一个可充电的Li-O2电池使用酸/N,N-二甲基胺电解质
Wesley Walker1, Vincent Giordani, Jasim Uddin
1Liox Power, Inc., 129 North Hill Avenue, Suite 103, Pasadena, California 91106, USA. wes@liox.com
Journal of the American Chemical Society
|January 31, 2013
概括
研究人员使用N,N-二甲基胺和酸开发了用于氧电池的稳定电解质. 这一突破使阳极能够长期循环使用,克服了电池开发中的一个主要挑战.
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:
- 可充电氧 (Li-O2) 电池在O2电极上的电解质稳定性面临着挑战.
- 极性,近极性溶剂,如直链胺,抵抗O2电极降解,但无法在阳极上形成稳定的固体电解质介相 (SEI).
- SEI的不稳定性导致Li金属和溶剂的快速分解.
研究的目的:
- 通过稳定SEI来证明阳极在N,N-二甲基胺 (DMA) 中的成功循环.
- 为-O2电池中的两个电极开发一个兼容的电解质系统.
- 为了可能消除对保护阳极的陶膜的需求.
主要方法:
- 使用酸 (LiNO3) 作为盐添加剂来稳定DMA中的SEI.
- 组装并循环使用一种具有新型电解质组成的Li-O2电池.
- 监控循环性能,容量保留,充电配置文件和气态产品.
主要成果:
- 在2000小时 (>80个循环) 的稳定阳极循环中,在0.1 mA/cm2时达到.
- 证明了一致的充电配置和良好的容量保留.
- 在充电过程中确定O2为主要气态产物,表明有效利用氧气.
结论:
- NO3添加剂成功地稳定了DMA中的SEI,使长期阳极循环成为可能.
- 这种电解质系统对推进可充电Li-O2电池技术充满希望.
- 这些发现可能会避免在Li-O2电池中需要单独的阳极保护.
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