Preparation of flexible porous γ-Al2O3 nanofibers by electrospinning and its application in supercapacitor separator

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY Journal of Solid State Electrochemistry Pub Date : 2024-08-19 DOI:10.1007/s10008-024-06047-6
Jiajie Wen, Kechen Li, Kaizheng Xu, Runkang Li, Dongfeng Lv, Yi Cui, Yuejun Chen, Yingna Wei, Yang Yu, Yun Yu, Hengyong Wei
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Abstract

In this paper, a 150-µm-thick flexible γ-Al2O3 nanofiber separator with the tensile strength of 0.22 MPa was prepared from the low-cost aluminum chloride hydroxide/polyvinyl alcohol (PVA)/water precursor materials by electrospinning method. The resultant separator with 3D interconnection nanostructure revealed fiber diameters in the range of 200 to 500 nm. The specific surface area, porosity, and electrolyte uptake of γ-Al2O3 nanofiber separator are 31.5 m2/g, 55%, and 1021%, higher than that of commercial polypropylene (PP) separator and glass fiber (GF) separator. The supercapacitor assembled with the γ-Al2O3 nanofiber separator exhibited a high discharge specific capacitance of 93 F/g at the current density of 1A/g, and there is almost no capacity decay after 10,000 cycles. The energy density of supercapacitor assembled with γ-Al2O3 nanofiber separator is 31.7 Wh/kg at the power density of 562.6 W/kg. Meanwhile, the rate performance of the supercapacitor is improved significantly due to the existence of porous structure and low ion diffusion resistance (0.78 Ω) of γ-Al2O3 nanofiber separator. In addition, the thermal performance of the γ-Al2O3 nanofiber separator is also excellent, which has almost no shrinkage at the temperature of 200 °C and cannot be ignited. Therefore, the obtained γ-Al2O3 nanofibers could serve as a promising alternative separator for a new generation of safe, high-power supercapacitors.

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电纺丝法制备柔性多孔γ-Al2O3 纳米纤维及其在超级电容器分离器中的应用
本文利用低成本的氢氧化铝/聚乙烯醇(PVA)/水前驱体材料,通过电纺丝方法制备了 150 微米厚的柔性 γ-Al2O3 纳米纤维隔板,其抗拉强度为 0.22 兆帕。所制备的分离器具有三维互连纳米结构,纤维直径在 200 至 500 nm 之间。与商用聚丙烯(PP)隔膜和玻璃纤维(GF)隔膜相比,γ-Al2O3 纳米纤维隔膜的比表面积、孔隙率和电解质吸收率分别高出 31.5 m2/g、55% 和 1021%。使用γ-Al2O3 纳米纤维隔板组装的超级电容器在电流密度为 1A/g 时具有 93 F/g 的高放电比电容,并且在 10,000 次循环后几乎没有电容衰减。使用γ-Al2O3 纳米纤维隔膜组装的超级电容器在功率密度为 562.6 W/kg 时的能量密度为 31.7 Wh/kg。同时,由于γ-Al2O3 纳米纤维隔膜具有多孔结构和较低的离子扩散阻力(0.78 Ω),超级电容器的速率性能显著提高。此外,γ-Al2O3 纳米纤维隔膜的热性能也很好,在 200 ℃ 的温度下几乎没有收缩,并且不会被点燃。因此,所获得的γ-Al2O3 纳米纤维可作为新一代安全、高功率超级电容器的替代隔膜。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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