以阳离子为媒介的方法来克服高压离子电池以太电解质中的氧化
Xingyu Wang1, Qi Fan1, Ziheng Liu1
1School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China.
Nature communications
|March 15, 2025
概括
研究人员开发了一种用于离子电池的新型电解质,可以防止高压氧化. 通过添加特定的离子,电解质的电解质.
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:
- 基于以太的电解质对于离子电池至关重要,因为它们的阳极兼容性和电化学性能.
- 一个关键的限制是它们在高工作电压下容易氧化,通常在3.9V以上.
- 这种分解与diglyme溶剂的核友性和富含电子的氧原子有关.
研究的目的:
- 为了提高以太基电解质的氧化稳定性,用于高压离子电池.
- 开发一项用于diglyme溶剂的被动化策略,以防止电解质分解.
- 为了使高压阴极材料在实际的离子电池系统中能够使用.
主要方法:
- 将外来离子 (NaF,NaNxOy) 纳入基于狄格的电解质中.
- 通过在高电压下进行电化学测试来研究电解质稳定性.
- 分析阴极电解质间相 (CEI) 的形成和组成.
主要成果:
- 修改后的电解质具有增强的氧化阻力,稳定高达4.8V (vs. Na+/Na).
- 用NaF和NaNxOy丰富的CEI保护层的形成使溶剂上的反应部位被动化.
- 改进的电解质与硬碳和石墨阳极兼容,并在袋式电池中起作用.
结论:
- 结合外来离子的策略有效地抑制了电解质脱和氧化.
- 这种方法显著扩大了以太基电解质的电化学稳定性窗口.
- 这些发现为开发使用高压阴极的实用,高能量密度的离子电池铺平了道路.
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