过渡金属二硫化物原子层用于聚硫化物电催化
Ganguli Babu1, Nirul Masurkar1, Hesham Al Salem1
1Department of Mechanical Engineering, Wayne State University , Detroit, Michigan 48202, United States.
Journal of the American Chemical Society
|December 22, 2016
概括
过渡金属二化物 (TMD) 通过控制聚硫化物穿来稳定-硫 (Li-S) 电池. 这项研究表明,
科学领域:
- 电池技术
- 材料科学
- 电化学
背景情况:
- -硫 (Li-S) 电池具有高能量密度,但受到"多硫化物穿"效应的影响.
- 控制聚硫化物溶解对于稳定的Li-S电池性能至关重要.
- 硫电极的表面特性及其催化作用尚不清楚.
研究的目的:
- 研究电催化过渡金属二甲基化物 (TMDs) 在Li-S电池中稳定聚硫化物穿的使用.
- 阐明TMD的电极/电解质界面上的物理化学转换.
- 合成和描述具有催化活性的纳米结构TMD.
主要方法:
- 对原子薄单层/数层TMD进行光谱和显微分析.
- 研究电化学特性,包括激活能量和交换电流密度.
- 使用基于液体的剪切剥离,大量合成纳米结构的TMD.
主要成果:
- TMDs优先吸附更高阶的液态聚硫化物.
- 聚硫化物转化为低级固体物种,在TMD边缘部位形成树突状结构.
- 在0.5°C下达到590mAhg-1的特定容量,并且在350个循环中保持稳定.
结论:
- 电催化TMD有效地稳定了Li-S电池中的多硫化物穿.
- 了解接口转换是提高电池稳定性和能量密度的关键.
- 两维TMD显示了下一代电池应用的巨大潜力.
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