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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Investigation on 3-dimensional carbon foams/LiFePO_4 composites as function of the annealing time under inert atmosphere
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Investigation on 3-dimensional carbon foams/LiFePO_4 composites as function of the annealing time under inert atmosphere

机译:惰性气氛下三维碳泡沫/ LiFePO_4复合材料的退火时间研究

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摘要

The morphological and electrochemical investigation of 3-dimensional (3D) carbon foams coated with olivine structured lithium iron phosphate as function of the annealing time under nitrogen atmosphere is reported. The LiFePO_4 as cathode material for lithium ion batteries was prepared by a Pechini-assisted sol-gel process. The coating has been successfully performed on commercially available 3D-carbon foams by soaking in aqueous solution containing lithium, iron salts and phosphates at 70 °C for 2-4 h. After drying-out, the composites were annealed at 600 °C for different times ranging from 0.4 to 10 h under nitrogen. The formation of the olivine-like structured LiFePO_4 was confirmed by X-ray diffraction analysis performed on the powder prepared under similar conditions. The surface investigation of the prepared composites showed the formation of a homogeneous coating by LiFePO_4 on the foams. The cyclic voltammetry curves of the composites show an enhancement of electrode reaction reversibility by increasing the annealing time. The electrochemical measurements on the composites showed good performances delivering a discharge specific capacity of 85 mAhg~(-1) at a discharging rate of C/25 at room temperature after annealing for 0.4 h and 105 mAh g~(-1) after annealing for 5 h.
机译:报道了在氮气氛下作为退火时间的函数的,涂覆有橄榄石结构的磷酸铁锂的三维(3D)碳泡沫的形态和电化学研究。通过Pechini辅助溶胶凝胶法制备了锂离子电池正极材料LiFePO_4。通过在70°C下将含有锂,铁盐和磷酸盐的水溶液浸泡2-4小时,可以成功地在商用3D碳泡沫上进行涂层。干燥后,将复合材料在氮气下于600°C退火0.4至10 h的不同时间。通过对在相似条件下制备的粉末进行X射线衍射分析,证实了橄榄石状结构的LiFePO_4的形成。制备的复合材料的表面研究表明,LiFePO_4在泡沫上形成了均匀的涂层。复合材料的循环伏安曲线通过增加退火时间显示出电极反应可逆性的增强。复合材料的电化学测量结果显示出良好的性能,退火后0.4 h,室温下放电速率为C / 25,放电比容量为85 mAhg〜(-1),退火后为105 mAh g〜(-1)。 5小时

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