在带有双介质的Li-O电池中Li2CO3的积累
Max Jenkins1, Daniel Dewar1, Tammy Nimmo1
1Department of Materials, University of Oxford, Parks Road, Oxford, UK. peter.bruce@materials.ox.ac.uk.
Faraday discussions
|October 2, 2023
概括
氧电池中的溶剂降解会导致碳酸的积聚,阻碍性能. 使用氧化还原介质去除这种积累可以部分恢复细胞功能并延长电池寿命.
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:
- 溶剂降解是氧 (Li-O2) 电池长周期寿命的一个关键问题.
- 通常使用的溶剂,以太,降解形成碳酸 (Li2CO3),这阻碍了电池的功能.
研究的目的:
- 在Li-O2电池循环过程中,研究Li2CO3在气体扩散电极中的积累和分布.
- 建立Li2CO3积累和细胞衰竭机制之间的关系.
- 为了评估氧化还原介质在去除Li2CO3和恢复电池性能方面的有效性.
主要方法:
- 使用以太基电解质循环使用的Li-O2电池.
- 对气体扩散电极的分析,以研究Li2CO3的形成和分布.
- 用氧化还原介质去除Li2CO3沉积物的方法.
- 在去除Li2CO3之前和之后对Li-O2细胞的性能评估.
主要成果:
- 观察到Li2CO3在循环过程中在气体扩散电极孔内积聚.
- 这种积累直接与细胞极化增加和容量衰减有关,这表明细胞衰竭.
- 反氧介质治疗成功地去除了Li2CO3,导致细胞性能部分恢复.
结论:
- 在气体扩散电极中形成和沉积Li2CO3是导致Li-O2电池容量衰减的主要原因.
- 以氧化还原为媒介的Li2CO3的去除提供了一个可行的策略,以减轻降解和延长Li-O2电池的循环寿命.
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