硫化聚烯二阴极在硫电池中的可逆固体-固体转换,通过微弱溶解以太电解质
Tao Ma1,2, Youxuan Ni1,2, Diantao Li1,2
1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China.
Angewandte Chemie (International ed. in English)
|September 5, 2023
概括
研究人员开发了一种用于硫化聚烯 (Li-SPAN) 电池的新型稀释电解质. 这种电解质通过防止聚硫化物穿并改善金属阳极兼容性,使其在广泛的温度下稳定运行.
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:
- 硫化聚烯 (Li-SPAN) 电池面临着与传统电解质的挑战.
- 碳酸盐电解质与金属阳极不相容,而以太电解质则受到穿效应和容量衰减的影响.
研究的目的:
- 为了定制一种与SPAN阴极和金属阳极兼容的稀释电解质.
- 为了提高Li-SPAN全细胞的电化学性能和稳定性.
主要方法:
- 开发一种稀释以太电解质,具有较低的溶解功率.
- 研究SPAN阴极中的"固体-固体"转换机制.
- 对正极电解质间相 (CEI) 形成和聚硫化物阻断的分析.
- 评估沉积/剥离动力学和在不同温度下全细胞性能.
主要成果:
- 量身定制的电解质使SPAN的可逆"固体-固体"转换成为可能.
- 形成了一个强大的CEI,有效地抑制了聚硫化物溶解和穿效应.
- 快速的离子动力学和高度可逆的沉积/脱落在25°C至-40°C之间实现.
- 具有高负载SPAN阴极的Li-SPAN全电池在广泛的温度范围内表现出稳定的运行.
- 一个Li-SPAN袋式电池在稀缺的电解质条件下稳定运行了一个多月.
结论:
- 开发的低溶解电解质克服了Li-SPAN电池技术的关键局限性.
- 这种电解质设计促进了Li-SPAN系统中稳定和高效的能量储存.
- 这些发现为实际的,温度范围广泛的Li-SPAN电池应用铺平了道路.
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