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喷雾干燥-碳热还原合成磷酸铁锂

喷雾干燥-碳热还原合成磷酸铁锂

The Preparation and Characterization of LiFe0.98Mn0.02PO4/C by Spray-

drying and Low Temperature Reduction Route

Jia-feng, ZHANG1, a, Bao ZHANG1,b , Xue-yi GUO1,c, He-zhang CHEN1,d,

Jian-long WANG1, Chao SHEN1and Jun-chao ZHENG1

1School of Metallurgical Science and Engineering, Central South University, Changsha 410083,

Hunan, China

acsuzjf@http://doc.xuehai.net,bcsuzb@http://doc.xuehai.net,cxyguo@http://doc.xuehai.net,dcsuzcl@http://doc.xuehai.net

Keywords: LiFePO4/C, Mn doping, Spray-drying , Low temperature reduction

Abstract: The LiFe0.98Mn0.02PO4/C was synthesized by spray-drying and low temperature reduction route using FePO4·2H2O as precursor, which was prepared by a simple co-precipitation method. The LiFe0.98Mn0.02PO4/C sample was characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical measurements. The XRD analysis and SEM images show that sample has the good ordered structure and spherical particle. The charge-discharge tests demonstrate that the powder has the better electrochemical properties, with an initial discharge capacity of 162.1 mAh·g 1 and 155.8 mAh·g 1 at current density of 0.1 C and 1C, respectively. The capacity retention reaches 99.4% after 100 cycles at 1C.

1 Intorduction

The application of electric vehicles (EVs) and hybrid electric vehicles (HEVs) require the lithium-ion batteries with high energy density and power density, long cycling life, etc. Olivine-type LiFePO4 [1], as a promising cathode material for lithium-ion rechargeable battery, has been extensively studied owing to its environmental friendliness, low costs, and good cycling stability. However, its low-electronic conductivity and low lithium-ion diffusivity within particles [2-3] result in a poor rate capability, and hence prevent it from being applied more widely. Many efforts including metal doping[4-5], coating with the electronically conductive materials like carbon, metal, and metal oxide[6-9], and optimization of particles with suitable preparation procedures[10-11] have been made to improve the performance of LiFePO4 cathode materials.

In this work, LiFe0.98Mn0.02PO4/C sample was prepared using FePO4·2H2O as precursor compound, with which Li2C2O4, MnO2 and sugar as other raw materials. The electrochemical characterization of all the sample was carried out by galvanostatic charge–discharge experiments and cyclic voltammetry. Except to enhance the conductivity and the mean operation voltage, a high capacity was also expected for the LiFePO4-based Li ion batteries.

2 Experimental

The LiFe0.98Mn0.02PO4/C was synthesized by means of spray-drying and low temperature reduction route using FePO4·2H2O as precursor. The FePO4·2H2O precursor was prepared by a simple co-precipitation method, details of which is described as follow: a 0.1 M NH4H2PO4 solution was pumped into a continuous stirred reactor at 60 °C, and 0.1 M FeSO4·7H2O and H2O2(wt.25%) solution was added drop by drop at precipitation pH of 2. The resultant slurry was dried in a blast oven at 120°C for 12 h. Thereafter, the obtained FePO4·2H2O powder was mixed with a stoichiometric amount of Li2C2O4, MnO2, sugar in deionized water according to the carbon contents in the LiFe0.98Mn0.02PO4/C composite about 5%, and then ball milled for 4 h. And then, the mixture were added into a agitation reactor and dried by spray evaporation process. And then, the intermediate product was heat-treated in a horizontal quartz tube from ambient temperature to 600 °C with the heating rate of 5 °C/min and kept at that temperature for 12 h in N2 atmosphere. Eventually, LiFe0.98Mn0.02PO4

喷雾干燥-碳热还原合成磷酸铁锂

/C composite was synthesized.

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