对于低温离子电池的电解质溶解结构规则
Yangfeng Wang1,2, Jiachao Duan3, Zichen Zhu2
1SINOPEC Research Institute of Petroleum Processing Co. Ltd., Beijing 100083, PR China.
ACS applied materials & interfaces
|May 19, 2025
概括
开发用于寒冷气候的先进离子电池 (SIB) 需要克服低温容量衰减. 这项研究引入了一种新型的电解质配方,使用二甲基乙烯基醇二甲基乙烯,1,3-二氧化和三甲基西异酸盐来提高SIB在结条件下的性能.
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:
- 高性能离子电池 (SIB) 对于电网规模的能源存储至关重要.
- SIBs的低温性能受到Na+缓慢溶解动力学的阻碍,导致容量迅速衰减.
- 目前的电解质配方在零度以下的环境中难以保持稳定性和效率.
研究的目的:
- 为SIBs开发一种新的电解质系统,以确保在低温下有效运行.
- 为了应对Na+溶解的挑战,并改善SIB在寒冷条件下的电化学稳定性.
- 提高SIB在低至-40°C的温度下保持容量和循环稳定性.
主要方法:
- 基于二乙烯糖醇二甲基乙烯 (DEGDME) 的新电解质的配方,其中1,3-二氧化 (DOL) 作为辅溶剂,三甲基异酸盐 (Si-NCO) 作为添加剂.
- 优化电解质的溶解结构,以提高PF6-离子的参与和稳定性.
- 在-40°C的温度下对半电池和全电池 (O3型NFMN//HC) 进行电化学测试,以评估容量保留和循环性能.
主要成果:
- 设计的电解质显著提高了低温性能,NaidiyegadgadgadHC半电池在-40°C下保持了88.57%的室温容量.
- 实现了卓越的循环稳定性,在 -40 °C的半电池中进行了100个循环后,显示了94.50%的容量保留.
- 完整电池 (NFMN//HC) 在-40°C的100个循环后显示出83.73%的容量保留,突出了电解质的实用性.
结论:
- 开发的电解质配方有效地提高了SIB在低温下的电化学稳定性.
- 优化的溶解结构,涉及增加PF6-离子参与,是克服低温性能限制的关键.
- 这项研究为在极寒环境中运行的下一代SIB设计先进电解质提供了宝贵的见解.
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