对于超长寿命金属电池的二元溶剂诱导稳定介相层.
Rinish Reddy Vaidyula1, Mai H Nguyen1, Jason A Weeks1
1Department of Chemistry, The University of Texas at Austin, Austin, TX, 78712, USA.
Advanced materials (Deerfield Beach, Fla.)
|March 11, 2024
概括
稳定的金属电池 (SMB) 是通过添加2-甲基四水 (MTHF) 辅溶剂到diglyme (Dig) 电解质来实现的. 这优化了溶解结构,形成一个统一的固体电解质介相 (SEI) 层,以提高电池性能和寿命.
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:
- 金属电池 (SMB) 具有高能量密度,但由于反应性金属和不稳定的固体电解质介相 (SEI) 层,其可逆性较差.
- 发展稳定高效的中小企业对于下一代储能解决方案至关重要.
研究的目的:
- 通过优化电解质溶解结构来提高金属电池的稳定性和性能.
- 调查辅溶剂添加对SEI层形成和电池循环性能的影响.
主要方法:
- 调整电解质溶解结构,通过添加2-甲基四水 (MTHF) 作为Diglyme (Dig) 的共同溶剂.
- 使用飞行时间质谱分析溶解结构和SEI层组成.
- 进行电化学循环测试,使用CuvadaRoseNa和NaRoseNa对称电池,以及使用Na0.44MnO2阴极的全电池.
主要成果:
- 该MTHF共同溶剂促进一个阳离子主导的溶解结构,导致一个薄而均的SEI层.
- 一个Dig:MTHF (50%v/v) 电解质在Cu
- 一个对称的细胞表现出超过7000小时的稳定性,500个循环后,完整的细胞保持了80%的容量.
结论:
- 使用基于MTHF的二元溶剂优化电解质溶解结构是实现高性能和长期稳定的中小企业的关键.
- 该研究强调了环境可持续的辅溶剂在推进金属电池技术方面的潜力.
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