Enhanced stability performance of nickel nanowire with 3D conducting network for planar sodium-nickel chloride batteries

JOURNAL OF POWER SOURCES

卷:360

Article

Wu, Tian¹  Zhang, Sanpei¹  Ao, Xin¹  Wu, Xiangwei¹  Yang, Jianhua¹  Wen, Zhaoyin¹ 

[1] Chinese Acad Sci, Shanghai Inst Ceram, CAS Key Lab Mat Energy Convers, Shanghai 200050, Peoples R China

关键词: Sodium-nickel chloride battery;    Ni nanowires;    Magnetic materials;    Discharge capacity;   

DOI  :  10.1016/j.jpowsour.2017.06.015

来源: Elsevier

【 摘 要 】

High temperature sodium batteries with inorganic electrolytes are attracting increasing attention due to their high thermal stability, reliability, long-cycle life and safety. Despite the intensive investigation of Na-NiCl2 batteries during last decades, designing a stable conducting network in the cathode is still challenging but desirable. In this work, a new cathode structure composed of Ni nanowires with an effective electron conducting network is proposed for planar sodium-nickel chloride batteries. During the first stage of charge, Ni nanowires reacted with Cl ion to form NiCl2 on the surface and the excessive Ni nanowires inside can serve as conducting framework to facilitate the fast electron transport. As expected, the metal nanowires show a high specific capacity of 130 mA h g(-1) (similar to 14 mAh cm(-2)) at 0.05 C after 100 cycles. Meanwhile, the batteries show stable cycling performance at 0.05 C with a high cut-off energy density of 360 W h kg(-1), much higher than the traditional tubular sodium-nickel chloride batteries (similar to 100 Wh kg(-1)). Scanning electron microscope (SEM) images of the cathode after long cycling reveal the ultra-slow growth of Ni particles, confirming the excellent stability of the prepared nanowires cathode. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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