LiMn_2O_4的溶液─凝胶─酯化法合成反应机制

Sol-gel Esterification Process for LiMn_2O_4 Preparation

本文以溶胶─凝胶─酯化法合成LiMn2O4尖晶石粉体材料，用FT—IR、TG—DTA以及XRD研究了LiMn2O4的形成机制。整个反应过程可分为凝胶的形成和干凝胶的分解两阶段，前体物在液相中经络合、酯化、聚合而形成凝胶，不同的投料Li／Mn（摩尔比）值使凝胶分解形成LiMn2O4经历不同的反应历程，也使产物具有不同的物相组成。

LiMn2O4 powder is prepared via sol-gel-esterification process. The mechanism of the process is investigated by FT-IR、TG-DTA and XRD techniques. The whole process can be divided into two parts, the formation of xerogel and the decomposition of it. The salts are mixed in solution and changed into xerogel via chelation, esterification and polycondensation. The xerogel with different Li/Mn value can decompose in different ways and lead to different products.