化工学报2011，Vol.62Issue(11)：3276-3281,6.DOI:10.3969/j.issn.0438-1157.2011.11.043
基于废旧锂离子电池正极材料LiMn2O4制备MnO2及其电化学性能
Synthesis and electrochemical properties of MnO2 nanomaterials from spent LiMn2O4 batteries
摘要
Abstract
λ-MnO2 nanoparticles and β-MnO2 nanorods were successfully prepared from spent LiMn2O4 cathode materials by controlling appropriate leaching conditions in this study. Their electrochemical properties were investigated as electrode materials for primary cells and supercapacitors. The composition, morphology and electrochemical properties of the obtained samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), constant current charge-discharge and cyclic voltammetry measurements. The results indicated that λ-MnCO2 nanoparticles could be prepared at ambient temperature and pressure, with 0. 5 mol · L-1 H2SO4 leaching the spent LiMn2O4 for 3 h, and β-MnO2 nanorods could be synthesized under hydrothermal conditions of 140°C, with 2 mol · L-1 H2SO4 leaching the spent LiMn2O4 for 24 h. The X-MnO2 and β-MnO2 samples delivered discharge capacities of 142 mA · h · g-1 and 275 mA · h · g-1, respectively as electrode materials for Li/MnO2 primary cells, while the commercial β-MnO2 only delivered a discharge capacity of 163 mA·h·g-1. Both of the λ-MnO2 and β -MnO2 samples as electrode materials for supercapacitors exhibited good capacitance property, with specific capacitance of 87. 4 F · g-1 and 85. 7 F · g-1, respectively in 1 mol · L-1 Na2SO4 electrolyte solution, while the commercial β-MnO2 only presented a specific capacitance of 76.1 F·g-1.关键词
废旧LiMn2O4/λ-MnO2/β-MnO2/一次电池/超级电容器Key words
spent LiMn2O4/λ-MnO2/β-MnO2/primary cell/supercapacitor分类
化学化工引用本文复制引用
杨则恒,倪玉龙,梅周盛,王强,张卫新..基于废旧锂离子电池正极材料LiMn2O4制备MnO2及其电化学性能[J].化工学报,2011,62(11):3276-3281,6.基金项目
国家自然科学基金项目(21176054,20871038,20976033) （21176054,20871038,20976033）
安徽省教育厅创新团队项目(TD200702). （TD200702）
