材料科学
碳纳米管
石墨烯
离子
钠
电化学
阴极
纳米技术
电极
透射电子显微镜
储能
碳纤维
化学工程
复合材料
冶金
复合数
有机化学
物理化学
化学
功率(物理)
工程类
物理
量子力学
作者
Jiangling Luo,Lianyi Shao,Lu Yu,Xiaoyan Shi,Junling Xu,Jianchao Sun,Lifeng Hang,Yanxue Wu,Zhipeng Sun
标识
DOI:10.1016/j.mtphys.2023.101099
摘要
Sodium-ion batteries (SIBs) have attracted much focus as electrochemical energy storage devices with unlimited potential for upcoming large-scale energy storage applications. Nevertheless, sodium ions with large radius and high mass can hinder sodium ions from diffusing into the electrode material, resulting in poor energy/power density and cycling stability. Therefore, a highly conductive three-dimensional carbon network composed of V5Se8 with a self-intercalated layer structure and one-dimensional multi-walled carbon nanotubes (MWCNTs) has been prepared using a straightforward one-step selenization process. This three-dimensional structure can increase the reversible sodium ion storage capacity and structural stability during the cycling process. The obtained V5Se8/MWCNTs electrodes have outstanding rate capacity (250 mAh g−1 at 10 A g−1) and tremendous initial reversible capacity (353 mAh g−1 at 0.2 A g−1). After 1000 cycles, they also obtain adequate cycling stability (323 mAh g−1 at 2 A g−1). The reaction mechanism of V5Se8/MWCNTs electrode in SIBs has been studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM) methods, demonstrating that this electrode experiences a reversible phase transition between V5Se8 and V throughout the Na + insertion/extraction procedures. The full cell can offer a discharge plateau of 2.02 V when coupled with a Na3V2(PO4)2F3@reduced graphene oxide cathode. It also has an excellent discharge capacity of 177 mAh g−1 at 0.1 A g−1 and good cycling stability of 79 mAh g−1 after 1000 cycles at 1 A g−1.
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