Enhancing lithium-ion conductivity: impact of hausmannite nanofiller on PVDF–HFP/PEG blend nanocomposite polymer electrolytes

IF 5.2 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Khizar Hayat Khan, Aneesa Zafar, Haroon Rashid, Iftikhar Ahmad, Gul Shahzada Khan and Hazrat Hussain
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Abstract

A new series of PVDF–HFP/PEG-based nanocomposite polymer electrolytes (NCPEs) have been fabricated using hausmannite (Mn3O4) nanoparticles as the nanofiller and LiClO4 as the lithium-ion source via the solvent casting method. A pristine PVDF–HFP NCPE sample with 2 wt% nanofiller was also prepared for comparison. The Mn3O4 nanoparticles were synthesized by the precipitation method using CTAB as a templating agent and MnCl2·4H2O as the precursor. FTIR spectroscopy showed that while pristine PVDF–HFP forms a nonpolar α-phase, the incorporation of salt and nanofiller induced a mixed β and γ crystal phase, indicating interaction between the matrix and additives. Surface morphology studies showed that the NCPEs had a denser surface than pristine PVDF–HFP, with no PEG spherulite formation detected in polarized optical micrographs. Electrochemical impedance spectroscopy revealed that the 2% blend NCPE exhibited the highest ion conductivity of 3.1 × 10−4 S cm−1 at 80 °C, an order of magnitude higher than the pristine NCPE (5.1 × 10−5 S cm−1). Temperature-dependent ion conductivity followed Arrhenius behavior, indicating a thermally activated ion hopping mechanism. The dielectric relaxation peak shifted to higher frequency with increasing temperature, suggesting faster ion dynamics and improved conductivity.

Abstract Image

增强锂离子电导率:豪斯曼尼特纳米填料对PVDF-HFP /PEG共混纳米复合聚合物电解质的影响
采用溶剂浇铸法制备了PVDF-HFP / peg基纳米复合聚合物电解质(NCPEs),以锰氧化锰(Mn3O4)为纳米填料,LiClO4为锂离子源。一个原始的PVDF-HFP NCPE样品与2 wt%的纳米填料也准备进行比较。以CTAB为模板剂,MnCl2·4H2O为前驱体,采用沉淀法合成纳米Mn3O4。FTIR光谱分析表明,原始PVDF-HFP形成了非极性α-相,而盐和纳米填料的掺入则形成了混合的β和γ晶体相,表明基体与添加剂之间存在相互作用。表面形貌研究表明,NCPEs比原始PVDF-HFP具有更致密的表面,偏振光学显微照片中没有检测到PEG球晶的形成。电化学阻抗谱显示,在80°C时,2%共混NCPE的离子电导率最高,为3.1 × 10−4 S cm−1,比原始NCPE (5.1 × 10−5 S cm−1)高出一个数量级。温度相关的离子电导率遵循Arrhenius行为,表明热激活的离子跳变机制。随着温度的升高,介质弛豫峰向更高的频率移动,表明离子动力学更快,电导率提高。
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来源期刊
Materials Advances
Materials Advances MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
7.60
自引率
2.00%
发文量
665
审稿时长
5 weeks
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