构建高效/碳阳极的新策略:化学预化和电解质后处理
Dan Hu1, Caiyun Wu1, Qiubo He1
1College of Chemistry and Chemical Engineering & College of New Energy and Electrical Engineering & Ministry of Education Key Laboratory for Green Preparation and Application of Functional Materials, Hubei University, Wuhan 430062, PR China.
Journal of colloid and interface science
|February 26, 2025
概括
使用-/2-甲基四基 (Li-Phe/2-MTHF) 的化学预化和使用LiDFBOP的后处理产生了一个稳定的固体电解质接口 (SEI) 膜. 这大大提高了/碳阳极的初始效率 (ICE) 和长期循环性能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- /碳 (Si/C) 阳极由于固体电解质接口 (SEI) 形成和损失,因此具有较低的初始效率 (ICE).
- 化学预化是减轻损失和增强Si/C阳极中的ICE的关键策略.
研究的目的:
- 为Si/C阳极开发一种新的化学预化和后处理策略.
- 创建一个具有增强稳定性和离子导电性的人工SEI膜.
- 为了提高Si/C阳极的初始库伦比克效率和长期循环性能.
主要方法:
- /阳极使用1M-/2-甲基四 (Li-Phe/2-MTHF) 溶液进行了预化.
- 预先化阳极经过了含有二二氧化 (LiDFBOP) 的商业电解质的后处理.
- 分析了人工SEI膜的组成和性能.
主要成果:
- PSi/C-L0.5阳极形成了富含LiF,Li2C2O4和Li3P的人工SEI膜,确保了SEI的稳定性和改善了Li+运输动力学.
- 在PSI/C-L0.5.5中获得了92.50%的ICE.
- 经过近500次循环以1A/g的速度后,表现出极好的循环稳定性,容量保持率为97.8%.
结论:
- 开发的前化和后处理方法有效地构建了一个稳定的SEI薄膜,具有卓越的Li +动力学.
- 这种方法显著提高了Si/C阳极的电化学性能,性能优于未经处理的Si/C.
- 为设计用于高性能离子电池的先进SEI膜提供了一个有前途的策略.
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