在极端条件下运行金属电池的量化界面描述
John Holoubek1, Kunpeng Yu1, Junlin Wu2
1Department of NanoEngineering, University of California San Diego, CA 92093.
概括
在电解质中优化离子配对是高性能金属电池 (LMB) 的关键. 轻微稀释,而不是最大配对,改善了LMBs的低温和快速充电能力.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 物理化学 物理化学
背景情况:
- 金属电池 (LMB) 需要先进的电解质,以满足快速充电和低温操作等要求高的应用.
- 离子 (Li+) 解溶动力学显著影响动力应变下的LMB性能.
- 目前的方法经常使用离子配对的定性控制,这可能不是最佳的.
研究的目的:
- 调查离子配对对Li+溶解和LMBs中的阳极可逆性的定量影响.
- 探索溶解化学和结构如何影响运动应变下的电解质性能.
- 开发电解质,使LMB在低温和高充/放电速率下能够稳定运行.
主要方法:
- 使用局部电解质,具有不同的以太溶剂结合强度 (强或弱).
- 采用实验和计算分析来研究溶解状态和电荷转移.
- 在动力应变下进行全细胞循环测试,包括低温和快速充电条件.
主要成果:
- 对+离子配对的定量控制比定性控制更为关键,以尽量减少溶解处罚.
- 最大离子配对对于超低温和高速率的LMB操作是不理想的;轻微的局部稀释增强了可逆性.
- 弱结合的溶剂,在它们的最佳离子配对度,始终产生优越的性能.
- 基于乙烯的电解质表现出稳定的循环到-60°C和20分钟快速充电.
结论:
- 对Li+溶解状态的明确和定量优化对于下一代LMB电解质至关重要.
- 定制离子配对和溶解结构使LMB能够在具有挑战性的动力条件下运行.
- 这项研究为强大的LMB铺平了道路,适合极端温度和快速充电场景.
更多相关视频
相关概念视频
Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
Solubility of Ionic Compounds
63.3K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
63.3K
Ionic Strength: Overview
1.5K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.5K
Interfacial Electrochemical Methods: Overview
280
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
280
Intermolecular Forces
58.6K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.6K
Electrolytes: van't Hoff Factor
33.2K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
33.2K


