在可充电Na/Cl电池2上发光
Guanzhou Zhu1, Peng Liang1, Cheng-Liang Huang2,3
1Department of Chemistry and Bio-X, Stanford University, Stanford, CA 94305.
概括
可充电/电池使用碳电极,可逆地形成碳-键,并在充电过程中捕获气. 这一过程使得高容量的能量储存成为可能,进步了电池技术.
科学领域:
- 电化学和材料科学 材料科学
- 先进的能源存储解决方案
背景情况:
- 对于高效的能源存储的日益增长的需求需要新的可充电电池化学成分.
- 之前的工作建立了使用金属阳极和碳阴极的可充电/ (Na/Cl2) 和/ (Li/Cl2) 电池.
研究的目的:
- 阐明在Na/Cl2电池运行期间无形碳纳米圈 (aCNS) 阳极内的详细反应机制.
- 研究aCNS电极在充电和放电周期中的结构和化学变化.
主要方法:
- 射线光电子光谱 (XPS) 用于识别表面化学物种,包括碳- (C-Cl) 键和被捕获的分子 (Cl2).
- 同步射线X射线衍射 (XRD) 分析aCNS电极的结构变化,观察图形排序的发展.
- 质谱测试以确认充电过程中Cl2的存在.
主要成果:
- 充电Na/Cl2电池导致aCNS电极的化,形成C-Cl键,并以Cl2透到孔隙结构中.
- aCNS电极在充电时经历可逆石墨排序,在放电时无形化,与氧化还原转换相关.
- 通过XPS和质谱测量,证实了在多孔碳电极内存在和可逆的Cl2物种.
结论:
- 可充电Na/Cl2电池的化学结构涉及NaCl和Cl2之间的氧化还原转换,以及碳电极的可逆结构变化.
- 形成C-Cl键和可逆石墨序列是使这些先进电池具有高循环容量的关键机制.
- 这项研究提供了关键的洞察力,了解了控制基可充电电池性能的基本过程.
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