用于双离子电池的基极聚合物基正电极:用基于gamma-butyrolactone的电解质提高性能
Katharina Rudolf1, Linus Voigt1, Simon Muench2,3
1University of Münster, MEET Battery Research Center, Institute of Physical Chemistry, Corrensstraße 46, 48149, Münster, Germany.
ChemSusChem
|May 15, 2024
概括
使用聚二,二,六四甲基烯-N-甲酸盐 (PTMA) 的双离子电池显示,在γ-butyrolactone (GBL) 电解质中使用特定的盐可以改善周期寿命和速率性能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 双离子电池 (DIB) 为特定应用提供了离子电池 (LIB) 的有希望的替代品.
- 基于聚合物的活性材料,如聚二二六甲基基基酸 (PTMA) 适用于高功率的DIB.
- 电解质配方对于优化DIB性能,特别是离子流动性至关重要.
研究的目的:
- 研究不同盐对基于PTMA的DIB性能的影响.
- 为了确定电解质,以提高周期寿命和速度能力,在PTMAdasajiLi金属细胞.
- 了解使用特定的盐添加剂提高电池性能背后的机制.
主要方法:
- 电化学测试的PTMA下载的金属电池与不同的盐 (LiDFOB,LiBOB) 在γ-butyrolactone (GBL) 溶剂.
- 与参考电解质 (基于LiPF6和碳酸盐) 的比较.
- 分析电荷转移,大众运输,伪容量贡献和过度潜力.
主要成果:
- 与参考电解质相比,二酸 (LiDFOB) 和二酸 (LiBOB) 的循环寿命显著改善.
- LiDFOB表现出优越的速率性能,在5.0 A g−1 (≈50C) 时保持约90%的容量.
- 增强的性能与更快的动力学,增加的伪电容和减少的金属电极超电位有关.
结论:
- LiDFOB和LiBOB是有效的电解质添加剂,用于增强基于PTMA的DIB.
- 盐的选择极大地影响了DIB性能,尤其是在高速率下.
- 这些发现为开发高功率的DIB铺平了道路,提高了稳定性和能源供应.
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