电化学
材料科学
电池(电)
离子
扩散
阴极
碳纤维
复合数
热稳定性
复合材料
钠离子电池
化学工程
化学
电极
热力学
法拉第效率
物理化学
工程类
功率(物理)
有机化学
物理
作者
Xianda Hong,Xiaobing Huang,Yurong Ren,Haiyan Wang,Xiang Ding,Jun‐Ling Jin
标识
DOI:10.1016/j.jallcom.2019.153587
摘要
Na3V2(PO4)3(NVP) is supposed to be a generation cathode material for sodium-ion batteries due to its unique 3D channel structure and remarkable thermal stability. But its poor electronic conductivity partly impedes their electrochemical performance. Herein, a sequence of Na3V2(PO4)3/C-Ag(NVP/C-Ag) samples were manufactured via a traditional one-step solid-state process to alleviate this problem. The results reveal that NVP/C-Ag-2 sample possesses minimum charge-transfer resistance and maximum ion diffusion coefficient, and thus has satisfactory electrochemical performance, with a capacity of 95 mA h/g at 10C and almost no capacity decay after 500 cycles. Even at 50C, it can reach a reversible specific capacity of 85 mA h/g. The results demonstrate that an appropriate ratio of silver and carbon acting cooperatively on the particles is a valid method to enhance the electrochemical property.
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