(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 采用固相法合成系列Li-Mn-Ti復(fù)合氧化物(理論化學(xué)式為L(zhǎng)iTixMn2−xO4，0≤x≤1)；利用熱重−差示掃描量熱法(TG-DSC)、X射線(xiàn)衍射(XRD)和掃描電子顯微鏡(SEM)等對(duì)其結(jié)構(gòu)和形貌進(jìn)行表征，并通過(guò)酸浸實(shí)驗(yàn)考察其在弱酸性介質(zhì)中的穩(wěn)定性。結(jié)果表明：當(dāng)x≤0.5時(shí)，Ti能完全地納入尖晶石晶格，并使晶胞參數(shù)增大、晶粒變小；Li-Mn-Ti復(fù)合氧化物酸浸前、后能夠保持尖晶石的結(jié)構(gòu)和形貌，具有結(jié)構(gòu)穩(wěn)定性，但其化學(xué)穩(wěn)定性還有待進(jìn)一步提高。
關(guān)鍵字: 鋰離子篩；Li-Mn-Ti復(fù)合氧化物；結(jié)構(gòu)；穩(wěn)定性；酸介質(zhì)
（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
