电解质设计使稳定和能量密度高的离子电池成为可能
Zhe Zhang1, Xiaofang Wang2, Jiacheng Zhu3
1School of Chemistry, Beihang University, 100191, Beijing, P.R. China.
Angewandte Chemie (International ed. in English)
|October 10, 2024
概括
这项研究引入了一种用于离子电池 (PIB) 的新型电解质,使得石墨阳极和K2Mn[Fe(CN) 6阴极具有高性能. 新的电解质为离子电池 (LIB) 提供了一个可持续的,低成本的替代品.
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:
- 离子电池 (PIB) 正在被探索为可持续的,低成本的替代品,以离子电池 (LIB),由于缺乏关键元素,如和.
- 目前的PIBs存在低于最佳的电化学性能,特别是对于能有效支持低压阳极和高压阴极的电解质.
- 缺乏具有高库伦比效率 (CE) 和循环稳定的合适电解质,阻碍了PIB的实际应用.
研究的目的:
- 开发一种用于离子电池 (PIB) 的新型电解质,克服现有系统的局限性.
- 为了证明电解质能够支持低压阳极和高压阴极的高效率和稳定性.
- 为了评估使用新电解质用于实际储能应用的全 PIB 电池的性能.
主要方法:
- 为PIBs开发和描述一种新的电解质配方.
- 使用商业石墨阳极对电解质进行电化学测试,重点是初始和循环库伦比效率 (CE).
- 组装和测试一个K2Mn[Fe(CN) [6] (KMF) 阴极所带的石墨烯阳极全电池,以评估性能指标,如放电电压,特定能量和长期循环稳定性.
主要成果:
- 开发的电解质使得石墨阳极能够达到91.14%的初始CE和99.94%的平均循环CE,容量消失是可以忽略不计的.
- 电解质与在4.4V (相对于K+/K) 工作的高压K2Mn[Fe(CN) [6] (KMF) 阴极具有很好的兼容性.
- 该KMF玉石完整电池的平均放电电压为3.61V,特定能量为316.5Wh/kg,并在2000个循环后保持71.01%的容量.
结论:
- 这种新型电解质显著提高了离子电池 (PIB) 的电化学性能,解决了CE和循环稳定的关键挑战.
- 开发的电解质促进了高性能PIB,为当前的离子电池 (LIB) 技术提供了一个有希望的,具有成本效益的和可持续的替代方案.
- 该KMF水晶石完整电池展示了实际应用的潜力,实现了与LIBs相美的能量密度和优异的长期耐用性.
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