皇冠乙醇电解质诱导Li2O无形化用于低极化和长寿命的Li-O电池
Meng Li1,2, Jiaxin Wu1,2, Zichang You1,2
1The State Key Lab High Performance Ceram & Superfine Microstructure Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050, Shanghai, P. R. China.
Angewandte Chemie (International ed. in English)
|April 24, 2024
概括
这项研究使用15-皇冠-5以太 (C15) 来使氧化在氧电池中变形,提高容量并减少电荷偏振,以提高电池性能.
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
背景情况:
- 氧电池具有较高的理论能量密度,但周期寿命较短,电荷极化较高.
- 氧电池的商业化受到排放产品形成和分解管理方面的挑战的阻碍.
研究的目的:
- 研究使用15-皇冠-5以太 (C15) 作为溶剂添加剂,以调节氧电池中排放产品的形成.
- 通过促进过氧化的无形化,提高氧电池的电化学性能和循环稳定性.
主要方法:
- 使用15-皇冠-5以太 (C15) 作为氧电池电解质中的溶剂.
- 使用电化学方法分析排放产品 (Li2O2) 的结构特征.
- 评估电池性能指标,包括放电容量,充电超电位和循环寿命.
主要成果:
- 该C15溶剂有效地将晶体Li2O2无形化为易于分解的无形形式.
- 使用0.5M的电解质C15将放电能力提高到5.7 mAh/cm2,并将电荷超电位降低到0.88 V.
- 带有1M C15的电池表现出140个周期的稳定循环,而带有LiI的电池,实现了190个周期,降低了超电位 (0.74V).
结论:
- 15-皇冠-5以太 (C15) 是氧电池的一个有前途的电解质成分,促进Li2O2无形化.
- 2O2的无形化显著降低了电荷超电位,并改善了循环寿命.
- 这种方法为设计用于高性能氧电池的先进电解质提供了可行的策略.
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