对于非水性室温硫电池的间歇式催化剂
Jiarui He1, Amruth Bhargav1, Laisuo Su1
1Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712, USA.
Nature communications
|October 17, 2023
概括
环境温度硫 (Na-S) 电池提供高能量密度,但受到聚硫化物穿的影响. 这项研究引入了使用MoTe2催化剂和硫的混合电极,显著提高了Na-S电池的性能和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 环境温度硫 (Na-S) 电池是离子电池的有希望的替代品,因为它们具有高的理论特异能和丰富的硫资源.
- 阻碍实用的Na-S电池应用的一个主要挑战是聚硫化的穿效应.
研究的目的:
- 为环境温度Na-S电池开发一种新型的间歇转换混合正极材料.
- 为了解决多硫化穿问题,并提高电池性能和稳定性.
主要方法:
- 连接一个介质类型的催化剂,二甲化物 (MoTe2),与转化类型的活性物质,硫.
- 在石墨烯片上垂直生长的MoTe2纳米板,以创建丰富的催化站点.
- 在多余 (Na) 的硬币电池中组装一个复合正极.
- 利用现场基于同步的操作式X射线衍射和现场飞行时间的二次离子质谱仪进行机械研究.
主要成果:
- 实现了1081mAh的高放电容量 (基于硫质量).
- 证明了卓越的周期稳定性,容量衰减率为0.05%每周期超过350个周期在0.1°C.
- 在苛刻的条件下运行:高硫负载 (3.5毫克-2毫克) 和稀疏电解质 (7毫升-1毫克).
- 揭示了MoTe2在硫氧化还原反应中的电催化机制.
结论:
- 开发的MoTe2-硫混合电极有效地抑制了Na-S电池中的聚硫化物穿.
- 这种混合材料显示出高性能,稳定的环境温度Na-S电池应用的巨大潜力.
- 这项研究提供了对MoTe2在Na-S电池化学中的催化作用的基本见解.
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