低温和快速充电的金属电池通过溶剂-溶剂相互作用介导的电解质来实现
Akang Huang1,2, Zheng Ma1, Pushpendra Kumar3
1State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Nano letters
|June 10, 2024
概括
研究人员使用乙烯碳酸盐和1,2-二乙开发了一种用于金属电池的新电解质. 这一策略提高了低温性能和快速充电,使得在-30°C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:
- 金属电池提供高能量密度,但在低温性能和快速充电方面存在困难.
- 目前基于乙烯碳酸盐 (EC) 的电解质在极端条件下具有局限性.
研究的目的:
- 开发一种电解质配方,以提高金属电池的低温性能和快速充电能力.
- 研究电解质溶解化学,以提高离子的运输和稳定性.
主要方法:
- 设计了一种新的电解质,使用乙烯碳酸盐 (FEC) 和1,2-二二 (2FB) 作为稀释剂.
- 研究了电解质内的分子间相互作用,以了解它们对Li+溶解和结点的影响.
- 在低温和高充/放电率下评估了LiNi0.8Co0.1Mn0.1O2干燥Li电池的电化学性能.
主要成果:
- 新的电解质有效降低了电解质的结点,并促进了由于2FB的分子间相互作用而导致的Li+溶解.
- 配制的电解质使LiNi0.8Co0.1Mn0.1O2的液晶电池在-30°C下稳定循环超过100个循环.
- 在5.0C速率下实现了154mAhg-1的高容量,展示了出色的快速充电性能.
结论:
- 电解质溶解化学策略有效地提高了在极端条件下金属电池的性能.
- 该研究提供了一个理解电解质行为的模型,并提供了用于设计高要求应用的先进电解质的见解.
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