选择性化芳盐调节了全固态电池的溶解结构和界面化学
Shuaishuai Yan1, Hao Liu2, Yang Lu1
1State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
Science advances
|January 31, 2025
概括
新的化盐通过稳定接口和增强离子运输来改善固体聚合物电解质,使其更安全,更高性能的全固态金属电池.
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
- 聚合物化学 聚合物化学
背景情况:
- 固体聚合物电解质 (SPEs) 面临着聚合物主导的Li+溶解的挑战,导致不稳定的接口和电池性能差.
- 开发稳定的电解质/电极界面对于推进全固态金属电池 (ASLMB) 至关重要.
研究的目的:
- 设计新型选择性化芳香盐 (SFALS) 作为单导盐.
- 在ASLMBs中调节Li+溶解结构和界面化学.
- 提高ASLMB的性能和稳定性.
主要方法:
- 合成和表征了一类具有可调节离子结构的SFALS.
- 使用光谱和电化学方法研究了Li+溶解结构和离子运输机制.
- 使用基于SFALS的SPEs制造和测试ASLMB.
主要成果:
- SFALS削弱了Li+ - 聚乙烯的合,并增强了Li+ - 离子的协调.
- 结合诱导了"三元体"类型的溶解结构,改善了电解质的均性和机械强度.
- 促进了超薄,强大的富含Li2O的固体电解质介相 (SEI) 的形成.
- 在LiFePO4/Li半细胞中实现了超过1650个周期 (99.8%CE) 的稳定循环,在完整细胞中达到580个周期 (97.4%的保留).
结论:
- SFALS的分子工程提供了一种可行的策略,以克服SPE的局限性.
- 开发的SFALS显著提高ASLMB的界面稳定性和电化学性能.
- 这种方法为高性能ASLMB的实际应用铺平了道路.
更多相关视频
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
12.9K
10:58Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
Published on: March 7, 2018
10.1K
相关概念视频
Ionic Bonding and Electron Transfer
41.2K
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.
41.2K
Ionic Crystal Structures
14.1K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.1K
Solubility Equilibria: Overview
584
When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility is important in biological and environmental processes. A notable...
584
Molecular Shape and Polarity
59.6K
Dipole Moment of a Molecule
59.6K
Solvating Effects
7.3K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
7.3K
Intermolecular Forces
57.5K
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...
57.5K
