| 喷雾热解法制备超细MnO2及其电化学性能 |
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| 引用本文： | 赵峰鸣,马淳安,童少平,褚有群.喷雾热解法制备超细MnO2及其电化学性能[J].化工学报,2005,56(5):925-931. |
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| 作者姓名： | 赵峰鸣 马淳安 童少平 褚有群 |
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| 作者单位： | 浙江工业大学绿色化学合成技术国家重点实验室培育基地，纳米科学与技术工程研究中心，浙江 杭州 310032 |
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| 基金项目： | 浙江省科技厅重大项目 (021101718)~~ |
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| 摘 要： | 采用喷雾热解法制备了超细MnO2阴极材料，并利用XRD、SEM和电化学测试方法研究了MnO2的相组成、形貌、电化学性能以及在碱性溶液中的阴极极化行为.实验结果表明，喷雾干燥后的样品呈球形，表面有裂纹，经热处理后产物为Mn2O3，此时颗粒表面碎裂，形成多孔材料，酸处理后得到γ-MnO2，含量超过90％.与EMD（电解二氧化锰）相比，所制备样品的放电容量（截止电压1.0V vs Zn）为215mAh·g-1，放电深度可达一电子理论容量的70％，比EMD提高了15％;结合稳态极化和电化学阻抗法，发现质子在MnO2晶格中的扩散符合多孔电极的阻挡层扩散模型，由等效电路拟合得到的数据能够较好地解释实验现象，反映了质子固相扩散的真实情况.
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| 关 键 词： | 喷雾热解法 超细二氧化锰 电化学性能 电化学阻抗 |
| 文章编号： | 0438-1157(2005)05-0925-07 |
| 收稿时间： | 2004-7-2 |
| 修稿时间： | 2004-9-13
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Synthesis of ultrafine MnO2 powders by spray-drying and characterization |
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| Zhao Fengming,Ma Chun'an,Tong Shaoping,CHU Youqun.Synthesis of ultrafine MnO2 powders by spray-drying and characterization[J].Journal of Chemical Industry and Engineering(China),2005,56(5):925-931. |
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| Authors: | Zhao Fengming Ma Chun'an Tong Shaoping CHU Youqun |
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| Abstract: | A spray-drying method was developed to synthesize MnO2 cathode materials and measurements of XRD,SEM and electrochemistry were performed to characterize the properties of the prepared materials.Experimental results showed that Mn2O3 was formed during heat-treating and changed to γ-MnO2 after acid treating.The precursor had the shape of a globe, and then cracked when being sintered.The initial discharge capacity reached 215mAh·g-1 and 70% DOD with respect to the first one-electron reduction of γ-MnO2.It could be higher by 15% than EMD.Combined with cathodic polarization and AC impedance, the finite diffusion model was used to interpret the proton diffusion inside the lattice of MnO2. |
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| Keywords: | spray-drying method ultrafine MnO_2 electrochemical performance AC impedance |
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