实现动态体积补偿实现Ah级全固态硫电池的动态体积补偿
Zhaotong Hu1,2, Panyu Gao2, Shunlong Ju2
1Centre for Hydrogenergy, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China.
Nature communications
|April 28, 2025
概括
我们开发了一种新的压力中和硫 (Si-S) 电池设计,可以克服电极体积膨胀问题. 这种电池设计实现了先进电池的高能量密度和长期稳定性.
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
- 电池技术 电池技术
背景情况:
- 带有阳极的离子电池在循环过程中遭受体积波动,导致压力和故障.
- 目前的研究主要涉及材料层面的问题,忽视了阳极的细胞设计策略.
研究的目的:
- 介绍一个压力中和的-硫 (Si-S) 全细胞设计.
- 实施动态体积补偿以减轻压力并最大限度地利用Si-S电池中的活性材料.
主要方法:
- 利用和硫电极的自然体积变化动态.
- 采用动态体积补偿策略,实时压力监测和结构优化.
- 对Si-S全细胞设计的系统实施和定量分析.
主要成果:
- 实现了高特异能 (525 Wh/kg) 和容量 (1.24 Ah).
- 在500个循环中证明了长周期稳定性.
- 实现了25.12 mA/cm2的大面积电流密度.
结论:
- 压力中和的Si-S电池设计有效地减轻了残余压力和异质性.
- 这种方法增强了自然应力补偿,优化了高性能固态电池的电极行为.
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