Nickel Disulfide–Graphene Nanosheets Composites with Improved Electrochemical Performance for Sodium Ion Battery

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• 作者：Tianshi Wang ; Pu Hu ; Chuanjian Zhang ; Huiping Du ; Zhonghua Zhang ; Xiaogang Wang ; Shougang Chen ; Junwei Xiong ; Guanglei Cui
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 30, 2016
• 年：2016
• 卷：8
• 期：12
• 页码：7811-7817
• 全文大小：439K
• ISSN：1944-8252

文摘

Nickel disulfide–graphene nanosheets (NiS₂-GNS) composites were successfully synthesized via a simple and mild hydrothermal method. It was revealed by scanning electron microscopy and transmission electron microscopy images that the spherical NiS₂ nanoparticles with a diameter of 200–300 nm were uniformly dispersed on graphene nanosheets. Na⁺ electrochemical storage properties including cycling performance and high-rate capability of NiS₂-GNS composites were investigated, demonstrating a superior reversible capacity of 407 mAh g^–1 with the capacity retention of 77% over 200 cycles at a current density of 0.1 C. Furthermore, even at a large current density of 2 C, a high capacity of 168 mAh g^–1 can still remain, which is much higher than that of pristine NiS₂ materials. The enhancement in electrochemical properties might be attributed to the synergetic effect endowed by high conductivity of graphene and novel structure of the electrode material. Combined with the advantages of low cost and environmental benignity, NiS₂-GNS composite would be a potential anode material for sodium ion batteries.