调整全气候离子电池的电解质和相间化学
Mengxue He1, Lujun Zhu1, Guo Ye1
1Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials, School of Materials Science and Engineering, Peking University, Beijing, 100871, China.
Angewandte Chemie (International ed. in English)
|March 12, 2024
概括
这项研究引入了全气候离子电池 (SIB) 的新型电解质,提高了从-45°C到60°C的性能. 新的电解质可确保稳定的运行和在极端温度下延长循环寿命,用于电网规模的能源存储.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池 (SIB) 对于电网规模的能源存储至关重要.
- 极端温度会对SIB性能产生负面影响,原因是电解质导电性差,电极接口不稳定.
研究的目的:
- 为SIBs开发一种适用于所有气候的电解质.
- 为了增强离子扩散,Na+-溶解动力学和在广泛的温度范围内提高电极接口稳定性.
主要方法:
- 使用碳酸盐和乙烯 propionate 制备了一个平衡的电解质.
- 采用酸盐和酸基添加剂策略用于电极相间工程.
- 在45°C至60°C的温度下测试了纳米基酸细胞.
主要成果:
- 在零度以下的温度下实现了增强的离子扩散和Na+溶解动力学.
- 经过证明,均的,富含无机物的电极接口可提供出色的速率性能和循环稳定性.
- 在2C和-25°C观察到105mAhg-1的容量.
- 在60°C的3000个循环中保持84.7%的容量,在-25°C的500个循环中保持95.1%的容量.
结论:
- 电解质和相间工程对于开发高性能,适用于所有气候的SIB至关重要.
- 拟议的电解质使SIB在多样化和极端环境中能够稳定和高效地运行.
- 这项工作为可靠的SIB在苛刻的电网规模应用中铺平了道路.
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