水热-离子交换法制备m-LiMnO_2及工艺优化

Hydrothermal-ion exchange preparation of monoclinic layered LiMnO_2 and commercial optimization

单斜层状m-Li Mn O2,合成方法单一且苛刻。为降低其成本及合成复杂性,以Na Mn O2为研究对象,用高温固相法将Mn2O3和无水Na2CO3合成α-Na Mn O2,在此研究钠与锰的浓度不同、煅烧温度不同、保温时间不同、有无碳粉保护的不同对α-Na Mn O2结构的影响。以得到的α-Na Mn O2为前驱体探究通过水热-离子交换法在不同条件下得到m-Li Mn O2,并对水热-离子交换法进行优化探索,效果优于目前的回流蒸馏法。

Monoclinic layered LiMnO2, with unitary and relatively harsh synthetic conditions, therefore, the purpose was to reduce the complexity of synthetic and costing. NaMnO2 as the research object, the high temperature solid state method to synthesize Mn2O3 and anhydrous Na2CO3 was used. The different concentration of sodium and manganese, calcination temperature, holding time, and the presence of carbon powder to protect the influence of different structure of α-NaMnO2 were investigated. Moreover, the α-NaMnO2 as the precursor to explore through hydrothermal-ion exchange process under different conditions for the monoclinic layered LiMnO2 was studied, and optimized the hydrothermal-ion exchange method to good commercial process result in the effect was better than that of reflux distillation method.