了解二碳酸中的离子运输:一种实验和计算研究
Samuel Emilsson1, Marcelo Albuquerque2,3, Pernilla Öberg1
1Department of Fibre and Polymer Technology, Division of Coating Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
ACS physical chemistry Au
|January 27, 2025
概括
二碳酸盐提高了液体电解质的安全性和稳定性. 它们的末端组显著影响离子运输,在离子周围的溶剂交换有限,提高了电池性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
背景情况:
- 液体电解质对电池至关重要,但面临着安全性和稳定性的挑战.
- 二碳酸盐比传统的线性碳酸盐 (如二甲基碳酸盐 (DMC) 和二甲基碳酸盐 (DEC)) 有潜在的改进.
研究的目的:
- 研究二碳酸盐结构对物理和离子运输特性的影响.
- 为了比较二碳酸盐电解质与线性碳酸盐 (DMC,DEC) 的电池应用.
主要方法:
- 用分子动力学模拟来分析溶解结构和离子运输.
- 通过计算建模了四个二碳酸盐结构,具有多种末端组和间隔器.
主要成果:
- 二碳酸盐末端组显著影响离子运输特性.
- 二碳酸电解质与线性碳酸盐相比,具有更高的离子协调数.
- 在二碳酸盐系统中,在离子周围观察到有限的溶剂交换,协调受限.
结论:
- 二碳酸盐为更安全,更稳定的液体电解质提供了一个有希望的替代品.
- 二碳酸盐的结构设计,特别是末端组,是优化离子运输的关键.
- 在二碳酸盐中,+运输的特点是与溶剂分子和离子进行协调运动.
相关概念视频
01:33Carboxylic Acids to Methylesters: Alkylation using Diazomethane
2.1K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.1K
02:10Carbocations
10.9K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
10.9K
03:38Polyprotic Acids
28.9K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
28.9K
01:14Alkylation of β-Diester Enolates: Malonic Ester Synthesis
3.3K
Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
3.3K
01:17Pore Transport and Ion-Pair Transport
342
Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
342
01:17Factors Affecting Activity Coefficient
722
The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size.
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a...
722