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在硫电池中的硫酸盐阴极中,与气替代的石墨烯结

Louisa C Greenburg¹, Xin Gao¹, Pu Zhang¹

¹Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, United States.

|June 23, 2023

概括

单个原子和集群在多孔的石墨支上 (Ni@HGDY) 提高硫电池的性能. 这种催化剂增强了导电性和转换动力学,使下一代储能能能量的容量更高.

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:

硫 (Li-S) 电池具有较高的理论能量密度和较低的硫成本,这使得它们对未来的能源存储具有吸引力.
-S电池的一个主要挑战是隔热硫 (S) 和硫化 (Li2S) 之间的缓慢转换动力学,阻碍了性能.
开发有效的催化剂对于克服这些动力限制和提高Li-S电池效率至关重要.

研究的目的:

开发和评估一种用于提高硫电池性能的新型催化剂.
为了研究 (Ni) 单个原子和集群的催化活性,在替代石墨 (HGDY) 上支持Li-S阴极.
改善离子和电子导电性,并促进Li-S电池中硫种的完全转化.

主要方法:

一种由 (Ni) 单个原子和集群组成的催化剂的合成,这些原子和集群固定在一个多孔的替代石墨支上 (Ni@HGDY).
将Ni@HGDY催化剂纳入Li2S阴极,用于测试Li-S电池电池.
电化学表征,包括在1°C的循环性能,以评估容量保留和效率.

主要成果:

Ni@HGDY催化剂显著提高了Li2S阴极中的离子和电子导电性.
催化剂降低了反应过量的潜力,并促进了Li2S和硫之间的更完整的转换.
使用Ni@HGDY的Li-S阴极实现了超过125个周期在1°C下超过516mAh的容量,而控制器的容量仅超过200mAh.

结论:

(Ni) 证明了作为金属催化剂提高Li-S电池性能的有效性.
用替代的石墨 (HGDY) 支持对先进的储能应用有很大的前景.
Ni@HGDY催化剂有效地解决了Li-S电池中的动力挑战,为高性能储能系统铺平了道路.

关键词:

-S电池电池的使用情况.尼的催化剂是Ni的催化剂.用替代的石墨二烯基被取代了.硫化阴极是的硫化物.

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