电纺FeMnO3纳米纤维毛毡的制备及电化学性能研究

本研究以聚乙烯吡咯烷酮(PVP)、九水硝酸铁和四水合醋酸锰为原料, 无水乙醇和N,N-二甲基甲酰胺为溶剂, 配置了均一稳定的前驱体纺丝液, 利用静电纺丝技术制备了PVP/Mn(COOH)₂/Fe(NO₃)₃复合纳米纤维, 高温煅烧后得到了锰酸铁(FeMnO₃)纳米纤维毛毡, 用其作为锂电池负极材料。利用红外光谱(FT-IR)、X射线衍射(XRD)、扫描电镜(SEM)和BET比表面积分析仪等研究样品的表观形貌与晶型结构。结果表明: 煅烧后制得的FeMnO₃纳米纤维毛毡具有良好的形貌结构, 比表面积为9.9 m2/g, 当温度达到470 ℃后, 曲线变得平缓, 热重损失不明显。充放电、循环伏安以及循环性能测试结果表明, FeMnO₃纳米纤维毛毡具有良好的电化学性能及电稳定性, 首次充电比容量为1264 mAh/g, 在50 mA/g电流密度下经过37次循环后其比容量仍保持在533 mAh/g; 在循环50次后, 阻抗约为170 Ω, 基本保持不变。

Electrospun FeMnO3 Nanofibrous Mats: Preparation and Electrochemical Property

A uniform and stable precursor spinning solution was prepared by using polyvinylpyrrolidone (PVP), ferric nitrate nonahydrate and manganese acetate tetrahydrate as raw materials, anhydrous ethanol and N,N-dimethylformamide as solvent, followed by magnetically stirred. The PVP/Mn(COOH)₂/Fe(NO₃)₃ composite nanofibers were prepared by electrospinning technology. FeMnO₃ nanofibrous mats were obtained after high temperature calcination, which was used as anode material for lithium battery. Apparent morphology and crystal structure of the samples were investigated by FT-IR, XRD, SEM, and BET specific surface area analyzers. All results showed that the fabricated FeMnO₃ nanofibrous mats possessed good structural morphology with the specific surface area of 9.9 m ²/g. TG analysis showed that when temperature reaches 470 ℃, the TG curve becomes gentle while the mass loss is not obvious. Results form charge and discharge, cyclic voltammetry, and cycle performance tests, indicated that FeMnO₃ nanofibrous mats had good electrochemical performance and electrical stability, with a specific capacity of 533 mAh/g at 50 mA/g after 37 cycles. After 50 cycles, the impedance is approximately 170 Ω, which remains essentially unchanged.