摘要
为了提升锂离子电池和超级电容器性能,探索含锂型低共熔溶剂(deep eutectic solvents,DESs)与常规溶剂体系的电化学稳定性,本文通过三电极循环伏安法研究了溶剂类型、摩尔分数和截止电流密度对含锂型DESs硝酸锂:N–甲基乙酰胺(N-methylacetamide,NMA)体系的影响。特别是在含锂型DESs硝酸锂:NMA+水(H2O)和+乙酸乙酯(ethyl acetate,EAC)体系中,截止电流密度±1~±5 mA/cm2时,电化学窗口数值分别改变1.177和1.980 V vs Ag/AgCl;摩尔分数在0%~90%区间变化时,电化学窗口数值分别改变2.893和2.001 V vs Ag/AgCl。结果表明,溶剂摩尔分数对阴极极限电位、阳极极限电位和电化学窗口的影响显著高于截止电流密度的影响;此外,溶剂摩尔分数、截止电流密度和溶剂类型均对本文研究的3个体系的电化学稳定性产生了显著影响。本文分析可为锂离子电池和超级电容器的设计提供重要的参考依据。
In order to enhance the performance of lithium-ion batteries and supercapacitors,it is essential to explore the electrochemical stability of lithium-containing deep eutectic solvents(DESs)in conjunction with conventional solvent systems.This study investigated the effects of solvent type,mole fraction,and cutoff current density on the electrochemical behavior of lithium-containing DESs with a lithium nitrate:N-methylacetamide(NMA)system using a three-electrode cyclic voltammetry method.Specifically,in the systems of lithium-containing DESs with lithium nitrate:NMA+water(H2O)and that+ethyl acetate(EAC),when the cutoff current density varied in the range of±1~±5 Ma/cm2,the electrochemical window values were changed by 1.177 and 1.980 V vs Ag/AgCl,respectively.Furthermore,when the mole fraction varied from 0%to 90%,the electrochemical window values were changed by 2.893 and 2.001 V vs Ag/AgCl,respectively.The results indicate that the solvent mole fraction has a significantly greater impact on the cathodic limit potential,anodic limit potential,and electrochemical window than the cutoff current density.Additionally,the solvent mole fraction,cutoff current density,and solvent type all significantly influence the electrochemical stability of the three systems studied in this paper.The analysis provided in this study offers important references for the design of lithium-ion batteries and supercapacitors.
作者
陈钰
赵国健
田雨润
牟天成
CHEN Yu;ZHAO Guojian;TIAN Yurun;MU Tiancheng(Department of Chemistry and Materials Science,Langfang Normal University,Langfang 065000,China;School of Chemistry and Life Resources,Renmin University of China,Beijing 100872,China)
出处
《应用科技》
2025年第1期91-97,共7页
Applied Science and Technology
基金
国家自然科学基金面上项目(22073112)
国家自然科学基金青年项目(22103030)
河北省自然科学基金面上项目(B2024408022).
关键词
低共熔溶剂
电解
分解
锂离子电池
电化学窗口
超级电容器
电解质
极限电位
deep eutectic solvents
electrolysis
decomposition
lithium-ion batteries
electrochemical window
supercapacitor
electrolyte
limiting potential
