(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 采用固相法合成系列Li-Mn-Ti复合氧化物(理论化学式为LiTixMn2−xO4，0≤x≤1)；利用热重−差示扫描量热法(TG-DSC)、X射线衍射(XRD)和扫描电子显微镜(SEM)等对其结构和形貌进行表征，并通过酸浸实验考察其在弱酸性介质中的稳定性。结果表明：当x≤0.5时，Ti能完全地纳入尖晶石晶格，并使晶胞参数增大、晶粒变小；Li-Mn-Ti复合氧化物酸浸前、后能够保持尖晶石的结构和形貌，具有结构稳定性，但其化学稳定性还有待进一步提高。
关键字: 锂离子筛；Li-Mn-Ti复合氧化物；结构；稳定性；酸介质
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:A series of spinel Li-Mn-Ti composite oxides with theoretical formula as LiTixMn2−xO4 (0≤x≤1) were prepared by solid-state route. The thermogravimetry-differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate their structure and morphology, and the structure and stability in acid medium were conducted as well. The results show that Ti can be brought into the spinel framework completely and form well-crystallized product when x is below 0.5 with the increase of cell parameters and the reduction of the grain size. The Li-Mn-Ti composite oxide can maintain the spinel structure and morphology after acid treatment, whereas its chemical stability should be improved.
Key words: lithium ion sieve; Li-Mn-Ti composite oxides; structure; stability; acid medium
