Simulation and optimization of electrochemical double layer capacitors: effects of ion size and diffusion coefficient

LU Haotian; CHEN Yiqin; ZHOU Jinghong; SUI Zhijun; ZHOU Xinggui

doi:10.11949/0438-1157.20190421

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Simulation and optimization of electrochemical double layer capacitors: effects of ion size and diffusion coefficient

Energy and environmental engineering | 更新时间：2026-07-24

- Simulation and optimization of electrochemical double layer capacitors: effects of ion size and diffusion coefficient
- CIESC Journal Vol. 70, Issue 10, Pages: 4021-4031(2019)
- 作者机构：
  
  华东理工大学化学工程联合国家重点实验室，上海 200237
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190421
  CLC： TQ 152
- Received：23 April 2019，
  
  Revised：2019-06-11，
  
  Online First：24 July 2026，
  
  Published：05 October 2019
- 稿件说明：
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鲁浩天, 陈怡沁, 周静红, 隋志军, 周兴贵. 电化学双电层电容器动态模拟：离子尺寸及扩散系数的优化[J]. 化工学报, 2019, 70(10): 4021-4031

LU Haotian, CHEN Yiqin, ZHOU Jinghong, SUI Zhijun, ZHOU Xinggui. Simulation and optimization of electrochemical double layer capacitors: effects of ion size and diffusion coefficient[J]. CIESC Journal, 2019, 70(10): 4021-4031
鲁浩天, 陈怡沁, 周静红, 隋志军, 周兴贵. 电化学双电层电容器动态模拟：离子尺寸及扩散系数的优化[J]. 化工学报, 2019, 70(10): 4021-4031 DOI： 10.11949/0438-1157.20190421.

LU Haotian, CHEN Yiqin, ZHOU Jinghong, SUI Zhijun, ZHOU Xinggui. Simulation and optimization of electrochemical double layer capacitors: effects of ion size and diffusion coefficient[J]. CIESC Journal, 2019, 70(10): 4021-4031 DOI： 10.11949/0438-1157.20190421.

摘要

电化学双电层电容器的低能量密度限制了其在储能动力等领域的应用，而有机电解液作为提升器件能量密度的关键因素，研究其导电电解质的特性具有重要的意义。通过构建电化学双电层电容器的动态模型，模拟了电化学双电层电容器的循环伏安曲线，并定量探究和解析了离子溶剂化尺寸和扩散系数对电容性能的影响。模拟结果表明：在低扫描速率情况下，电容性能主要受控于双电层结构特性，比电容随着离子溶剂化尺寸的减小而增大，而离子扩散系数对其电容性能没有影响；在高扫描速率情况下，电容性能会受控于离子传质过程，比电容随着离子溶剂化尺寸和离子扩散系数的增大而增大。并基于模拟计算和分析结果提出了理性设计和优化电化学双电层电容器的策略。

Abstract

The low energy density of electrochemical double layer capacitors limits its application in the field of energy storage power. Organic electrolytes

as a key factor in improving the energy density of devices

are of great significance in studying the properties of conductive electrolytes. Ion size and diffusion coefficient in organic electrolyte are the critical factors in determining the energy density of electrochemical double layer capacitors. A dynamic model of electrochemical double layer capacitors was established to simultaneously account for transport process

Stern and diffuse layers and the saturation phenomenon of dielectric permittivity. The cyclic voltammetry measurement of electrochemical double layer capacitors was numerically simulated for different ionic solvation sizes and diffusion coefficients. The simulation results indicated that the specific capacitances were only affected by ionic solvation sizes at low scan rates

increasing significantly with decreasing ionic solvation size

whereas the ionic diffusion coefficients had no effect on the specific capacitances which were mainly controlled by the Stern layer at low scan rates. However

the specific capacitances

which were mainly controlled by the ionic transport within the diffuse layer at high scan rates

were simultaneously affected by ionic solvation sizes and diffusion coefficients. The specific capacitances increased considerably with increasing ionic solvation size or diffusion coefficient at high scan rates. Finally

the strategies for rational design of electrochemical double layer capacitors is proposed based on the simulation results.

关键词

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references

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