Modification of the Solution Flameless Combustion Synthesis of Spinet LiMn2O4 by Nitric Acid

作者：Xia Yan; Huang Mei; Chen Mimi; Zhang Yingjie; Guo Junming^*

来源：Asian Journal of Chemistry, 2013, 25(4): 1917-1920.

• LiMn2O4
• Nitric acid
• Solution nameless combustion synthesis
• Cathode materials

In present work, the effect of auxiliary oxidant HNO3 with different amounts on structures and properties of spinel LiMn2O4 using lithium nitrite and manganese acetate as raw materials by means of the solution flameless combustion synthesis method has been studied. The phase composition, microscopic morphology and electrochemical properties of the LiMn2O4 were investigated using XRD, SEM and charge-discharge cycling, respectively. The results showed that the main phase of productions obtained was the LiMn2O4 and the impurity phase was greatly affect by the amount of HNO3, for instances, a Mn3O4 impurity phase was detected at low HNO3 amount (below 1.0 for the NO3-/CH3COO- molar ratio), while a Mn2O3 phase was observed at high HNO3 amount (above 1.0 for the NO3-/CH3COO- molar ratio). From their XRD patterns, it can be seen that the diffraction peaks became sharper, with the increasing concentration of HNO3, indicating that the crystalline of LiMn2O4 was forming and their particle size decreased gradually. After adding proper HNO3 into raw compounds, the LiMn2O4 nano-particles were the most uniform. Compared with the direct productions, the nitric acid modified productions possessed bigger capacity and better capacity retention rate. The discharge capacity of the product increased first and then decreased with increasing concentration of nitric acid.

• 出版日期2013-4
• 单位云南民族大学