Vanadium Nitride Nanowire Supported SnS2 Nanosheets with High Reversible Capacity as Anode Material for Lithium Ion Batteries

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• 作者：Muhammad-Sadeeq Balogun ; Weitao Qiu ; Junhua Jian ; Yongchao Huang ; Yang Luo ; Hao Yang ; Chaolun Liang ; Xihong Lu ; Yexiang Tong
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 21, 2015
• 年：2015
• 卷：7
• 期：41
• 页码：23205-23215
• 全文大小：639K
• ISSN：1944-8252

文摘

The vulnerable restacking problem of tin disulfide (SnS₂) usually leads to poor initial reversible capacity and poor cyclic stability, which hinders its practical application as lithium ion battery anode (LIB). In this work, we demonstrated an effective strategy to improve the first reversible capacity and lithium storage properties of SnS₂ by growing SnS₂ nanosheets on porous flexible vanadium nitride (VN) substrates. When evaluating lithium-storage properties, the three-dimensional (3D) porous VN coated SnS₂ nanosheets (denoted as CC-VN@SnS₂) yield a high reversible capacity of 75% with high specific capacity of about 819 mAh g^鈥? at a current density of 0.65 A g^鈥?. Remarkable cyclic stability capacity of 791 mAh g^鈥? after 100 cycles with excellent capacity retention of 97% was also achieved. Furthermore, discharge capacity as high as 349 mAh g^鈥? is still retained after 70 cycles even at a elevated current density of 13 A g^鈥?. The excellent performance was due to the conductive flexible VN substrate support, which provides short Li-ion and electron pathways, accommodates large volume variation, contributes to the capacity, and provides mechanical stability, which allows the electrode to maintain its structural stability.