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矿冶:2020,(4):-
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黄铵铁矾的制备及其形貌对锂离子电池磷酸铁锂正极材料性能的影响
梁栋1, 常龙娇1, 刘佳囡1, 翟玉春2
(1.渤海大学;2.东北大学)
Effect of the preparation and morphology of ammonium jarosite on the properties of lithium iron phosphate anode materials for lithium ion batteries
liangdong1, Chang Longjiao1, liujianan1, zhaiyuchun2
(1.BOHAI University;2.Northeastern University)
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投稿时间:2019-12-31    修订日期:2020-02-14
中文摘要: 为探索出红土镍矿杂质Fe高附加值利用的研究,以红土镍矿的硫酸铵焙烧熟料溶出液作为研究对象,以NH4HCO3作为造矾剂制备黄铵铁矾,矾水解后获得锂离子电池正极材料LiFePO4的原料Fe2O3,Fe2O3中加入Li2CO3、磷酸二氢铵NH4H2PO4及蔗糖煅烧制备出锂离子电池正极材料LiFePO4/C。获得最佳造矾条件为:反应时间4 h、反应温度95℃、终点pH值2.5、搅拌速度400 r/min,除铁率在98.35%以上,并采用XRD、SEM和化学分析手段对黄铵铁矾进行了表征;煅烧温度750℃、煅烧时间10 h制备的片状磷酸铁锂在0.1C倍率下的首次放电比容量164.12 mAh/g,0.1C、0.5C、1C、2C、5C倍率下循环10周的容量保持率较颗粒状磷酸铁锂高,表明片状磷酸铁锂有较好的电化学性能。由红土镍矿中的铁元素合成了高附加值锂离子电池LiFePO4正极材料,为红土镍矿资源高效、综合利用提供新技术及理论支持。
中文关键词: 红土镍矿  黄铵铁矾  磷酸铁锂
Abstract:To explore laterite nickel ore impurities Fe high value-added utilization of research, with laterite nickel ammonium sulfate roasting clinker dissolution liquid as the research object, the NH4HCO3 made alum used to preparation of yellow ammonium iron vitriol, alum hydrolysis of LiFePO4 raw materials for lithium ion batteries battery anode materials Fe2O3, adding Li2CO3 Fe2O3, ammonium dihydrogen phosphate NH4H2PO4 and lithium ion battery anode material sucrose calcined LiFePO4 / C. The best conditions were as follows: reaction time 4 h, reaction temperature 95℃, pH 2.5 at the end point, stirring speed 400 r/min, iron removal rate above 98.35%, and XRD, SEM and chemical analysis were used to characterize ammonium jarosite. The first discharge specific capacity of lithium iron phosphate flake was 164.12mah /g at the calcination temperature of 750℃ and the calcination time of 10h. The capacity retention rate of lithium iron phosphate flake for 10 weeks at the calcination rate of 0.1c, 0.5c, 1C, 2C and 5C was higher than that of lithium iron phosphate granular for 10 weeks, indicating that lithium iron phosphate flake had better electrochemical performance. The high value-added lithium ion battery LiFePO4 anode material is synthesized from iron in laterite nickel ore, which provides new technology and theoretical support for the efficient and comprehensive utilization of laterite nickel ore resources.
文章编号:     中图分类号:TF802.1    文献标志码:
基金项目:基金名称:国家自然基金(51804035),辽宁省科技厅项目(2019-ZD-0507;2170520067)
引用文本:
梁栋,常龙娇,刘佳囡,翟玉春.黄铵铁矾的制备及其形貌对锂离子电池磷酸铁锂正极材料性能的影响[J].矿冶,2020,(4):.

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