CAJ | 학술논문

以铁粉为铁源,采用硫酸循环辅助法制备锂离子电池正极材料 LiFePO4的前驱体 FePO4。实验结果表明,采用过量硫酸可以促使铁粉与磷酸的完全反应,并且可以在反应体系中循环使用,整个反应体系没有任何废液产生。XRD 和 SEM分析表明,首次合成的FePO4与循环30次后得到的 FePO4其结构、形貌和大小相同。采用不同循环次数合成的 FePO4与计量比的LiOH 和适量蔗糖混合,在5% H2~95% N2气氛中在350℃烧结5h,700℃烧结15h,得到的目标产物LiFePO4/C一致性好,电性能优异,0.2、0.5、1和5C放电容量分别为155.1、144.0、134.4和101.7mAh/g,并且具有优异的倍率和循环性能。
이철분위철원,채용류산순배보조법제비리리자전지정겁재료 LiFePO4적전구체 FePO4。실험결과표명,채용과량류산가이촉사철분여린산적완전반응,병차가이재반응체계중순배사용,정개반응체계몰유임하폐액산생。XRD 화 SEM분석표명,수차합성적FePO4여순배30차후득도적 FePO4기결구、형모화대소상동。채용불동순배차수합성적 FePO4여계량비적LiOH 화괄량자당혼합,재5% H2~95% N2기분중재350℃소결5h,700℃소결15h,득도적목표산물LiFePO4/C일치성호,전성능우이,0.2、0.5、1화5C방전용량분별위155.1、144.0、134.4화101.7mAh/g,병차구유우이적배솔화순배성능。
In this essay,based on iron powder for iron source,the precursor of LiFePO4 which is the cathode material of lithium ion battery were synthesized by sulfuric acid assisted circulation.The results showed that the excess sulfuric acid could make the reaction of iron powder and phosphate thorough,and it could be used circularly in the system,then the whole system did not produce any waste stream.The results of XRD and SEM indicated that the structure,morphology and size of FePO4 which were composed in the first time or cycle 30 times were the same.The LiFePO4/C composite cathode material was synthesized using self-regulating Fe-PO4 under different cycle times as a precursor,glucose as a C source,and LiOH as a Li source,in a pipe fur-nace under an atmosphere of 5% H2-95% N2 ,followed by sintering in a pipe furnace at 350℃ for 5h,then at 750℃ for 15h.LiFePO4/C displays good consistency and showed excellent electrical performance:at a rate of 0.2,0.5,1,5C ,the discharge capacities were 155.1,144.0,134.4 and 101.7mAh/g,in addition,ouned out-standing ratio and cycle performance.