High-thermal-stability PA6T separators via non-solvent induced phase separation for high-performance supercapacitors

IF 3.9 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-06-30 DOI:10.1016/j.mseb.2025.118563

Qiang Shi , Meiyan Liu , Haiyan Zhang , Wanjun Liu , Jiankui Sun , Xiufang Sun , Zijin Wang

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Abstract

A heat-resistant semi-aromatic polyamide PA6T separator was successfully fabricated via non-solvent induced phase inversion using concentrated sulfuric acid as the solvent, demonstrating significant potential for supercapacitor applications. Optimized fabrication conditions-a 50:50 Na₂SO₄/glycerol coagulation bath and a 7 % PA6T/5% glycerol casting solution-yielded a thermally robust separator with zero shrinkage at 170 °C after 60 min. The PA6T-7 % separator demonstrated exceptional electrochemical properties: 10.4 mS/cm ionic conductivity, 240.1F/g specific capacitance at 0.1 A/g, and 86.2 % capacitance retention at 5 A/g. It maintained 97.8 % capacitance over 1,000 cycles at 0.5 A/g, supported by its optimized porous structure (91.3 % porosity, 45.7° contact angle, 70.4 % electrolyte uptake). Combining thermal resilience, facile processing, and stable charge storage, this material shows great potential as a next-generation separator for high-power energy storage systems.

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高性能超级电容器用非溶剂诱导相分离的高热稳定性PA6T分离器

以浓硫酸为溶剂，通过非溶剂诱导相转化法制备了耐热的半芳香族聚酰胺PA6T隔膜，具有重要的超级电容器应用潜力。优化的制造条件——50:50的Na2SO4/甘油混凝浴和7% PA6T/5%甘油铸造溶液——在170°C下60分钟后产生了热坚固的分离器，零收缩率。PA6T- 7%分离器具有优异的电化学性能：10.4 mS/cm离子电导率，0.1 a /g时的240.1F/g比电容，以及5a /g时的86.2 %电容保持率。在0.5 A/g下，在1000次循环中，它的电容保持在97.8%，这得益于其优化的多孔结构（孔隙率91.3%，接触角45.7°，电解质吸收率70.4%）。结合热弹性，易于处理和稳定的电荷存储，这种材料显示出作为下一代高功率储能系统隔膜的巨大潜力。

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.