无机丰富的固体电解质介面:提高离子电池循环稳定的关键?
Zhiyuan Guo1, Mei Yang1, Qi Fan1
1School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Small (Weinheim an der Bergstrasse, Germany)
|October 1, 2024
概括
使用有机醇硫酸盐和化的新型混合固体电解质介相 (SEI) 增强了离子电池的稳定性. 这种优化的SEI层提高了阴极和阳极材料的循环性能和容量保留.
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 (SIB) 的性能严重依赖于在电极接口形成的固体电解质介面 (SEI).
- 现有的研究往往侧重于含有无机元素的SEI层,这可能会限制接口稳定性和电池寿命.
研究的目的:
- 调查一个平衡的有机-无机混合SEI对SIB业绩的影响.
- 优化SEI组合,以提高界面稳定性和降低阻抗.
主要方法:
- 开发一种包含有机硫酸 (ROSO2Na) 和化 (NaF) 的定制电解质.
- 由此产生的SEI层在Na0.9Ni0.4Fe0.2Mn0.4O2阴极和硬碳阳极上的表征.
- 电池性能的电化学测试,包括循环稳定性和容量保留.
主要成果:
- 形成一个薄而均的,富含NaF/ROSO2Na的SEI层,有效地防止接口恶化和过渡金属溶解.
- 显著减少了接口阻抗.
- 在500个循环后,Na0.9Ni0.4Fe0.2Mn0.4O2阴极实现了>99.9%的平均库伦比效率和81%的容量保留.
- 一个Ah级袋式电池在400个循环后显示出87%的容量保留.
结论:
- 一种定制的有机-无机混合SEI配方为SIBs提供了比纯无机SEI层更优质的替代方案.
- 这种方法显著提高了接口稳定性,从而提高了电池性能和循环寿命.
- 这些发现为推进离子电池技术提供了一个可适应的战略.
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