Preparation of High Performance Battery-grade Cathode Material Lithium Iron Phosphate by Freeze-drying Method
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摘要: 以LiOH·H2O为Li源,FeNO3·9H2O为Fe源,NH4H2PO4提供磷酸根,柠檬酸作为碳源和螯合剂进行配料,采用简单的制备工艺冷冻干燥法合成了电池级正极材料磷酸铁锂粉末。通过XRD物相表征、电池充放电和循环伏安等测试手段探究了烧结工艺对碳包覆磷酸铁锂(LiFePO4/C)正极材料的结晶性及电化学性能的影响。结果表明,煅烧温度为750℃时获得的正极材料LiFePO4/C电化学性能表现最好,在不同电流密度下0.1C、0.2C、1C、2C和5C的放电比容量分别为150.5、142.2、128.1、117.8和105.4 mAh/g。Abstract: Lithium iron phosphate powder as battery-grade cathode material was prepared by freeze-drying method respectively using LiOH·H2O as lithium source,FeNO3·9 H2O as iron source,NH4H2PO4 as phosphate source,citric acid as carbon source and chelating agent.The effects of sintering process on crystallinity and electrochemical properties of the carbon-coated lithium iron phosphate（LiFePO4/C） cathode materials were investigated by XRD,charge-discharge test and cyclic voltammetry.The results show that the cathode material（LiFePO4/C） sintered at 750 ℃ presents the best electrochemical performances,with a discharge specific capacity of 150.5,142.2,128.1,117.8 and 105.4 mAh/g at 0.1 C,0.2 C,1 C,2 C and 5 C,respectively.
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