量身定制的离子增强溶解膜层促进溶液相介导的Li-O电池
Fengling Zhang1, Zhengqiang Hu1, Jingning Lai1
1Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.
Angewandte Chemie (International ed. in English)
|October 16, 2024
概括
氧电池 (LOB) 通过向化电解质添加聚酸盐来实现更高的效率和稳定性. 这项创新保护了阳极,并增强了充电转移动力学,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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 氧电池 (LOB) 的高超电位是由缓慢的电荷转移动力学引起的.
- 化 (LiBr) 氧化还原介质减少过量的电位,但会导致阳极腐蚀和穿效应,降低效率.
- 在LOB中现有的氧化还原介质面临着稳定性和阳极兼容性的挑战.
研究的目的:
- 为氧电池 (LOB) 开发一个稳定高效的氧化还原介质系统.
- 为了减轻与传统LiBr介质相关的阳极腐蚀和穿效应的问题.
- 通过电解质修饰来提高LOB的循环稳定性和能源效率.
主要方法:
- 引入聚酸盐 (Li2MoO4) 进入含有LiBr的电解质用于LOBs.
- 分析阳离子增强的Li+溶解层和阳极上的固体电解质界面 (SEI) 形成.
- 对Li2MoO4对氧气,过氧化和物种的吸附能力的评估.
- 测试LOB性能,包括循环稳定性和能源效率.
主要成果:
- 在阳极上形成一个强大的离子衍生的SEI,有效地防止可溶物种和活性氧物种的腐蚀.
- Li2MoO4显示出强烈吸附O2/LiO2和Br相关物种,促进溶液阶段Li2O2的生长/分解,并抑制穿效应.
- 使用改性电解质的LOB实现了415个周期的显著循环稳定性和86.2%的高能效.
结论:
- 将Li2MoO4添加到基于LiBr的电解质中,显著提高了氧电池的稳定性和效率.
- 强大的SEI层和改进的吸附性能是减轻传统介质相关缺点的关键.
- 这种方法为先进的LOB系统的实际应用和可持续开发提供了一个有希望的途径.
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