通过基于Li的固体电解质介质修改的超薄石墨烯电极实现快速和高效的K+介质
Jingshu Hui1, Noah B Schorr1, Srimanta Pakhira2,3,4,5
1Department of Chemistry , University of Illinois at Urbana-Champaign , 600 South Mathews Avenue , Urbana , Illinois 61801 , United States.
Journal of the American Chemical Society
|October 10, 2018
概括
研究人员通过使用离子 (Li+) 电解质对固体电解质间相 (SEI) 进行调节,以提高离子 (K+) 电池的性能. 这一战略可实现高效的K+插电和快速充电,用于下一代储能.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 超越离子 (Li+) 电池需要探索替代的离子化工学,例如离子 (K+) 系统.
- 在下一代电池技术中,开发高性能K+间隔电极至关重要.
- 几层石墨烯 (FLG) 作为研究基本离子间隔机制的模型系统.
研究的目的:
- 证明一种方法可显著提高FLG电极中的K+间隔性能.
- 研究固体电解质间相 (SEI) 在K+间中的作用.
- 建立FLG作为离子间隔的基础研究平台.
主要方法:
- 用含有Li+的电解质调节超薄几层石墨烯 (FLG) 电极,以形成基于Li+的SEI.
- 电化学特征包括循环电量测量 (CV) 和静电循环.
- 在现场进行拉曼光谱,以确认离子间隔过程.
- 进行质谱深度分析以验证K+运输.
主要成果:
- 基于Li+的SEI在FLG电极上实现了高效的K+互,与导致层的K+电解质不同.
- 通过CV观察到高达100mVs-1的离散阶段过渡.
- 在现场的拉曼光谱证实了K+间隔过程.
- 修改后的接口实现了快速的充放电率 (高达360°C) 和卓越的循环稳定性 (10°C时1000个循环).
- 质谱测试证实SEI促进了K+运输.
结论:
- 用含有+的电解质调节SEI是一种可行的策略,以提高K+间隔电极的性能.
- 具有+条件的FLG电极为实用的K离子电池提供了一个有前途的途径.
- FLG作为一种有效的模型系统,用于对离子间隔机制和SEI效应的基础研究.
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