X射线光电子能谱
材料科学
化学工程
多孔性
碳纤维
无定形碳
插层(化学)
无定形固体
复合数
复合材料
化学
有机化学
工程类
作者
Jiahao Li,Yanjun Chen,Shengnan He,Yaxiong Yang,Chao Zheng,Yanzhong Wang,Li Guo
标识
DOI:10.1016/j.jcis.2023.07.113
摘要
Low electronic conductivity and poor properties at high rate have hindered the application of Na3V2(PO4)3 (NVP). Herein, a facile synthesis of NVP with porous carbon skeleton is proposed. Specifically, Na2CO3 and glucose, acting as hard templates, are introduced to the precursors after initial firing stage, and Na2CO3 particles are removed by flushing after the final heatment. Due to the thermal conductivity of Na2CO3, the secondary addition of glucose can generate distinctive graphitized porous carbon skeleton, which bonds well with the amorphous carbon coating to construct stable and conductive network. The porous construction can alleviate the stress and strain caused by the current impact through deformation. Furthermore, ex-situ EIS reveals the highly conductive carbon skeleton can significantly reduce the surface resistance and result in an increase of effective voltage to promote the de-intercalation of Na+. Moreover, the ex-situ X-ray photoelectron spectroscopy (XPS) at different potentials confirms the stabilized existence of VOC bonds. Benefiting from the unique carbon skeleton, the PC-NVP releases capacity of 116.9 mAh g-1 at 0.1C. Even at 120C, PC-NVP still exhibits a high capacity of 84.7 mAh g-1, retaining a value of 41.3 mAh g-1 after 16,000 cycles, corresponding to a low decay rate of 0.0032% per cycle.
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