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棒状尖晶石型LiMn2O4材料的合成及其性能研究 预览

Performance of Rodlike Spinel Li Mn2O4 Material Preprared with Urchin-like β-MnO2Precursor
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摘要 以MnSO4·H2O与NaClO3为原料,NH_4F为辅助剂,通过水热法合成了海胆状β-MnO2前驱体,研究了NH4F用量对前驱体形貌的影响。以形貌最优的β-MnO2作为前驱体与LiOH·H_2O通过高温烧结合成棒状尖晶石型LiMn2O4,并将它与商业MnO2为前驱体合成的尖晶石型LiMn2O4进行了结构和性能比较。通过X射线衍射分析(XRD)、扫描电镜(SEM)以及电化学性能测试等手段对MnO2前驱体以及尖晶石型LiMn2O4产物进行了表征。实验结果表明,棒状LiMn2O4具有更优越的电化学性能:0.2C下首次放电比容量为119.8 m Ah/g,最高达到123.2 m Ah/g,30圈循环后,容量保持率为94.07%。 Urchin-like β-MnO_2 was prepared by a hydrothermal method via a redox reaction between NaClO_3 and MnSO_4·H_2O assisted with NH_4F,and the effect of NH_4F dosage on the morphology of β-MnO_2 was studied. Usingβ-MnO_2 with the best morphology as the precursor,rodlike spinel LiMn2O4 was synthesized by sintering of the precursor with LiOH·H_2 O,and its structure and performance were evaluated by comparing with spinel Li Mn2O4 prepared with commercial MnO_2 as the precursor. X-ray diffraction( XRD),scanning electron microscopy( SEM) and electrochemical performance test were used to characterize MnO_2 precursors and LiMn_2O_4 products. The results show that,rodlike LiMn_2O_4 exhibits superior electrochemical properties,with the initial and the highest discharge capacity in 0. 2C reaching119.8 m Ah / g and 123.2 m Ah / g,respectively,and capacity retention ratio remaining to be 94.07% after 30 cycles.
作者 胡婷婷 HU Ting-ting (School of Materials Science and Engineering, Central South University, Changsha 410083, Hunan, China)
出处 《矿冶工程》 CAS CSCD 北大核心 2015年第6期145-148,共4页 Mining and Metallurgical Engineering
关键词 锂离子电池 正极材料 尖晶石型LIMN2O4 β-MnO_2 水热法 Li-ion battery cathode material spinel LiMn2O4 β-MnO2 hydrothermal method
作者简介 胡婷婷(1990-),女,安徽安庆人,硕士,研究方向为锂离子电池正极材料。
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