具有核心外溶解结构的高溶解电解质,用于精益电解质硫电池
Mengxue He1, Lujun Zhu1, Yatao Liu1
1Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
Angewandte Chemie (International ed. in English)
|November 11, 2024
概括
这项研究引入了硫电池的新型电解质,提高了硫的利用率和稳定性,用于高能量密度的应用.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 硫电池具有较高的理论能量密度,但面临着低硫利用率和电解质不稳定性的挑战.
- 现有的高溶解电解质 (HSEs) 在硫氧化还原反应和金属阳极的长期稳定性方面扎.
- 解决这些局限性对于推进实际的硫电池技术至关重要.
研究的目的:
- 开发一种新的核心外溶解结构化的HSE,以提高硫电池性能.
- 为了提高硫的利用和稳定性在稀缺的电解质条件下.
- 为了使金属阳极与硫阴极一起稳定循环.
主要方法:
- 使用以太基溶剂和色胺辅溶剂,制备一种独特的核心溶解结构的HSE.
- 研究电解质的溶解结构及其对基质中间体和阳极稳定性的影响.
- 对具有高硫负载和低电解质与硫比率的硫电池进行电化学测试.
主要成果:
- 核心外结构有效地限制了辅溶剂,防止与金属阳极的有害反应.
- 实现了[S3]•−基中间体的长时间稳定性,促进了基于溶液的快速硫氧化还原反应.
- 在硫载荷为5.5毫克的硫 cm-2和E/S比为4μL的硫 mg-1.1时,达到864mAh的高容量.
- 证明了2.71-A h袋式电池的稳定循环,其特定能量为307Wh kg-1.1.
结论:
- 调整电解质溶解结构是同时改善硫氧化还原反应和金属阳极稳定的基本策略.
- 开发的核心外结构的HSE为高能量密度硫电池提供了一个有前途的途径.
- 这项工作为控制金属硫电池性能的合电极-电解质化学提供了关键的见解.
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