不易燃电解质与微弱性稀释剂用于稳定基于的离子电池
Rui Qiao1, Guangling Li1, Chenyu Liang2
1State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, Xi'an Jiaotong University, Xi'an, 710049, China.
Small (Weinheim an der Bergstrasse, Germany)
|December 18, 2024
概括
研究人员开发了一种用于离子电池中的阳极的新电解质. 这种新型稀释剂提高了稳定性和性能,改善了电池寿命,并使高能量密度应用成为可能.
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:
- 稳定基于的阳极对于先进的离子电池至关重要.
- 当前的电解质工程往往忽视了阳极的专门稀释剂.
- 局部高度电解质显示有前途,但需要进一步优化.
研究的目的:
- 为改进的基于的阳极设计一种新型,不可燃电解质.
- 研究一种弱性稀释剂在稳定固体电解质间相 (SEI) 中的作用.
- 为了提高阳极离子电池的循环稳定性和能量密度.
主要方法:
- 加入甲基 perfluorobutyl 以太作为一个微弱的性稀释剂.
- 使用二 ((fluorosulfonyl) 胺和1,2-dimethoxyethane的电解质的配方.
- 基于的阳极与富含的阴极的电化学测试.
主要成果:
- 稀释剂促进了溶解中的大型集群状结构的形成.
- 加快了离子运输和增加了阳极表面的离子协调.
- 形成一个强大的,有机不丰富的固体电解质介相 (SEI).
- 在200个循环后实现了高面积容量 (4.2 mAh cm-2) 和82.1%的容量保留.
结论:
- 开发的电解质显著提高了基于的阳极的稳定性和性能.
- 弱性稀释剂在调整SEI特性以提高电池寿命方面是有效的.
- 这种电解质配方对高能量密度的离子电池具有前景.
相关概念视频
01:19Acid Halides to Alcohols: LiAlH4 Reduction
2.7K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.7K
02:48Ionic 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
03:12Batteries and Fuel Cells
27.0K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
27.0K
02:21Electrolyte and Nonelectrolyte Solutions
62.2K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
62.2K