使用聚乙烯氧化物和高度离子液体的高级高压电解质设计,用于全固态金属电池
Mingjie Zhang1,2, Urbi Pal2, Faezeh Makhlooghiazad2
1GAME Lab, Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy.
ACS applied materials & interfaces
|October 6, 2024
概括
这项研究引入了一种新型的高度离子液体电解质中的聚合物,用于更安全的固态金属电池. 新材料显著提高了离子导电性和氧化稳定性,使金属循环稳定,高性能电池运行.
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
- 聚合物化学 聚合物化学
背景情况:
- 基于聚乙烯氧化物 (PEO) 的固体聚合物电解质 (SPEs) 为金属电池 (LMB) 提供安全性.
- 目前基于PEO的SPEs面临着低离子导电性 (<10−6 S cm−1) 和有限的氧化稳定性 (<4 V) 的挑战.
- 这些局限性阻碍了它们在高能量密度固态LMB中的应用.
研究的目的:
- 设计和研究一种新型的聚合物高度离子液 (PiHCIL) 电解质.
- 为了提高SPEs的离子导电性和电化学稳定性,用于固态LMB.
- 探索新电解质系统中的结构-属性关系.
主要方法:
- 使用PEO,一种特定的离子液体 (C3mpyrFSI) 和LiFSI合成一种新的PiHCIL电解质.
- 系统地改变EO/[Li/IL]比率以优化电解质特性.
- 使用里埃变换红外光谱学和固态魔幻角度旋转核磁共振来研究协调和溶解的表征.
- 电化学测试,包括离子导电量测量,氧化稳定性测试,以及Li的对称细胞循环.
- 使用铁酸盐阴极组装和测试全固态电池.
主要成果:
- 开发的PiHCIL电解质具有5.1V的高氧化稳定性.
- 在30°C环境温度下达到5.6 × 10−4 S cm−1的离子导电性.
- 在100个循环中,在具有无树突形态的LiRLi对称细胞中,证明了稳定和可逆的金属循环.
- 所有固态细胞在C/5速率下100个周期后显示99.2%的容量保留.
结论:
- 新的PiHCIL电解质设计克服了传统的基于PEO的SPEs的主要局限性.
- 这种方法为能源密集的固态LMB开发高性能SPE提供了有希望的途径.
- 增强的离子导电性和稳定性对于安全高效的电池运行至关重要.
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