[1
]}

Nicotera, Isabella ^{[2
]}

Mustarelli, Piercarlo ^{[6
]}

Winter, Martin ^{[4
,5
]}

Gerbaldi, Claudio ^{[1
]}

机构：

[1] Politecn Torino, Dept Appl Sci & Technol DISAT, GAME Lab, Corso Duca Abruzzi 24, I-10129 Turin, Italy

[2] Univ Calabria, Dipartimento Chim & Tecnol Chim, Via P Bucci, I-87036 Arcavacata Di Rende, CS, Italy

[3] Univ Pavia, INSTM, Dept Chem, Via Taramelli 16, I-27100 Pavia, Italy

[4] Univ Munster, Forschungszentrum Julich, Helmholtz Inst Munster HI MS, Corrensstr 46, D-48149 Munster, Germany

[5] Univ Munster, MEET Battery Res Ctr, Corrensstr 46, D-48149 Munster, Germany

[6] Univ Milano Bicocca, Dept Mat Sci, Via Cozzi 55, I-20125 Milan, Italy

来源：

LANGMUIR | 2019年 / 35卷 / 25期

关键词：

PMMA-PVDF BLEND; LITHIUM-ION; POLY(ETHYLENE OXIDE); BATTERIES; CONDUCTIVITY; COMPLEXES; METAL; TRANSPORT; DYNAMICS; SOLVENTS;

D O I：

10.1021/acs.langmuir.9b00041

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report a thorough, multitechnique investigation of the structure and transport properties of a UV-cross-linked polymer electrolyte based on poly(ethylene oxide), tetra(ethylene glycol)dimethyl ether (G4), and lithium bis-(trifluoromethane)sulfonimide. The properties of the cross linked polymer electrolyte are compared to those of a non cross-linked sample of same composition. The effect of UV induced cross-linking on the physico/chemical characteristics is evaluated by X-ray diffraction, differential scanning calorimetry, shear rheology, and Li-7 magic angle spinning nuclear magnetic resonance (NMR) spectroscopy, F-19 and Li-7 pulsed field gradient stimulated echo NMR analyses, electrochemical impedance spectroscopy, and Fourier transform Raman spectroscopy. Comprehensive analysis confirms that UV-induced cross-linking is an effective technique to suppress the crystallinity of the polymer matrix and reduce ion aggregation, yielding improved Li+ transport number (>0.5) and ionic conductivity (>0.1 mS cm(-1)) at ambient temperature, by tailoring the structural/morphological characteristics of the polymer matrix. Finally, the polymer electrolyte allows reversible operation with stable profile for hundreds of cycles upon galvanostatic test at ambient temperature of LiFePO4-based lithium-metal cells, which deliver full capacity at 0.05 or 0.1C current rate and keep high rate capabilities up to 1C. This enforces the role of UV-induced cross-linking in achieving excellent electrochemical characteristics, exploiting a practical, easy up-scalable process.

引用

页码：8210 / 8219

页数：10

共 47 条

[1] A novel method to measure the glass and melting transitions of pharmaceutical powders [J].