Methodological Studies of the Mechanism of Anion Insertion in Nanometer‐Sized Carbon Micropores
Methodological Studies of the Mechanism of Anion Insertion in Nanometer‐Sized Carbon Micropores
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纳米级碳微孔阴离子嵌入机理的方法学研究
DOI：
10.1002/cssc.202201847
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发表时间：
2022
期刊：
影响因子：
8.4
通讯作者：
Stadie, Nicholas P.
中科院分区：
文献类型：
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作者：
Welty, Connor;Taylor, Erin E.;Posey, Sadie;Vailati, Patric;Kravchyk, Kostiantyn V.;Kovalenko, Maksym V.;Stadie, Nicholas P.
双离子混合电容器（DIHC）是介于电池和超级电容器之间的一类有前途的电化学能量存储装置，具有高能量和功率密度，并且可在锂以外的广泛化学物质中推广。在本研究中，研究了具有仅包含1.2 nm宽孔的周期性结构的模型碳骨架材料，沸石模板碳（ZTC），其作为正电极用于储存与DIHC化学相关的一系列阴离子。 在3.0-4.0 V（相对于Li/Li+）的常见稳定电位窗口内对21种电解质组合物进行了筛选实验，以确定容量随阴离子和溶剂性质变化的趋势。 为了实现快速充电能力，使用了一种二元溶剂，以平衡高介电常数与低粘度和小分子尺寸;基于LiPF 6的优化全电池在二元电解质中分别表现出146 Wh kg− 1和>4000 W kg− 1的能量和功率密度。
Dual‐ion hybrid capacitors (DIHCs) are a promising class of electrochemical energy storage devices intermediate between batteries and supercapacitors, exhibiting both high energy and power density, and generalizable across wide chemistries beyond lithium. In this study, a model carbon framework material with a periodic structure containing exclusively 1.2 nm width pores, zeolite‐templated carbon (ZTC), was investigated as the positive electrode for the storage of a range of anions relevant to DIHC chemistries. Screening experiments were carried out across 21 electrolyte compositions within a common stable potential window of 3.0–4.0 V vs. Li/Li+to determine trends in capacity as a function of anion and solvent properties. To achieve fast rate capability, a binary solvent balancing a high dielectric constant with a low viscosity and small molecular size was used; optimized full‐cells based on LiPF6in binary electrolyte exhibited 146 Wh kg−1and >4000 W kg−1energy and power densities, respectively.