NiSe2 Nanooctahedra as an Anode Material for High-Rate and Long-Life Sodium-Ion Battery

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• 作者：Shaohua Zhu ; Qidong Li ; Qiulong Wei ; Ruimin Sun ; Xiaoqing Liu ; Qinyou An ; Liqiang Mai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 11, 2017
• 年：2017
• 卷：9
• 期：1
• 页码：311-316
• 全文大小：482K
• ISSN：1944-8252

文摘

In this article, we report NiSe₂ nanooctahedra as a promising anode material for sodium-ion batteries (SIBs). They exhibit outstanding long-term cyclic stability (313 mAh/g after 4000 cycles at 5 A/g) and excellent high-rate capability (175 mAh/g at 20 A/g). Besides, the initial Coulombic efficiency of NiSe₂ is also very impressive (over 90%). Such remarkable performances are attributed to good conductivity, structural stability, and the pseudocapacitive behavior of the NiSe₂. Furthermore, the sodium ion storage mechanism of NiSe₂ is first investigated by in situ XRD and ex situ XRD. These highlights give NiSe₂ a competitive strength for rechargeable SIBs.