Ion Structure Transition Enhances Charging Dynamics in Subnanometer Pores
Ion Structure Transition Enhances Charging Dynamics in Subnanometer Pores
复制标题
离子结构转变增强亚纳米孔中的充电动力学
DOI：
10.1021/acsnano.9b09648
复制
发表时间：
2020
期刊：
影响因子：
17.1
通讯作者：
Guang Feng
中科院分区：
文献类型：
--
作者：
Tangming Mo;Sheng Bi;Yuan Zhang;Volker Presser;Xuehang Wang;Yury Gogotsi;Guang Feng
使用亚纳米孔电极和离子液体电解质可以在牺牲充电速率的情况下提高电荷存储容量。对纳米多孔电极的充电动力学的基本理解可以帮助避免损害功率密度。在这项工作中，我们进行了分子动力学模拟，以揭示离子液体中的亚纳米孔的充电机制。与传统的孔隙越小充电速度越慢的观点不同，发现充电速度与孔隙尺寸之间存在非单调关系，在某些亚纳米孔隙中充电速度加快。我们的分析揭示了充电增强的机制可以归因于在孔内离子结构的转变。
Using electrodes with subnanometer pores and ionic liquid electrolytes can improve the charge storage capacity at the expense of the charging rate. The fundamental understanding of the charging dynamics of nanoporous electrodes can help to avoid compromising the power density. In this work, we performed molecular dynamics simulations to reveal the charging mechanism of subnanometer pores in ionic liquids. Different from the traditional view that a smaller pore results in slower charging, a non-monotonic relation is found between the charging rate and pore size, in which the charging process is accelerated in some subnanometer pores. Our analysis uncovers that the mechanism of the charging enhancement can be attributed to the transition of in-pore ion structure.