表面分子工程使硫化物固体电解质在潮湿的环境空气中进行处理
Mengchen Liu1, Jessica J Hong1, Elias Sebti2,3
1Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California San Diego, La Jolla, USA.
Nature communications
|January 2, 2025
概括
硫化物固态电解质 (SSEs) 对水分敏感,阻碍了电池制造. 一种使用1-undecanethiol的新表面修改允许在潮湿的空气中进行处理,保护SSE并使全固态电池的开发成为可能.
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
- 化学工程是化学工程的重要组成部分.
背景情况:
- 硫化物固态电解质 (SSEs) 为所有固态电池 (ASSB) 提供高离子导电性和柔性.
- 由于SSE对水分的敏感性,需要控制环境,这使制造复杂化并增加成本.
- 现有的保护方法往往会损害电解质性能或与工业工艺不兼容.
研究的目的:
- 为硫化物SSEs开发一种耐湿性表面修饰,使环境空气处理成为可能.
- 调查SSE表面上长链基醇的化学兼容性和保护机制.
- 为了证明修改后的SSEs在功能ASSB中的实际应用.
主要方法:
- 表面修改的Li6PS5Cl SSE与1-undecanethiol.使用的一次.
- 长时间暴露在33%相对湿度 (RH) 的空气中.
- 电化学阻抗光谱法用于测量离子导电.
- 射线衍射 (XRD) 和分析结构完整性的其他技术.
- 使用修改后的SSEs制造和测试ASSB.
主要成果:
- 1-undecanethiol在Li6PS5Cl上形成了一个稳定的保护层,排斥水分.
- 修改后的SSEs在33%的RH空气中保持电导率>1mS cm-1长达2天,保护时间>100倍.
- 观察到对离子导电性的影响微不足道.
- 经过修改后的SSE在暴露于湿度后,在Li0.5IngadgadgadLiNi0.8Co0.1Mn0.1O2ASSB中保持了功能.
- 计算和实验数据证实了醇组的定和疏水性保护.
结论:
- 用基醇进行可逆表面修饰,使得在环境条件下可以实用,经济高效地制造硫化物SSE.
- 这一战略显著提高了SSE对湿度的稳定性,克服了ASSB商业化的主要障碍.
- 这种方法为可扩展生产高性能全固态电池铺平了道路.
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