1. Effects of calcination temperature on electrochemical properties of cathode material Na4MnV(PO4)3/C synthesized by sol-gel method for sodium-ion batteries.
- Author
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Cheng, Siqi, Li, Wenna, Xiao, Shunhua, Zheng, Shuai, Chen, Zhuo, Hu, Lizhen, Zhu, Qing, Huang, Bin, Liu, Qingquan, and Chen, Quanqi
- Subjects
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CALCINATION (Heat treatment) , *SOL-gel processes , *ELECTROCHEMICAL electrodes , *TEMPERATURE effect , *SODIUM ions , *MECHANICAL properties of condensed matter , *TRANSMISSION electron microscopy - Abstract
The effects of calcination temperature on the physical and electrochemical performance of the Na 4 MnV(PO 4) 3 /C composites, which are prepared by a sol-gel method combined with the subsequent calcination in inert atmosphere, are reported in this work. The Na 4 MnV(PO 4) 3 /C composites are investigated by x-ray diffraction (XRD), N 2 adsorption/desorption isothermal, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and electrochemical measurements. The specific surface area, disorder of carbon, diffusion coefficients of Na+ (D Na) and electrochemical performance of Na 4 MnV(PO 4) 3 /C composites are greatly influenced by the calcination temperature. The surface area and disorder of carbon of Na 4 MnV(PO 4) 3 /C substantially decrease with the calcination temperature increasing. While the D Na and electrochemical performance of Na 4 MnV(PO 4) 3 /C composites improve with the calcination temperature from 650 to 750 °C and then degrade with the calcination temperatures from 750 to 850 °C. The results reveal that the optimal calcination temperature for the Na 4 MnV(PO 4) 3 /C composites is 750 °C and the corresponding Na 4 MnV(PO 4) 3 /C composite possesses the highest capacity and the best rate capability and cyclability amongst all these Na 4 MnV(PO 4) 3 /C composites in this work. • Na 4 MnV(PO 4) 3 /C (NMVP/C) was prepared by sol-gel route plus calcination in N 2 stream. • Calcination temperature impacts on physical and electrochemical properties of NMVP/C. • The optimal calcination temperature is 750 °C in the range of 650–850 °C. • The optimal NMVP/C has higher capacity and better rate capability and cyclability. • The optimal NMVP/C has discharge capacity of 108 mAh/g (0.2C) and 81.3 mAh/g (20C). [ABSTRACT FROM AUTHOR]
- Published
- 2021
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