高能量的LiNiO2金属电池由由离子液体组成的混合电解质和微弱溶解的化乙烯组成的混合电解质启用
Qian Liu1, Jiayi Xu1, Wei Jiang2
1Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 S. Cass Ave., Lemont, IL, 60439, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|October 17, 2024
概括
研究人员开发了一种用于金属电池的混合电解质. 这种新的电解质使高能氧化阴极能够稳定循环,实现近乎理论的容量和长周期寿命.
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:
- 高能量密度电池需要先进的电极材料,如金属阳极和高阴极.
- 这些具有攻击性的电极材料对传统的电解质构成重大挑战.
- 开发稳定的电解质对于下一代电池性能至关重要.
研究的目的:
- 设计和评估用于金属电池的新型混合电解质.
- 为了实现金属阳极和LiNiO2阴极的稳定和可逆循环.
- 了解电解质性能背后的基本机制.
主要方法:
- 使用化离子液体和化以太制造混合电解质.
- 对Li/LiNiO2全细胞进行电化学测试.
- 广泛的材料表征 (例如,SEM,XPS).
- 计算建模包括分子动力学 (MD) 和密度函数理论 (DFT).
主要成果:
- 混合电解质促进了带有LiNiO2 (100%Ni) 阴极的Li/LiNiO2电池的可逆循环.
- 实现了高容量 (高达249 mAh g-1),超过300个循环和78.6%的容量保留.
- 在阳极和阴极上证明没有有害的形态变化.
- 在+溶解环境中发现了由化引发的显著变化.
结论:
- 混合电解质有效地稳定了金属阳极和LiNiO2阴极接口.
- 化以太在稀释之外发挥着关键作用,改变Li+溶解和界面化学.
- 这项工作为高能电池的电解质设计策略提供了基本的见解,并为下一代电解质开发开辟了道路.
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