Structural and electrochemical properties of montmorillonite-poly(ethylene oxide) intercalated nanocomposites for lithium-ion batteries

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

International Journal of Polymer Analysis and Characterization Pub Date : 2023-04-01 DOI:10.1080/1023666X.2023.2207867

A.K. Nath , B. Sharma , B.J. Borah , N. Deka , J. Hazarika

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Abstract

Poly(ethylene oxide) has been intercalated inside the interlayer galleries of montmorillonite clay and the electrochemical properties of the nanocomposite have been investigated. Interlayer spacing and clay gallery width increase with increasing MMT concentration confirming intercalation of PEO into MMT as observed from XRD results. The fraction of free anions as calculated from FTIR, increases with increasing clay content and remains constant beyond 7.5 wt. % of clay content. Ionic conductivity of the order of 10⁻⁴ Scm⁻¹ has been obtained in the case of MMT based electrolytes. The initial increase of conductivity with increasing MMT content can be attributed to the increase fraction of free ions which eventually increases ionic conductivity. After 7.5 wt. % of MMT loading ionic conductivity decreases due to the high viscosity of MMT. Interfacial stability results show that passivation takes place very slowly in MMT based electrolytes. Dielectric properties show that at high frequency relaxation takes place due to the segmental motion of polymer chains and it proves the hopping of ions.

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锂离子电池用蒙脱石-聚环氧乙烷嵌层纳米复合材料的结构与电化学性能

将聚环氧乙烷嵌入蒙脱土的层间孔中，并对其电化学性能进行了研究。随着MMT浓度的增加，层间间距和土廊宽度增大，证实了PEO嵌入MMT的事实。根据FTIR计算，自由阴离子的比例随着粘土含量的增加而增加，并在7.5 wt以上保持不变。%的粘土含量。在MMT基电解质的情况下，离子电导率为10−4 Scm−1。随着MMT含量的增加，电导率的初始增加可归因于自由离子的增加，最终离子电导率增加。在7.5磅后。由于MMT的高粘度，负载离子电导率降低。界面稳定性结果表明，在基于MMT的电解质中，钝化过程非常缓慢。介电性质表明，在高频下，聚合物链的节段运动引起弛豫，证明了离子的跳变。

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来源期刊

International Journal of Polymer Analysis and Characterization 化学-高分子科学

CiteScore

3.50

自引率

5.30%

发文量

审稿时长

1.6 months

期刊介绍： The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.