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首页> 外文期刊>International Journal of Electrochemical Science >An optimized Mn-doped LiFePO4/C Composite Synthesized by Carbonthermal Reduction Technique
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An optimized Mn-doped LiFePO4/C Composite Synthesized by Carbonthermal Reduction Technique

机译：碳热还原法合成优化的Mn掺杂LiFePO 4 / C复合材料

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摘要

Mn-doped LiFePO4/C cathode materials were synthesized by a carbothermal reduction technique usingsucrose as both the reduction agent and the carbon source. The microstructure and electrochemicalperformance were systematically investigated by X-ray diffraction (XRD), scanning electronmicroscopy (SEM), Raman spectroscopy, charge-discharge cycling, cyclic voltammograms andelectrochemical impedance spectroscopy. It is found that the all as-prepared composites have a single2+ phase of orthorhombic olivine-type structure and Mn has successfully introduced into the M2(Fe)sites. Among the as-prepared comosites, LiFe0.98Mn0.02PO4/C demonstrates a best electrochemicalproperty in terms of discharge capacity, electrochemical reversibility and cycling performance with an-1 initial discharge capacity of 165 mAhg at a discharge rate of 0.2C. The improved electrochemicalperformance should be attributed to the smaller particle, the enhancement of the P-O bond and the+ 2+ facilitation of Li ion 渆ffectivediffusion induced by Mn -substitution.
机译：通过碳热还原技术，使用蔗糖作为还原剂和碳源，合成了掺锰的LiFePO4 / C正极材料。通过X射线衍射（XRD），扫描电子显微镜（SEM），拉曼光谱，充放电循环，循环伏安图和电化学阻抗谱系统地研究了其微观结构和电化学性能。发现所有制备的复合材料均具有正交的橄榄石型结构的单一2+相，并且Mn已成功引入M2（Fe）位。在制备的复合物中，LiFe0.98Mn0.02PO4 / C在放电容量，电化学可逆性和循环性能方面表现出最佳的电化学性能，在0.2C的放电速率下其初始放电容量为165 mAhg。电化学性能的提高应归因于较小的颗粒，P-O键的增强以及Mn取代引起的Li离子有效扩散的+ 2+促进作用。

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