Optimizing Lithium-Ion Battery Discharge Capacity Performance by Nanosilica-Modified Poly (Vinyl Alcohol) Separator

IF 4.7 3区工程技术 Q2 ENGINEERING, ENVIRONMENTAL Journal of Polymers and the Environment Pub Date : 2024-05-28 DOI:10.1007/s10924-024-03320-7

Ali Shahbazi, Mohammad Fasihi, Hasan Farrokhzad, Ali Yavari

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Abstract

In this research, pure and composite separators based on poly (vinyl alcohol) (PVA) and silica nanoparticles were made by using non-solvent induced phase separation (NIPS) method. The research carried out includes examining Field emission scanning electron microscopy (FESEM) images, pores diameter distribution, porosity measurement, electrolyte uptake, electrolyte retention, contact angle with electrolyte, thermal shrinkage, X-ray Diffraction (XRD) analysis, Energy dispersive X-ray spectroscopy (EDX) analysis and charge and discharge analysis of the resulting lithium-ion batteries. The results obtained indicate improved performance, with increased polymer or silica concentrations leading to enhanced pore characteristics and lithium-ion battery discharge capacity density. According to the battery charge and discharge analysis, at rates of 0.1 C, 0.2 C, 0.5 C the discharge capacity density for a lithium-ion battery consisting of commercial PP separator (Celgard 2500) was 180, 172, 166 mA h g⁻¹ and for optimized composite separator was 200, 188, 174 mA h g⁻¹.

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纳米二氧化硅改性聚乙烯醇隔膜优化锂离子电池放电容量性能

本研究采用非溶剂诱导相分离（NIPS）方法，制作了基于聚乙烯醇（PVA）和纳米二氧化硅的纯分离器和复合分离器。研究内容包括：场发射扫描电子显微镜（FESEM）图像、孔径分布、孔隙率测量、电解液吸收、电解液保留、与电解液的接触角、热收缩、X 射线衍射（XRD）分析、能量色散 X 射线光谱（EDX）分析以及所得锂离子电池的充放电分析。结果表明，随着聚合物或二氧化硅浓度的增加，孔隙特性和锂离子电池放电容量密度都得到了提高。根据电池充放电分析，在 0.1 摄氏度、0.2 摄氏度和 0.5 摄氏度的条件下，由商用聚丙烯隔膜（Celgard 2500）组成的锂离子电池的放电容量密度分别为 180、172 和 166 mA h g-1，而优化复合隔膜的放电容量密度分别为 200、188 和 174 mA h g-1。

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来源期刊

Journal of Polymers and the Environment 工程技术-高分子科学

CiteScore

9.50

自引率

7.50%

发文量

297

审稿时长

9 months

期刊介绍： The Journal of Polymers and the Environment fills the need for an international forum in this diverse and rapidly expanding field. The journal serves a crucial role for the publication of information from a wide range of disciplines and is a central outlet for the publication of high-quality peer-reviewed original papers, review articles and short communications. The journal is intentionally interdisciplinary in regard to contributions and covers the following subjects - polymers, environmentally degradable polymers, and degradation pathways: biological, photochemical, oxidative and hydrolytic; new environmental materials: derived by chemical and biosynthetic routes; environmental blends and composites; developments in processing and reactive processing of environmental polymers; characterization of environmental materials: mechanical, physical, thermal, rheological, morphological, and others; recyclable polymers and plastics recycling environmental testing: in-laboratory simulations, outdoor exposures, and standardization of methodologies; environmental fate: end products and intermediates of biodegradation; microbiology and enzymology of polymer biodegradation; solid-waste management and public legislation specific to environmental polymers; and other related topics.