摘要：通过室温固相法制备了不同元素掺杂的前驱体，并采用分步煅烧 法获得了尖晶石型 LiMn₂O₄ 和 LiM_0.2Mn_1.8O₄（M=Mg、Cd）相。 采 用 XRD 和 FTIR 技术就元素掺杂对产物晶格畸变、Mn—O 键长和键能强度等 微观结构参数和光谱频移现象进行分析。结果表明，不同元素掺杂导致 产物产生不同程度的晶格畸变。 Mg 元素掺杂使晶格收缩，Mn（Ⅳ）—O 和 Mn（Ⅲ）—O 键收缩和键能强度增加，对应吸收峰发生蓝移；Cd 元素 掺杂使晶格膨胀，Mn（Ⅳ）—O 和 Mn（Ⅲ）—O 键增长和键能强度降低， 对应吸收峰发生红移。 

关键词：尖晶石型 LiMn₂O₄；固相合成法；掺杂；晶格畸变

Abstract：The precursors of the spinel lithium manganates were synthe sized by solid method at ambient temperature，LiMn₂O₄ and Mg，Cd ele ment doped LiM0.2Mn1.8O4 were obtained by two steps calcinations. XRD and FTIR analysis results showed that the two doping elements induced different lattice distortions of LiM_0.2Mn_1.8O₄. Mg element doping resulted in the increasing of Mn（Ⅳ）—O and Mn（Ⅲ）—O bond energy and blue shifting of the absorption peaks because of the lattice shrinkage and Cd ele ment doping resulted in the bond energy decreasing and the red shifting be cause of the lattice expansion. 

Keywords：spinel lithium manganates；solid synthesis； element doping； lattice distortion