(1. 中南大学 化学化工学院 功能材料化学研究所， 长沙 410083;
2. 湖南农业大学 理学院， 长沙 410128)
摘 要: 以自制γ-MnO2（SPDM）和电解二氧化锰（EDM）为原料， 采用流变相法合成了尖晶石型锂锰氧材料。 应用XRD， SEM， TG和DSC等手段研究了原材料性质和配比等因素对合成尖晶石型锂锰氧的结构、粒径、 比表面积以及充、 放电性能的影响。 结果表明， 采用流变相法在700～760℃下， 反应12h即可得到均相、 无杂质、 锰平均氧化价态接近3.5的LixMn2O4正极材料；以SPDM为锰源较EMD为锰源在相同条件下合成的尖晶石材料的首次充、 放电容量更高， 比表面积更大， 粒度更小；当原材料中n(Li)/n(Mn)在一定范围内变化时， 合成的锂锰氧的晶格常数随材料中锂与锰摩尔比的增大而减小。
关键字: γ-MnO2； 电解二氧化锰； 流变相法； 尖晶石型锂锰氧
（1. Institute of Functional Materials and Chemistry,
Central South University, Changsha 410083, China;
2. Faculty of Science, Agriculture University of Hunan, Changsha 410002, China）
Abstract:Spinel-typed LixMn2O4 compounds were synthesized by rheologic phase reaction using a mixture of LiNO3 and self-prepared γ-MnO2 or electrolytic MnO2 and LiNO3 as raw materials. The effects of reaction conditions such as manganese dioxides used and the molar ratio of LiNO3 to MnO2 in raw materials, on the structures, specific area, charge/discharge capacities and other properties of products were investigated by XRD, SEM, TG and DSC. The results show that a homogeneous LixMn2O4 synthesized form γ-MnO2 has higher specific area caused by small particle diameter and higher charge/discharge capacities than that prepared from EMD. The lattice parameter decreases with the increase of n(Li)/n(Mn) when n(Li)/n(Mn) varies in the range of 0.50-0.55.
Key words: γ-MnO2; elctrolytic MnO2; rheologic phase reaction; spinel-typed LixMn2O4
