通过在弱溶解电解质中通过离子双极相互作用接近快速离子运输,可以实现稳定的Li-plating化学
Min Niu1, Liwei Dong1, Xingyu Chen1
1State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
National science review
|March 25, 2025
概括
这项研究引入了用于石墨/金属混合阳极的新型电解质,提高了电池的稳定性和能量密度. 新设计改善了离子传输和沉积,这对于下一代金属离子电池至关重要.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 石墨/金属混合阳极提供高能量密度,但面临着溶剂协同插入和接口不稳定等挑战.
- 弱溶解的电解质改善了溶解,但受到缓慢的离子运输的影响,导致高过电位和树突形成.
研究的目的:
- 为石墨/金属混合阳极开发先进的电解质,克服当前系统的局限性.
- 通过改进的电解质设计,提高金属离子电池的循环稳定性和能量密度.
主要方法:
- 利用甲基酸盐作为一个弱协调的辅溶剂来设计电解质溶解.
- 研究了离子-溶剂相互作用以削弱Li+-离子相互作用并促进离子运输.
- 在循环条件下测量了离子导电性和评估了电池性能.
主要成果:
- 在25°C的新型弱溶解电解质中达到17.74mS cm-1的高离子导电性.
- 在混合阳极上证明了缓解的度极化和均的沉积.
- 在4C下1500个循环中达到99.8%的平均库伦比效率,并且在0.5.5的低N/P比率下提高了循环稳定性.
结论:
- 用甲基酸盐设计的电解质可促进离子运输和在石墨/金属混合阳极中的均沉积.
- 在电解质工程中的这一突破显著提高了金属离子电池的循环稳定性和性能.
更多相关视频
07:38Functional Characterization of Na+/H+ Exchangers of Intracellular Compartments Using Proton-killing Selection to Express Them at the Plasma Membrane
Published on: March 30, 2015
9.2K
10:41Three-electrode Coin Cell Preparation and Electrodeposition Analytics for Lithium-ion Batteries
Published on: May 22, 2018
36.5K
相关概念视频
Aqueous Solutions and Heats of Hydration
14.2K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.2K
Ion Exchange
517
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
517
Ionic Bonding and Electron Transfer
40.1K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
40.1K
Intermolecular Forces
56.5K
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...
56.5K
Ionic Strength: Effects on Chemical Equilibria
1.3K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.3K
Ionic Bonds
117.5K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
117.5K
