通过在以太电解质中定制溶解结构来实现稳定的高温金属电池
Yongchuan Liu1, Yuansheng Lin1,2, Zhanlin Yang2
1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, Fujian 350002, People's Republic of China.
ACS nano
|October 11, 2023
概括
这项研究引入了一种用于高温金属电池 (LMB) 的新型电解质. 新的DGDME-LHCE增强了稳定性和安全性,即使在恶劣的条件下,也可以实现长时间的高效电池性能.
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:
- 金属电池 (LMB) 的高工作温度会导致容量衰减,并由于不稳定的接口和电解质结构而引起安全问题.
- 开发先进的电解质对于在苛刻的条件下稳定的LMB运行至关重要.
研究的目的:
- 为了设计一个稳定的局部高度电解质 (LHCE) 使用二乙烯糖醇二甲基乙烯 (DGDME) 高温LMBs.
- 为了研究电解质形成稳定的电极-电解质界面并提高电池性能的能力.
主要方法:
- 计算建模和实验验证用于描述DGDME-LHCE.
- 在高温 (60°C) 和高电压 (4.5V) 的情况下对Li的能量和Li的能量NCM523电池进行电化学测试.
主要成果:
- 该DGDME-LHCE表现出高的Li+结合稳定性,电氧化阻力,热稳定性和不易燃性.
- 一个量身定制的溶解结构促进了阴极和阳极的稳定界面,确保了统一的涂/脱落和高压耐受性.
- 立体二烯基Li细胞的寿命超过1900小时,而立体二烯基NCM523细胞在250个周期内保持了95.59%的容量,具有>99.88%的库伦比效率.
结论:
- 通过提高接口稳定性和电化学性能,DGDME-LHCE为高温LMB提供了一个有前途的解决方案.
- 这种以太电解质策略为开发强大的LMB提供了一条途径,这些LMB可以承受严格的高温操作挑战.
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