Abstract
A series of nitrogen-doped carbon coating Li2FeSiO4-C (LFS-NCs) nanocrystalline was manufactured by using dicyandiamide as the nitrogen source. The introduction of nitrogen did not cause structural changes. However, it slightly decreases the average particle size and increases the lithium ion diffusion coefficients which benefit its electrochemical performance, especially at low discharge current density. Also, the enhanced electronic conductivity took positive effect in improving the electrochemical performance, especially at relative higher current density. Sample with nitrogen content of 0.55 wt.% shows the best electrochemical performance, with high capacity of 293.4 mAh g−1 at 0.1 C, corresponding to 1.77 reversible Li+ extraction/insertion per molecular. At 0.2 C after 50 cycles, the capacity stabled at 172.7 mAh g−1, showing excellent cyclic performance.
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Funding
This work was supported by Natural Science Foundations of China (No. 21703152, 21801136), and the Natural Science Foundations of Tianjin (No. 19JCQNJC02000, No. 18JCTPJC61200, and No. 18JCYBJC89100), the Foundation of Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) in Nankai University, and the Open Fund of Fujian Provincial Key Laboratory of Eco-Industrial Green Technology (No. WYKF2019-4).
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Gao, H., Deng, X., Wu, Q. et al. Improved capacity and cycling stability of Li2FeSiO4 nanocrystalline induced by nitrogen-doped carbon coating. J Solid State Electrochem 25, 1679–1689 (2021). https://doi.org/10.1007/s10008-021-04940-y
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DOI: https://doi.org/10.1007/s10008-021-04940-y