纳米 LiFePO4 嵌入有序介孔氮碳复合材料作为锂离子电池正极材料的电化学性能,Journal of Electroanalytical Chemistry

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纳米 LiFePO4 嵌入有序介孔氮碳复合材料作为锂离子电池正极材料的电化学性能
Journal of Electroanalytical Chemistry ( IF 4.1 ) Pub Date : 2019-09-01 , DOI: 10.1016/j.jelechem.2019.113242
Sourav Khan , Rayappan P. Raj , Talla V.R. Mohan , Subramani Bhuvaneswari , Upadhyayula V. Varadaraju , Parasuraman Selvam

摘要我们在此报告了纳米级 LiFePO4 的制备和电化学表征，从 Fe(III) 前驱体开始，嵌入有序介孔含氮碳 (LFP/MNC-31)。为了进行比较，还制备和研究了嵌入无氮有序介孔碳 (LFP/CMK-3) 中的 LFP 纳米颗粒。在电化学测试之前，使用 XRD、FT-Raman、TEM、SEM 和氮吸附研究对这两种复合材料进行了表征。复合材料中碳的有序和介孔性质是通过小角度 XRD 和 BET 等温线确定的。Reitveld 精制的 XRD 数据显示具有良好结晶度的 LFP 单相形成。TEM 研究表明 LFP 纳米颗粒嵌入碳基质的中孔中。半电池模式下的电化学研究（vs. Li+/Li) 表明，与原始 LFP 相比，复合材料中的锂离子扩散系数值明显更高（6-7 个数量级）。此外，与 LFP/CMK-3 相比，LFP/MNC-31 复合材料在比容量、倍率性能和循环稳定性方面表现出相对更好的电化学性能，突出了碳基体中氮掺杂对提高电化学性能的重要性.

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Electrochemical performance of nano-LiFePO4 embedded ordered mesoporous nitrogenous carbon composite as cathode material for Li-ion battery applications

Abstract We report here the preparation and electrochemical characterization of nano-sized LiFePO4, starting from Fe(III) precursor, embedded in ordered mesoporous nitrogenous carbon (LFP/MNC-31). For comparison, LFP nanoparticles embedded in nitrogen-free ordered mesoporous carbon (LFP/CMK-3) was also prepared and studied. Both these composites were characterized using XRD, FT-Raman, TEM, SEM and nitrogen sorption studies prior to electrochemical testing. The ordered and mesoporous nature of the carbon in the composites was established by small-angle XRD and BET isotherms. Reitveld refined XRD data reveals single phase formation of LFP with good crystallinity. TEM studies show that the LFP nanoparticles are embedded in the mesopores of the carbon matrix. Electrochemical studies in half-cell mode (vs. Li+/Li) reveal that the Li-ion diffusion coefficient values in the composites are remarkably higher (6–7 orders of magnitude) compared to pristine LFP. Furthermore, the LFP/MNC-31 composite shows relatively better electrochemical properties in terms of specific capacity, rate capability and cyclic stability vis-a-vis LFP/CMK-3 highlighting the importance of nitrogen doping in the carbon matrix in enhancing the electrochemical performance.

更新日期：2019-09-01

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