电解质对固体电解质间相 (SEI) 的贡献 快速循环下石墨阳极的演变
Omar Gómez Rojas1, Watcharaporn Hoisang1, Wataru Sugimoto1,2
1Institute for Aqua Regeneration, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan.
ACS applied materials & interfaces
|November 18, 2025
概括
较高的二 (硫) 胺 (LiFSI) 度和特定的离子液 (IL) 离子选择显著改善了高速率储能设备的循环稳定性和界面完整性. 添加乙烯碳酸盐 (VC) 通过抑制阴离子分解,产生一种保护性的有机固体电解质介相 (SEI).
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:
- 高速储能器件需要稳定的接口以获得最佳性能.
- 盐度和离子液体 (IL) 组成极大地影响了接口行为.
- 了解固体电解质间相 (SEI) 形成是提高设备寿命的关键.
研究的目的:
- 为了研究二 (fluorosulfonyl) 胺 (LiFSI) 度对化石墨阳极的影响.
- 分析离子液体 (IL) 离子标识在快速循环过程中如何影响SEI化学和稳定性.
- 评估乙烯碳酸盐 (VC) 作为SEI保护添加剂的作用.
主要方法:
- 在不同的LiFSI度 (1-4M) 中进行电化学测试.
- 在不同IL系统 (P13FSI,EmimFSI) 中对SEI化学进行了详细的电化学和表面分析.
- 具有和没有VC添加剂的SEI形成的比较研究.
主要成果:
- 较高的LiFSI度 (4M) 提高了循环稳定性和降低了界面阻力.
- 基于P13FSI的系统与VC通过环开放形成了一种保护性,有机丰富的SEI.
- 没有VC的基于EmimFSI的系统显示,由于离子分解,SEI逐渐退化.
结论:
- 离子结构和LiFSI度对于SEI化学和设备耐用性至关重要.
- 像VC这样的向添加剂可以抑制阴离子分解并增强SEI的自我保存.
- 优化IL/盐组合和添加剂策略对于高速率的储能系统至关重要.
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