Mesoporous γ-Fe2O3: Synthesis, structure, magnetic and electrochemical properties

International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014) Pub Date : 2014-05-26 DOI:10.1109/OMEE.2014.6912348

V. Kotsyubynsky, B. Ostafiychuk, V. Moklyak, A. Grubiak

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Abstract

Mesoporous maghemite γ-Fe2O3 was obtained by thermal decomposition of iron citrate xerogel hydrate. The influence of precursor molar concentration and calcination temperature on the material phase composition, morphology, crystalline and magnetic microstructure, surface condition and optical properties was studied. The model of mesoporous γ-Fe2O3 formation is proposed. Obtained γ-Fe2O3 was tested as cathode material for lithium power sources. Increase of lithium power sources specific capacity and energy with the samples specific surface area enlarging is fixed. Specific energy is 180-200 W·h/kg at the discharge rate 1.0 C. Two kinetic processes are observed during discharge processes: lithium accumulation at the cathode material/electrolyte interface and diffusion of lithium ions into the material crystal structure. The diffusion coefficients of lithium in the cathode material on the different stages of discharge process are calculated.

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介孔γ-Fe2O3:合成、结构、磁性和电化学性能

采用柠檬酸铁水凝胶热分解法制备了介孔磁赤铁矿γ-Fe2O3。研究了前驱体摩尔浓度和煅烧温度对材料相组成、形貌、晶磁微观结构、表面形貌和光学性能的影响。提出了介孔γ-Fe2O3形成模型。所得的γ-Fe2O3作为锂电源正极材料进行了测试。锂电源比容量和能量随样品比表面积的增大而增大。放电速率为1.0 c时，比能为180 ~ 200 W·h/kg。放电过程中观察到两个动力学过程:锂离子在正极材料/电解质界面处的积累和锂离子向材料晶体结构中的扩散。计算了正极材料中锂离子在不同放电阶段的扩散系数。

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International Conference on Oxide Materials for Electronic Engineering - fabrication, properties and applications (OMEE-2014)

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