醋酸盐-葡萄糖体系溶液燃烧合成尖晶石型LiMn_2O_4研究

Solution combustion synthesis of LiMn_2O_4 powder by using glucose as fuel in acetate system

以醋酸锂和醋酸锰为原料，葡萄糖为燃料，研究和分析了在550℃溶液燃烧合成尖晶石型LiMn2O4物质的过程、葡萄糖用量对合成LiMn2O4物质的影响，并从热力学的角度探讨了其过程。实验结果表明，仅有醋酸锂和醋酸锰的溶液燃烧合成反应为无焰燃烧，加入燃料后为有焰燃烧；在醋酸盐体系中加入葡萄糖为燃料，燃烧产物LiMn2O4的结晶程度随葡萄糖量增多而逐渐提高，但燃料太多，会使LiMn2O4发生部分热分解。当x（Li）：x（Mn）：x（glucose）=1：2：x，x=1.0-2.0时溶液燃烧合成可得到纯相LiMn2O4物质，x≥3.0得到主晶相为LiMn2O4的产物，x=4.0产物主晶相为贫锂尖晶石Li1-xMn2O4。

Spinel LiMn2O4 powders were prepared by solution combustion synthesis using MnAc2 and LiAc as raw materials,and glucose as fuel.The procedure,effect of glucose content,and thermodynamics of combustion were studied at 550℃.Results showed that it was a flameless combustion without any fuels,but became an open-flame combustion with the addition of fuels.The crystallinity of LiMn2O4 increased with glucose content increasing,but LiMn2O4 decomposed when fuel content was too much.Using the molar ratio of x（Li）：x（Mn）：x（glucose）=1：2：x,phase composition was single-phase LiMn2O4 when x=1.0-2.0,which became LiMn2O4 as main phase when x≥3.0,and Li1-xMn2O4 as main phase when x=4.0.