生命衰老效应作为调节无素Mg电解质性能的调节过程
Eslam Sheha1, Shengqi Fan2, Mohamed Farrag1
1Physics Department, Faculty of Science, Benha University, 13518 Benha, Egypt.
Langmuir : the ACS journal of surfaces and colloids
|November 7, 2023
概括
使用无电解质 (HFEs) 的老化电池可以提高电化学性能. 陈旧的HFEs降低了过量的电力和电阻,提高了硫细胞容量和循环寿命.
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:
- 高效的电池对于下一代能源储存至关重要.
- 电解质调节显著影响电池性能.
- 了解电解质衰老是优化电池设计的关键.
研究的目的:
- 调查老化时间对电池的无电解质 (HFE) 的影响.
- 为了将电解质条件与电化学性能相关联.
- 为了提高-硫 (Mg-S) 细胞的周期寿命和效率.
主要方法:
- 在乙二 (ACN) 和四乙烯糖醇二甲基乙烯 (G4) 中利用的Mg(NO3) 2作为无素电解质 (HFE).
- 分析了老化与新鲜的HFE,使用表征技术来研究批量物种化和Mg2+溶解.
- 评估了电化学性能,包括Mg涂层/剥离,超电位和散装电阻.
- 测试的Mg-S细胞与新鲜和老化的HFEs在电流密度为0.02 mA cm-2.
主要成果:
- 老龄化诱导的大量物种化和Mg2+溶解屏障在HFE中的明显变化.
- 与新鲜的HFE相比,老化的HFE表现出较低的Mg涂层/脱落过量的潜力和较低的散装阻力.
- 经过老化HFE的Mg-S电池实现了更高的特异容量 (586 mA h/g) 和更好的库伦比效率.
- 具有老化HFE的细胞表现出延长周期寿命 (高达30个周期) 与新鲜HFE (短周期寿命) 相比.
结论:
- 电解质老化显著提高了无素电解质的电化学性能.
- 老化过程优化了Mg2+溶解,降低了电阻,从而改善了Mg-S电池的功能.
- 这项研究为电解质调节如何提高电池寿命和效率提供了新的视角.
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