溶解结构和衍生式相间调节,用于高压金属电池的高安全性,使用化离子液基双盐电解质,以化离子液为基础
Yixing Li1,2, Fangwei Ding1,2, Yueyue Shao3,4
1College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518071, China.
Angewandte Chemie (International ed. in English)
|January 3, 2024
概括
研究人员开发了一种用于高压金属电池的新型,非易燃的离子液体电解质. 这种电解质增强稳定性,防止树突,并改善循环性能,用于下一代储能.
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:
- 高压金属电池 (LMB) 需要对Li阳极和阴极 (>4.5V) 稳定的电解质.
- 目前的电解质面临着不良循环稳定性和热失控风险的挑战.
- 开发安全高效的电解质对于推进LMB技术至关重要.
研究的目的:
- 设计和合成一种新型的宝石二离子液 (IL) 用于稳定高压LMB电解质.
- 为了研究电解质与高压阴极和阳极的兼容性.
- 评估LMBs中开发的电解质的电化学性能和安全性.
主要方法:
- 合成了一种新的宝石脱离子离子液体.
- 使用双盐和辅溶剂 (二甲基碳酸盐) 制备不可燃电解质.
- 使用核磁共振 (NMR) 谱学的Li+离子溶解结构的表征.
- 对LiNi0.6Co0.2Mn0.2O2/Li和LiNi0.88Co0.09Mn0.03O2/Li电池进行电化学测试.
主要成果:
- 这种新型电解质具有很高的安全性,可以防止热失控.
- 证明了与高压阴极和金属阳极的良好兼容性.
- 一个强大的,富含F的相间层被形成,使得Li-dendrite预防和高可逆性.
- LiNi0.6Co0.2Mn0.2O2/Li电池 (4.5V) 在300个循环中实现了90.4%的容量保留,CE>99.99%.
- 实现了高压 (4.7V) 操作和超高丰富系统的优异性能.
结论:
- 基于宝石二化离子液体的电解质为高压LMB提供了一个有前途的解决方案.
- 增强的相间化学和受控的溶解结构是提高电池性能和安全的关键.
- 这项工作突出了化ILs在推进下一代金属电池技术方面的潜力.
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