Groda Yaroslav, Dudka Maxym, Oshanin Gleb, Kornyshev Alexei A, Kondrat Svyatoslav
Department of Mechanics and Engineering, Belarusian State Technological University, Sverdlova str., 13a, 220006 Minsk, Belarus.
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii st., 79011 Lviv, Ukraine.
J Phys Condens Matter. 2022 May 2;34(26). doi: 10.1088/1361-648X/ac6307.
Analytical models for capacitive energy storage in nanopores attract growing interest as they can provide in-depth analytical insights into charging mechanisms. So far, such approaches have been limited to models with nearest-neighbor interactions. This assumption is seemingly justified due to a strong screening of inter-ionic interactions in narrow conducting pores. However, how important is the extent of these interactions? Does it affect the energy storage and phase behavior of confined ionic liquids? Herein, we address these questions using a two-dimensional lattice model with next-nearest and further neighbor interactions developed to describe ionic liquids in conducting slit confinements. With simulations and analytical calculations, we find that next-nearest interactions enhance capacitance and stored energy densities and may considerably affect the phase behavior. In particular, in some range of voltages, we reveal the emergence of large-scale mesophases that have not been reported before but may play an important role in energy storage.
纳米孔中电容式能量存储的分析模型正吸引着越来越多的关注，因为它们能够深入剖析充电机制。到目前为止，此类方法仅限于具有最近邻相互作用的模型。由于在狭窄的导电孔中离子间相互作用的强烈屏蔽，这一假设看似合理。然而，这些相互作用的程度有多重要？它是否会影响受限离子液体的能量存储和相行为？在此，我们使用一个二维晶格模型来解决这些问题，该模型包含次近邻及更远邻相互作用，用于描述导电狭缝限制中的离子液体。通过模拟和解析计算，我们发现次近邻相互作用会增强电容和存储的能量密度，并可能对相行为产生显著影响。特别是在某些电压范围内，我们揭示了此前未被报道过的大规模中间相的出现，而这些中间相可能在能量存储中发挥重要作用。
