摘要
相较于传统腐蚀电极箔,粉末积层型电极箔在综合性能指标上具有显著优势,其制备工艺更具环境友好特性。国内外学者已对粉末积层型电极箔的制备工艺开展了系统研究,但烧结温度这一关键参数对其性能的调控机制仍缺乏系统性研究。本研究系统阐明了铝电极箔在615~655℃烧结温度区间内的微观结构演化规律及电化学性能响应机制。采用3~4μm铝粉构筑梯度烧结体系,结合场发射扫描电镜(FE-SEM)、BET比表面积分析和电化学测试技术,研究发现:(1)烧结颈生长遵循体积扩散动力学,其平均长度与温度呈显著正相关,但其分布均匀性却随温度升高而变差;(2)比表面积随温度升高呈减小趋势,且与孔隙通道闭塞程度直接相关;(3)在625℃下烧结的样品具有最优综合性能:耐压值达574 V,比电容突破1.002μF/cm^(2),介质击穿概率低。微观机制分析表明,中温区(615~635℃)形成的适度烧结颈(1216~1640 nm)能维持孔径梯度分布,而高温区(645~655℃)引发的局部过熔导致孔隙率明显下降。综上所述,本研究揭示了单因素烧结温度对电极箔性能的影响规律,根据铝粉粒径合理选择烧结温度能够制备性能更好的粉末积层型电极箔。
Compared to traditional etched foils,powder-layered electrode foils show superior performance metrics along with an environmentally friendy fabrication process.Although considerable research has been devoted to their preparation methodologies,the temperature-dependent microstructural evolution during sintering remains insufficiently explored.This work systematically investigates how sintering temperature(615-655℃)governs the microstructure and electrochemical properties of the powder-architected aluminum electrode foils fabricated using 3-4μm aluminum particles.Three pivotal findings were revealed as follows:First,sintering neck evolution follows volume diffusion kinetics with pronounced temperature dependence,leading to deteriorated structural uniformity at elevated temperatures.Second,an exponential decrease in specific surface area occurs due to progressive pore channel occlusion.Third,the optimal sintering temperature of 625℃yields a breakdown voltage of 574 V(+18.3%enhancement),a specific capacitance of 1.002μF/cm^(2),and reduced dielectric breakdown probability.Microstructural analysis demonstrates that moderate sintering necks(1216-1640 nm)within the 615-635℃temperature range preserve graded pore distribution,whereas excessively high temperatures induce significant porosity reduction caused by localized melting.The established ternary correlation among sintering temperature,microstructure,and performance provides fundamental guidelines for precision manufacturing of high-performance dielectric foils.This study conclusively demonstrates the critical role of sintering temperature in electrode foil engineering,highlighting that sintering temperature must be tailored according to the aluminum powder particle size in developing advanced powderlayered electrode systems.
作者
李合克
贾俊仁
董行
游彭飞
董晓红
LI Heke;JIA Junren;DONG Hang;YOU Pengfei;DONG Xiaohong(School of Menchanial Engineering,Xinjiang University,Urumqi 830046,China;Xinjiang Joinworld Company Limited,Urumqi 830000,China;College of Mechanical and Electrical Engineering,Xinjiang Institute of Engineering,Urumqi 830023,China)
出处
《电子元件与材料》
北大核心
2025年第9期1034-1041,共8页
Electronic Components And Materials
基金
国家重点研发计划(2024YFB3411500)
新疆维吾尔自治区重点研发计划(2023B01016)
新疆维吾尔自治区中央引导地方科技发展资金(ZYYD2023A07)。
关键词
电极箔
铝粉烧结
烧结温度
比表面积
比电容
electrode foils
aluminum powder sintering
sintering temperature
specific surface area
specific capacitance
