同时结晶机制导致LAGP玻璃陶电解质的低温透
Marc Bertrand1, Steeve Rousselot1, Maxime Rioux1
1Département de Chimie/Institut Courtois, Université de Montréal, 1375 Avenue Thérèse-Lavoie-Roux, Montréal H2V 0B3, QC, Canada.
ACS applied materials & interfaces
|May 17, 2024
概括
本研究探讨了用于固态电池的Li1.5Al0.5Ge1.5(PO4)3玻璃结晶. 它在较低的烧结温度下实现了高导电性和密度,降低了材料的反应性.
科学领域:
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
- 电化学 电化学 电化学
背景情况:
- 化陶电解质 (CE) 对密集的固态电池至关重要,但高温会导致有害的反应性.
- 晶体陶提供高导电性,而玻璃相材料为更密集的CE提供更好的热力学性能.
- 纳西康类型的电解质,如Li1.5Al0.5Ge1.5(PO4) 3 (LAGP),对玻璃相CE.有希望.
研究的目的:
- 研究LAGP玻璃在结晶后的可塑性,密度和导电性质.
- 了解结晶机制,以在降低烧结温度下实现高导电性和密度.
- 分析结晶动力学对陶电解质整体性能的影响.
主要方法:
- 不同扫描热度计和X射线衍射研究结晶机制和动力学.
- 密度测量用于量化结晶过程中的玻璃流量.
- 离子导电性测量与晶相演变相关联.
主要成果:
- 在30°C达到6.3 × 10^-5 S·cm^-1的高离子导电性,相对密度为92%.
- 烧结温度降至550°C,大约比LAGP的正常温度低200°C,没有施加压力.
- 确定了一种自催化核化效应,驱动了早期结晶路径.
结论:
- 在较低温度下结晶后,LAGP玻璃提供了出色的可塑性和密度.
- 发现的结晶机制使密集,高导电性陶电解质的高效生产成为可能.
- 这种方法减轻了反应性问题,为改善固态电池性能铺平了道路.
相关概念视频
Recrystallization: Solid–Solution Equilibria
1.1K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.1K
Precipitation Processes
446
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
446
Types of Coprecipitation
607
Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
607
Crystal Growth: Principles of Crystallization
1.8K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
1.8K
Colloidal precipitates
565
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
565
Washing, Drying, and Ignition of Precipitates
908
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
908


