在电子对捐赠溶剂中含硫的LLZO石榴电解质的表面化学
Abhinandan Shyamsunder1, Max Palmer2, Ivan R Kochetkov1
1Department of Chemistry and Waterloo Institute of Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada.
ACS applied materials & interfaces
|October 31, 2023
概括
用电子对捐赠溶剂保护硫电池需要稳定的接口. 酸盐装饰的石榴石固体电解质防止电阻层的形成,使得高硫利用率和稳定的循环.
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:
- 传统的硫 (Li-S) 电池使用液体电解质 (例如,LiNO3 / DOL / DME) 具有有限的阳极接口稳定性.
- 电子对捐赠剂 (EPD) 溶剂增强了多硫化物可溶性和硫利用在瘦电解质Li-S细胞中.
- 由于EPD溶剂的还原不稳定性,需要具有稳定的离子导电膜,既具有和硫的物种,如石榴 LLZO.
研究的目的:
- 为了研究石榴 LLZO 和 Li-S 电池中的 EPD 溶剂之间的界面反应.
- 开发LLZO的保护表面修改,以提高其与EPD溶剂和硫的稳定性.
- 为了评估混合液体-固体电解质电池与修改LLZO的性能.
主要方法:
- 暴露于EPD溶剂和溶解硫的LLZO表面分析.
- 电化学阻抗光谱 (EIS) 用于测量界面电阻.
- 混合液体-固体电解质Li-S电池的制造和电化学测试,用酸盐装饰的LLZO.
主要成果:
- 在LLZO表面上的微量LiOH与EPD溶剂 (DMA) 中溶解的硫反应,形成一个电阻阻层 (100010,000 Ω cm2).
- 酸组装饰LLZO显著降低电荷转移电阻到40 Ωcm2并防止电阻层的生长.
- 使用修改LLZO的混合电池实现了高硫利用率 (1400 mAh g-1,理论上85%) 和稳定的循环.
结论:
- 固体电解质的表面化学质量对于Li-S电池的EPD溶剂的稳定性至关重要.
- 酸盐表面修饰有效地保护石榴石电解质免受有害的界面反应.
- 这种方法使得高性能Li-S电池能够改善循环寿命和硫利用.
相关概念视频
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
Sample Preparation for Analysis: Advanced Techniques
378
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
378
Preparation and Reactions of Sulfides
4.9K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.9K
Ionic Bonding and Electron Transfer
41.6K
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.
41.6K
Extraction: Advanced Methods
463
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
463
Trends in Lattice Energy: Ion Size and Charge
23.9K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.9K


