Double-layer carbon protected CoS2 nanoparticles as an advanced anode for sodium-ion batteries. Issue 70 (11th December 2019)

• Record Type: Journal Article
• Authors: Yao, Xiang; Cheng, Hui; Huang, Yuping; Jiang, Zhouyang; Han, Qingyue; Wang, Suqing
• Is Part Of: RSC advances. Volume 9:Issue 70(2019)
• Page Start: 40956
• Page End: 40960
• Publication Date: 2019-12-11
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra08558k
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : The outstanding electrochemical performance is ascribed to the novel structure design of CoS2 @GC@B-CNT. Abstract : Cobalt disulfides with high theoretical capacity are regarded as appropriate anode materials for sodium ion batteries (SIBs), but their intrinsically low conductivity and large volume expansion lead to a poor electrochemical performance. In this work, graphitic carbon coated CoS2 nanoparticles are encapsulated in bamboo-like carbon nanotubes by pyrolysis and sulfidation process. Graphitic carbon can improve the electrical conductivity and prevent the agglomeration of CoS2 nanoparticles. Meanwhile, bamboo-like carbon nanotubes can serve as conductive skeleton frames to provide rapid and constant transport pathways for electrons and offer void space to buffer the volume change of CoS2 nanoparticles. The advanced anode material exhibits a long-term capacity of 432.6 mA h g −1 at 5 A g −1 after 900 cycles and a rate capability of 419.6 mA h g −1 even at 10 A g −1 in the carbonate ester-based electrolyte. This avenue can be applicable for preparing other metal sulfide/carbon anode materials for sodium-ion batteries.