液相法制备LiMn_2O_4及掺杂研究

The spinel phase of LiMn_2O_4 doped spinal as a cathode material synthesized by solution process

以LiNO3,Mn(NO3)2和弱有机酸为原料,将其按一定比例混合,先于低温蒸干水分,再在250℃加热1h,得到黑色前驱物粉末;将前驱物在650～800℃焙烧10～20h便可得到LiMn2O4晶体.此外,研究了生产LiMn2O4晶体过程中温度及添加Ni,Co,Al对LiMn2O4晶化程度和结晶结构的影响.研究结果表明:利用液相法可以使反应物充分反应,能够得到晶形完整、结晶度高的尖晶石型LiMn2O4;并通过该液相法能更均匀掺杂,得到晶粒粒径更小的掺杂Ni,Co,Al型LiMxMn2-xO4.

Lithium manganese oxides LiMn2O4 was produced by the raw material of LiNO3, Mn(NO3)2 and feebleness organic acid. The material was mixed by specifically proportion, braised water at low temperature, then heat up to 250 ℃ for 1 h, the black prophase powder was obtained. LiMn2O4 was obtained crystal by the process in which the prophase powder was roasted at 650-800℃ on 10~20 h. The influence of heating temperature and added Ni, Co, Al on the crystal degree crystal structure was investigated in the process of produced Lithium manganese oxides LiMn2O4. The results show that a solution process can be used for obtaining LiMn2O4 and doped spinal phases LiMxMn2-xO4 (M is Co, Ni, Al). Using this method, prefect LiMn2O4 spinal crystal and dope spinal phases LiMx.Mn2-xO4 (M is Co, Ni, Al) can be synthesized.