化学
循环伏安法
扩散
阴极
钠
电阻率和电导率
分析化学(期刊)
电导率
滴定法
钠离子电池
离子电导率
碳纤维
无机化学
电化学
离子
电极
物理化学
电解质
材料科学
色谱法
有机化学
复合材料
物理
法拉第效率
复合数
电气工程
热力学
工程类
作者
Xiaotong Cong,Tailin Wang,Jianxing Shen,Pan Chen,Hongyan Yao,Zizhao Wang
出处
期刊:Inorganic Chemistry
[American Chemical Society]
日期:2020-06-22
卷期号:59 (13): 9252-9260
被引量:19
标识
DOI:10.1021/acs.inorgchem.0c01129
摘要
Sodium super ionic conductor (NASICON) Na3V2(PO4)3 (NVP) is a type of promising cathode material for sodium-ion batteries (SIBs) with superior structural integrity, high energy density, and fast diffusion of sodium ions. However, NVP suffers from intrinsically low electrical conductivity, which results in poor rate performance. Herein, we report on the outstanding cathode performance of Na3V2(PO4)3 (NVP@C-ZIF67) wrapped by the ZIF-67-derived carbon, which was prepared by sol–gel method and solid-phase method. Electrochemical measurements show an initial discharge-specific capacity of 135 mA h g–1 at 1 C, and the discharge capacity maintains 82 mA h g–1 after 1000 cycles at 10 C. The results indicate the improvement in electrical conductivity and electrochemical performance due to the Co doping from ZIF-67. Moreover, we calculate the diffusion coefficient of sodium ions by the cyclic voltammetry (CV, DNa+ = 1.521 × 10–11 and 2.3484 × 10–11 cm2 s–1 for charging and discharging, respectively) and the galvanostatic intermittent titration technique (GITT, DNa+ ranges from 10–11–10–15 cm2 s–1). The exceptional performance is ascribed to the excellent structural stability and outstanding electrical conductivity of NVP modified by porous carbon skeleton and ZIF-67-derived carbon.
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