一个弱键分子稳定了实用的离子电池的硬碳阳极
Yaqi Liao1, Han Liu1, Yangqian Zhang1
1Department of Physics, JC STEM Lab of Energy and Materials Physics, City University of Hong Kong, Hong Kong 999077, P. R. China.
ACS nano
|August 16, 2025
概括
一种新的电解质添加剂,甲基2,2-二二二硫酸 (MDFA),显著提高了离子电池的稳定性. 它能够实现超过5000个循环,具有高容量,性能优于传统的添加剂.
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:
- 固体电解质间相 (SEI) 对于离子电池 (SIB) 的稳定性至关重要,防止直接电解质-阳极接触.
- 像乙烯碳酸盐 (FEC) 这样的常规添加剂由于硬碳 (HC) 阳极上的添加剂减少延迟而表现出有限的SEI形成效率.
研究的目的:
- 引入甲基2,2-二二二硫乙酸盐 (MDFA) 作为一种新的电解质添加剂,以改善SIB中的SEI形成.
- 研究MDFA的弱键化学机制,促进早期SEI形成和抑制寄生反应.
主要方法:
- 用MDFA和FEC添加剂对HC阳极进行电化学性能测试.
- 分析SEI的组成和界面特性.
- 长期循环稳定性测试和容量保留测量.
主要成果:
- MDFA促进了优惠减排,导致形成提高离子导电性的无机SEI组件.
- 使用MDFA的HC阳极实现了超过5000个稳定周期,在5°C时具有252 mAh g-1的高容量,显著优于FEC (108 mAh g-1).
- 使用MDFA的4.6Ah袋式电池在1000个循环后显示出89.3%的容量保留.
结论:
- MDFA的弱键化学物质使SIB中能够形成优异的SEI和电化学性能.
- 这些发现突显了MDFA作为一种有前途的电解质添加剂的潜力,用于开发长寿命,高性能SIB.
- 这项研究为设计基于键化学的电解质添加剂提供了宝贵的见解,用于先进的离子能量存储.
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