Al掺杂对尖晶石型Li[Mn(Al)]_2O_4结构的影响

Effects of Al Doping on the Spinel Structure of Li_2O_4

采用共沉淀法按不同 Al掺杂比例 x[x=n( Al)∶ n( Mn+ Al) =0 ,0 .0 2 5 ,0 .0 5 0 ,0 .1 0 0 ,0 .1 5 0 ,0 .2 0 0 ]制得了 Al( OH) 3 和 Mn3 O4混合物 ,将其与 Li NO3 按一定比例混合 ,在空气中于 70 0℃烧结得Li[Mn( Al) ]2 O4样品 .X射线衍射和 Raman光谱结果表明 ,在 0≤x≤ 0 .2 0范围内均得到了单相的尖晶石型样品 ,随着 x的增加 ,晶胞参数减小 ,晶格振动能量增加 ,Mn( Al)— O的结合增强 ,结构稳定性增强 .

The mixtures of Al(OH) 3 and Mn 3O 4 with different molar ratios, x[x=n(Al)∶n(Mn+Al)=0, 0.025, 0.050, 0.10, 0.150, 0.20] were prepared by the coprecipitation method. The mixtures were sintered at 700 ℃ after mixed with LiNO 3. The XRD and Raman results show that the mixtures are the single phase spinel Li 2O 4 with Al content, x, between 0 and 0.20. The crystal parameter decreases, the lattice vibration energy increases, the bond of Mn(Al)-O becomes stronger, and the structure stability is enhanced when Al content increases.