| LiAlxMn2-xO4的制备及其在酸介质中的稳定性 |
| Al-Doped Lithium Manganese Oxide: Preparation and Stability in Acid Medium |
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| 摘要: 采用沉淀法合成了系列掺Al尖晶石氧化物LiAlxMn2-xO4(x=0，0.3，0.5，0.7，1.0)。通过X射线衍射(XRD)、能量色散谱(EDS)和扫描电子显微镜(SEM)等方法对其结构、成分和形貌进行了表征，并通过酸浸实验考察了不同组成和不同焙烧温度的LiAlxMn2-xO4在弱酸性介质中的稳定性。结果表明当x为0.5，合成温度为850 ℃时，Al能最大程度地纳入尖晶石晶格，形成结晶致密、成分均匀的产物。同时，LiAl0.5Mn1.5O4能较大程度地抑制Mn在弱酸条件下的溶出，而具有较低的Al溶出率和较高的Li溶出率。酸浸后LiAl0.5Mn1.5O4仍保持尖晶石结构且形貌完整。 |
| 关键词: 锂锰氧化物 Al掺杂 结构 稳定性 |
| 基金项目: |
| Abstract: A series of Al-doped spinel oxides LiAlxMn2-xO4(x=0, 0.3, 0.5, 0.7, 1.0) were synthesized by precipitation method. Their structure, composition and morphology were characterized by X-ray diffraction(XRD), energy dispersive spectroscopy(EDS) and scanning electron microscopy(SEM). The stability of these Al-doped spinel oxides prepared at different temperatures was investigated in acid medium as well. The results show that Al can be brought into the spinel framework completely to form well-crystallized product according to theoretical stoichiometry when x is 0.5 and synthesis temperature is 850 ℃. To a great extent LiAl0.5Mn1.5O4 can restrain the dissolution of Mn with a relatively low Al extraction ratio and a considerable Li extraction ratio. LiAl0.5Mn1.5O4 after acid treatment still has the spinel structure and its morphology keeps integrity. |
| Keywords: lithium manganese oxide Al dopin structure stability |
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| 马立文,陈白珍,石西昌,徐 徽,杨喜云,张 坤.LiAlxMn2-xO4的制备及其在酸介质中的稳定性[J].无机化学学报,2010,26(3):413-418. |
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