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.
Synthesis of spinel typed LixMn2O4 and its properties
Abstract:
Spineltyped LixMn2O4 compounds were synthesized by rheologic phase reaction using a mixture of LiNO3 and selfprepared γMnO2 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 γMnO2 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 0.500.55.
Table 1 Some physicochemical data and first charge/discharge capacityfor Li-Mn-O materials obtained from calcining a mixture of SPDM and LiNO3 at 720 ℃ for 12 h
*—EMD was used as raw material
图5 在720 ℃空气中煅烧12 h获得的 LixMn2O4的充放电曲线
Fig.5 Charge/discharge curves (0.3 mA·cm-2) of LixMn2O4 obtained under 720 ℃ for 12 h in air