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纳米异晶催化剂由多重反应性描述器设计,用于Li-S电池中的加速氧化动力学

Wei Zhao¹, Yiyang Mao¹, Wangzixi Zhang¹

¹State Key Laboratory of Space Power-Sources, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.

|March 3, 2026

概括

研究人员开发了一种用于硫 (Li-S) 电池的新催化剂设计. Co/NbC@NC催化剂增强了聚硫化物 (LiPS) 的管理,提高了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
纳米技术纳米技术

背景情况:

硫 (Li-S) 电池具有较高的理论能量密度.
聚硫化物 (LiPS) 穿和低导电性阻碍了Li-S电池的性能.
不同质的过渡金属纳米晶体是LiPS管理的有希望的催化剂.

研究的目的:

为了建立一个合理的设计原则纳米异晶催化剂在Li-S电池.
为了研究催化剂结构和LiPS相互作用之间的关系.
为了提高电化学性能和Li-S电池的循环稳定性.

主要方法:

采用约束能量,d频段中心和结构因素作为反应性描述.
合成和表征了各种金属/NbC模型催化剂.
使用Co/NbC@NC@NC催化剂制造Li-S电池并评估其性能.

主要成果:

协同/NbC催化剂显示了升高的Nb d频段中心和额外的Co d频段催化中心.
催化剂显示出强大的LiPS吸收,快速的氧化还原动力学和密集的产品沉积.
带有Co/NbC@NC催化剂的Li-S电池表现出极好的速率性能和周期稳定性 (0.059%的衰变/周期超过3C的500个周期).
在低温 (-30°C) 和高质量负载 (6.5 mg cm−2) 时,实现了高硫利用率.

结论:

纳米 heterocrystal 催化剂的合理设计范式被介绍.
Co/NbC@NC催化剂有效地抑制了LiPS的转移,并促进了Li-S的转化.
这项工作为开发高级Li-S电池的高性能纳米异晶催化剂铺平了道路.

关键词:

这种电池是LiS电池.在d频段中部,d频段中心.纳米异晶催化剂的催化剂反应动力学反应动力学反应性描述器的反应性描述器.

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