循环以太衍生稳定固体电解质间相在木阳极上,用于超高速的离子储存.
Xiaoshan Zhang1, Jinxin Lin1, Xueqing Qiu1,2,3
1School of Chemical Engineering and Light Industry, Guangdong University of Technology (GDUT), 100 Waihuan Xi Road, Panyu District, Guangzhou, 510006, China.
Small (Weinheim an der Bergstrasse, Germany)
|June 7, 2024
概括
循环四二 (THF) 电解质使得比 2-甲基四二 (MeTHF) 的相比,在斯木特阳极中能够更好地储存离子. THF电解质形成一个稳定的,富含无机的固体电解质介相 (SEI),在高电流密度下提高性能.
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:
- 木阳极提供高的理论离子储存能力.
- 稳定的固体电解质间相 (SEI) 形成对电池性能至关重要.
- 众所周知,以太溶剂可促进SEI的稳定性.
研究的目的:
- 通过使用循环四水 (THF) 和2甲基四水 (MeTHF) 电解质,研究木松阳极的离子储存特性.
- 分析电解质溶解结构和SEI组成对离子储存动学的影响.
- 了解SEI特性在确定阳极性能中的作用.
主要方法:
- 比斯木特阳极的电化学表征.
- 对电解质溶解结构的分析.
- 详细的SEI化学成分分析.
- 在各种电流密度下进行性能测试.
主要成果:
- 在THF和MeTHF电解质中的木阳极在低电流密度下表现出良好的速率性能.
- 基于THF的电解质在高电流密度下产生显著更高的可逆容量 (316.7 mAh g-1在THF中,而9.7 mAh g-1在50 A g-1的MeTHF中).
- THF电解质形成了一个薄,均,富含无机物的SEI,而MeTHF电解质形成了一个更厚的SEI,有更多的有机成分.
结论:
- 该SEI的组成和形态极大地影响了离子储存动力学.
- 基于THF的电解质优于高速离子储存,由于优化了SEI形成,具有木阳极.
- 这项研究为开发用于离子电池的先进电解质提供了洞察力.
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