赝电容器用纳米多孔电极的制备与性能优化  

Preparation and optimization of nanoporous electrode for pseudocapacitor

作　　者：乔志军 李宏伟 于镇洋[1] 赵潭 QIAO Zhi-jun;LI Hong-wei;YU Zhen-yang;ZHAO Tan(School of Mechanical Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学机械工程学院,天津300387

出　　处：《天津工业大学学报》2020年第4期47-52,共6页Journal of Tiangong University

基　　金：天津市自然科学基金资助项目(16JCYBJC41700);天津市教委科研计划项目(2017KJ075)。

摘　　要：为了获得导电性能好、氧化物与基底有效结合的高比容量电容器电极材料,采用去合金化法制备纳米多孔NiCoMn金属电极,经极化处理,在表面原位合成金属氧化物,有效提高赝电容器储能特性,其中母合金的轧制工艺和电极整体厚度是影响电极电化学性能的关键因素。本实验控制下轧量为30%、40%、50%和60%,对合金的微观结构和电化学性能进行表征。结果表明:当下轧量为30%时,其晶粒较小且因应力引起的微裂纹较少,体积比容量可达到606 F/cm^3(电流密度1 A/cm^3),表现出优异的电化学性能;实验中优选下轧量为30%,得到厚度分别为50、60、70和80μm的合金箔,制备的电极材料的电化学性能差别较明显。其中厚度为60μm的电极表现出最高的容量为671 F/cm^3。即使电流密度由1 A/cm^3增加至10 A/cm^3时,仍能保持470 F/cm^3的容量,展现出优良的倍率性能。实验结果表明,高比容量电极材料制备工艺的最佳参数是30%下轧量和60μm材料厚度。Self-growing oxy-hydroxide on nanoporous NiCoMn by dealloying and polarizing can enhance energy storage performance in the application of pseudocapacitor,but still is limited to the rolling capacity of NiCoMn alloy and the thickness of electrode.Herein,we explored the changes of micro-structure through controlling the rolling capacity as 30%,40%,50%and 60%,respectively.The results show that the rolling capacity of 30%can induce mild micro-cracks,thus leading to a high volumetric capacitance of 606 F/cm^3 at 1 A/cm^3.Meanwhile,the electrodes with thicknesses of 50,60,70 and 80μm at the same rolling capacity of 30%exhibit differential performance.The electrode with thickness of 60μm produces a high volumetric capacitance of 671 F/cm^3 at 1 A/cm^3 and a high rate capability,even increasing the current density from 1 A/cm^3 to 10 A/cm^3(470 F/cm^3).Hence the rolling capacity as 30%and electrode thickness of 60μm is the best parameters for preparing electrode materials.

关 键 词：去合金化 赝电容器 纳米多孔电极 微结构 下轧量 

分 类 号：TQ152[化学工程—电化学工业] TM914[电气工程—电力电子与电力传动]