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采用喷雾干燥-固相法批量制备出了球形的LFVP/C(Fe位掺杂V的LiFePO4)正极材料。通过SEM、充放电测试等对样品进行了表征;考察了喷雾干燥对产物的形貌及电化学性能的影响。SEM表明喷雾干燥-固相法制备的LFVP为中空微米级球粒,尺寸在5~30μm,颗粒表面、断面及内部分布有许多介于100nm1μm空隙。电化学测试表明:与普通干燥-固相法制备的材料相比,喷雾干燥-固相法制备的LFVP电压平台更稳,倍率性能更好,2 C、5 C放电容量分别可以达到118 Ah/g、94 mAh/g。
Abstract：Mass production of spherical LFVP/C(V was doped in Fe site of LiFePO4) cathode material was achieved by spay drying and solid-state synthesis method(SDSSM).The effects of spaying dry on the morphology and the electrochemical properties of the LFVP were investigated by means of SEM and constant current charge-discharge testing,respectively.The as prepared LFVP/C composite showed morphology of hollow micrometer-sized spheres with particle size between 5 μm and 30 μm.Pores with the size of 0.1 μm to 1 μm were dispersed in the particles homogenously.The electrochemical tests indicated that the LFVP/C composite prepared by SDSSM exhibited more stable plateaus and better discharge capacity of about 118 mAh/g at 2 C and 94 mAh/g at 5 C,when it was compared with that of the LFVP prepared by simple drying method.
[1]Ma J X,Wang C S,Wroblewski S N.Kinetic characteristicsof mixed conductive electrodes for lithium ion batteries[J].JPower Sources,2007,164:849-856.
[2]Song M S,Kang Y M,Kim J H,et al.Simple and fastsynthesis of LiFePO4/C composite for lithium rechargeablebatteries by ball-milling and microwave heating[J].J PowerSources,2007,166:260-265.
[3]赖春艳,赵家吕,解晶莹.用两种碳源制各高性能LiFePO4/C正极材料[J].功能材料与器件学报,2006,12(6):484-488.
[4]Croce F,Epifanio A D,Hassoun J,et a1.A novel concept forthe synthesis of an improved LiFePO4 1ithium battery cathode[J].Electrochem Solid-State Lett,2002,5(3):A47-A50.
[5]Bhuvaneswari M S,Bramnik N N,Ensling D et al.Synthesisand characterization of Carbon Nano Fiber/LiFePO4composites for Li-ion batteries[J].J Power Sources,2008,180:553-560.
[6]Wang D Y,Wang Z X,Huang X J.Continuous solid solutionsLiFe1-xCoxP04 and Its electrochemica1 performance[J].J PowerSources,2005,146:580-583.
[7]Subramanya Herle P,B.Ellis,N.Coombs,et al.Nano-network electronic conduction in iron and nickel olivinephosphates[J].Nature Materials,2004,(3):147-152.
[8]Ou X Q,Liang G C,Wang L et al.Effects of magnesiumdoping on electronic conductivity and electrochemicalproperties of LiFePO4 prepared via hydrothermal route[J].JPower Sources,2008,184:543-547.
[9]Liao X Z,He Y S,Ma Z F,et al.Effects of fluorine-substitution on the electrochemical behavior of LiFePO4/Ccathode materials[J].J Power Sources,2007,174:720-725.
[10]Xu C,Lee J,Teja A S.Continuous hydrothermal synthesis oflithium iron phosphate particles in subcritical andsupercritical water[J].J Supercrit Fluids,2008,44:92-97.
[11]Dominko R,Bele M,Gaberscek M,et al.Porous olivinecomposites synthesized by sol-gel technique[J].J PowerSources,2006,153:274-280.
[12]Yu F,Zhang J J,Yang Y F,et al.Preparation andcharacterization of mesoporous LiFePO4/C microsphere byspray drying assisted template method[J].J Power Sources,2009,189:794-797.
[13]Hu Y S,Guo Y G,R Dominko,et al.Improved electrodeperformance of porous LiFePO4 using RuO2 as an oxidicnanoscale interconnect[J].Adv Mater,2007,19(15):1963-1966.
[14]黄凯兵,肖侠,陈振华,等.喷雾干燥法制备微米-纳米复合结构高吸油树脂中空微球[J].功能材料,2009,(8):1398-1402.
基本信息:
中图分类号:TM912.9
引用信息:
[1]王睿,冯修成,陈果,等.喷雾干燥-固相法制备LFVP/C正极材料[J].电池工业,2011,16(02):89-92.