磷酸铁前驱体纳米孔洞结构对磷酸铁锂电性能的影响  

Effect of nano porous structure of iron phosphate precursor on electrical property of lithium iron phosphate

作　　者：柯翔[1] 肖仁贵[1] 廖霞[1] 赵曼[1] 马志鸣 

机构地区：[1]贵州大学化学与化工学院,贵州贵阳550025

出　　处：《现代化工》2017年第11期119-123,共5页Modern Chemical Industry

基　　金：贵州省科技厅工业攻关项目(黔科合GY字[2012]3024)

摘　　要：利用液相结晶法制备出球状且表面具有纳米孔洞结构的磷酸铁前驱体,并通过高温固相法进一步制备成磷酸铁锂,通过XRD、SEM、FT-IR和电化学测试等手段对样品进行表征。结果表明,有纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂比无纳米孔洞结构的磷酸铁前驱体制备的磷酸铁锂在0.1 C倍率性能下的首次充放电容量提升了17%,达到149.38 m Ah/g,电极电荷转移电阻降低了约88%,仅为54.91Ω。Spherical iron phosphate precursors with nano porous structure on surface are prepared by liquid phase crystallization method and further made into lithium iron phosphate via high temperature solid phase method.The prepared samples are characterized by XRD,SEM,FT-IR and electrochemical tests. The results indicate that the initial charge/discharge capacity of the Li Fe PO4 that is made from iron phosphate precursors with nano pore structure reaches 149. 38 m Ah·g-1 at 0. 1 C magnification performance,an increase of 17% than that of the Li Fe PO4 that is made from iron phosphate precursors without nano pore structure. The electrode charge transfer resistance also reduces about 88%,to54. 91 Ω only.

关 键 词：液相结晶法 多孔磷酸铁 磷酸铁锂 电化学性能 

分 类 号：TM911[电气工程—电力电子与电力传动]