使用离子液添加剂的高度混合电解质,用于稳定的高能量密度离子阳极
Mohammad Kahrizi1,2, Hiroyuki Ueda1,2, Tan Xing3
1Institute for Frontier Materials (IFM), Deakin University, 221 Burwood Highway, Burwood, Victoria 3125, Australia.
ACS applied materials & interfaces
|October 28, 2025
概括
一种新的离子液添加剂显著提高了电池阳极的稳定性. 这提高了/石墨和阳极的循环性能,为储能寿命增加了3倍.
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:
- 阳极提供高能量密度,但由于体积膨胀,其循环稳定性较差.
- 碳酸盐基电解质是常见的,但可以导致与阳极的不良副作用反应.
- 改善固体电解质间相 (SEI) 层对于稳定的阳极性能至关重要.
研究的目的:
- 为了研究离子液添加剂对/石墨 (Si/Gr) 和 (Si) 阳极的循环稳定性的影响.
- 分析添加剂对固体电解质介相 (SEI) 组成和形态的影响.
- 评估各种电池电池配置的性能提升.
主要方法:
- 用碳酸盐溶剂中的离子液体 (三甲基(异布) 二 (硫) 胺,P111i4FSI) 制备的电解质配方.
- 扩展的循环测试的Si/格里萨克LFP,SisakeLFP,金属SisakeNMC622,和Si/格里萨克NMC622.电池电池.
- 使用电压配置文件,dQ/dE,SEM和XPS进行分析,以描述SEI形成和故障机制.
主要成果:
- 离子液体添加剂显著改善了Si/Gr和Si阳极的循环稳定性.
- SEI分析显示,HCHE中存在和LiF,与减少的副作用相关.
- Si/Gr 阳极在 450 mAh/g 达到 96% 的效率在 185 个周期内,Si 阳极在 1000 mAh/g 达到 99.1% 的效率在 100 个周期内.
- 观察到细胞循环稳定的3倍改善.
结论:
- 离子液体添加剂通过修改SEI层来有效地稳定基于的阳极.
- 这种添加剂减轻了Si/Gr阳极中的SEI增长和可用性问题以及Si阳极中的结构退化.
- 这些发现表明,开发下一代高能量密度电池是一个有前途的战略.
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