CoS/CNTs hybrid structure for improved performance lithium ion battery

• Published in: Journal of alloys and compounds 2016-08, Vol.676, p.551-556
• Main Authors: Wang, Huijun, Ma, Jingjing, Liu, Sheng, Nie, Longying, Chai, Yaqin, Yang, Xia, Yuan, Ruo
• Format: Article
• Language: English
• Subjects: CNTs; CoS; Hybrid structure; Lithium ion battery; Solvothermal
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2016.03.132

Cobalt sulfide (CoS) has a high theoretical capacity as an anode materials for lithium ion batteries (LIBs), however it suffers from poor cyclability and weak retention. Therefore, a lot of efforts have been devoted to overcome these defects. In this work, cobalt sulfide/carbon nanotubes (CoS/CNTs) nanocomposites were prepared by a simple and effective solvothermal method. The nanocomposites were constructed by CoS nanoparticles coated on the carbon nanotubes and the electrochemical performances of the CoS/CNTs nanocomposites were investigated as anode materials for LIBs. The results showed that the materials had superior cycle stability and kept a high discharge capacity of 780 mAh g−1 after 50 cycles at the current density of 100 mA g−1. The excellent electrochemical performances are due to the good combination of the hybrid structure and better electron transportation originated from CNTs. The CoS/CNTs nanocomposites with excellent rate capabilities and super capabilities could be promising anode material for lithium ion battery. •CoS/CNTs nanocomposites were prepared by a simple and effective solvothermal method.•Compared with pristine CoS, CoS/CNTs nanocomposites had superior cycle stability.•CoS/CNTs nanocomposites kept a high discharge capacity of 780 mAh g−1 after 50 cycles at 100 mA g−1.