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通过动态电双层为实用离子电池制定自修固体电解质接口.
1Power Battery and Systems Research Center, State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China.
Angewandte Chemie (International ed. in English)
|July 23, 2024
概括
一种新的双站式添加剂创建了一个动态的电气双层和自我修复的SEI,提高离子电池的性能和稳定性. 这项创新解决了实际的,持久的电池的关键接口挑战.
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:
- 离子电池 (ZIB) 面临着富含水的电双层 (EDL) 和不稳定的固体电解质介面 (SEI) 的挑战.
- 这些接口问题阻碍了ZIB的长期稳定性和实际应用.
研究的目的:
- 为实际的ZIB开发一个动态的EDL和一个自我修复的混合SEI.
- 为了改善界面动力学,调节 Zn 沉积,并抑制循环过程中的副作用.
主要方法:
- 将一个水平定向的双站点添加剂纳入ZIB系统.
- 通过电化学分解分析添加剂在构建动态EDL和自我修复的有机-无机混合SEI中的作用.
- 在各种条件下评估电池性能,包括长期循环,精益电解质,高负载和低温.
主要成果:
- 动态EDL和自我修复的SEI有效地加快了接口动力学并抑制了副作用.
- 在42.7%的排放深度下,在500小时内实现了高可逆性.
- Zn//NVO全电池在10,000个循环中表现出极好的循环稳定性,在3A·g-1下保持100%的容量,在稀疏电解质和高负载条件下表现出超过3000个循环.
- 这一策略甚至在低温 (-30°C) 充满细胞中也被证明是有效的.
结论:
- 拟议的动态EDL和自我修复的混合SEI战略显著提高了ZIB的性能和耐用性.
- 这种方法为克服实际ZIB应用中的接口限制提供了一个有希望的解决方案.
- 该方法显示了广泛的适用性,包括具有挑战性的条件,如低温和高能量密度.
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