煅烧
结晶度
电化学
材料科学
溶胶凝胶
阴极
复合数
极化(电化学)
分析化学(期刊)
多孔性
核化学
化学工程
电极
复合材料
催化作用
化学
色谱法
纳米技术
物理化学
生物化学
工程类
作者
Shaohua Luo,Jia-yu Li,Shuo Bao,Yingying Liu,Zhiyuan Wang
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2018-01-01
卷期号:165 (7): A1460-A1465
被引量:33
摘要
Na3V2(PO4)3 (NVP) composites were prepared by a facile sol-gel method. The optimal synthetic conditions were systematically investigated by orthogonal test method and single factor of calcination temperature, which had maximum effect on the electrochemical properties of the sample. The optimal Na3V2(PO4)3/C (denoted as Opt-NVP/C) has been prepared under the condition of the calcination temperature at 800°C, the molar ratio of NVP to C as 1:1, sol-gel reaction temperature at 80°C and the calcination time of 16 h. The capacity retention decreased by only 2% from the initial value of 106.7 mAh g−1 to 104.5 mAh g−1 after 100 cycles at 0.2C. Enhanced electrochemical performance can be attributed to reduced polarization and stable operating voltage window. The high purity and crystallinity at the proper calcination temperature and porous particles morphologies are related to lower polarization and higher Na+ diffusion coefficient, respectively.
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