用于在低温和高压下运行的固态金属电池的化弹性电解质的设计
Jinseok Park1, Hyeonseok Seong1, Chanho Yuk2
1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
Advanced materials (Deerfield Beach, Fla.)
|May 7, 2024
概括
这项研究引入了一种新的化塑料晶体嵌入式弹性电解质 (F-PCEE) 用于低温固态金属电池 (LMB). F-PCEE能够在-10°C和-20°C下稳定地运行电池,显示出出色的循环性能和耐用性.
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
- 聚合物科学 聚合物科学
背景情况:
- 固态金属电池 (LMB) 是下一代能源存储的前景.
- 低温性能仍然是当前LMB电解质的重大挑战.
- 开发强大的电解质对于安全高效的LMB运行至关重要.
研究的目的:
- 开发一种新的弹性体电解质,用于固态LMB的低温操作.
- 研究电解质结构与低温电化学性能之间的关系.
- 为了证明新电解质在高压LMB应用中的潜力.
主要方法:
- 通过聚合诱导的相分离合成化塑料结晶嵌入式弹性电解质 (F-PCEE).
- 在低温下F-PCEE的机械性能 (应变) 和离子导电性的表征.
- 使用F-PCEE在各种温度和高电压下制造和电化学测试Li/LiNi0.8Co0.1Mn0.1O2全电池.
主要成果:
- 在F-PCEE表现出高的机械应变 (≈300%) 和离子导电性 (≈0.23 mS cm-1) 在-10°C.
- 全电池显示在-10°C (74.4%) 和-20°C (42.5%) 显著保留放电能力.
- 在 -10°C和4.5V的150个循环后,F-PCEE能够保持85.3%的容量,抑制树突的生长并形成富含LiF的介面相.
结论:
- F-PCEE的设计策略有效地提高了固态LMB的低温性能和循环稳定性.
- 电解质的独特相位分离和机械强度是其卓越性能的关键.
- 这项工作为开发高性能,低温固态LMB为苛刻的应用铺平了道路.
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