没有阳极的硫电池与稀土三酸盐作为双重功能电解质添加剂
Yin-Ju Yen1, Arumugam Manthiram1
1Materials Science & Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, United States.
ACS applied materials & interfaces
|June 28, 2024
概括
新三酸盐添加剂通过改善沉积和阴极转换来稳定无阳极硫电池. 这提高了性能,使高容量和Coulombic效率用于实际的电池应用.
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:
- 无阳极的硫电池提供高能量密度,但在沉积和阳极稳定性方面面临挑战.
- 控制的剥离/沉积对于实际的无阳极全电池配置至关重要.
- 修改电解质化学物质以保护固体电解质间相是保护阳极的关键策略.
研究的目的:
- 调查三酸盐 (Nd(OTf) 3作为无阳极硫电池中的电解质添加剂的双重功能作用.
- 为了增强阴极转换反应和阳极稳定,以提高电池性能.
- 为了证明一种可行的阳极保护方法,并实现高库伦比效率.
主要方法:
- 使用三酸盐 (Nd(OTf) 3) 作为双重功能电解质添加剂.
- 研究其对阴极转换反应同质催化作用的影响.
- 分析其在保护金属阳极和稳定剥离/沉积方面的作用.
- 在LiLi2S半细胞和NiLi2S无阳极全细胞中测试性能.
主要成果:
- Nd(OTf) 3促进了多硫化物吸附,促进了阴极转换反应.
- 添加剂有效地保护金属阳极,确保稳定的剥离和沉积.
- Li2S半细胞和没有阳极的NiLi2S全细胞实现了高面积容量 (5.5-7.0 mA h cm-2).
- 在循环过程中保持了持续高的库伦比克效率 (94-95%).
结论:
- 三酸作为无阳极硫电池的有效双重功能添加剂.
- 使用Nd(OTf) 3进行电解质修饰显著提高了阴极和阳极性能.
- 这种方法使得具有实际潜力的高性能无阳极硫电池成为可能.
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