液相法制备LiMn₂O₄及掺杂研究

来源期刊：中南大学学报(自然科学版)2003年第1期

论文作者：奉冬文 邓意达 贺跃辉 林小芹 向其军 陈立宝

文章页码：66 - 69

关键词：液相法； 锂离子二次电池； LiMn₂O₄； 掺杂

Key words：solution process； Li-ion rechargeable battery； LiMn₂O₄； doped lithium

摘    要：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LiM_xMn_2-xO₄.

Abstract: 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 LiM_xMn_2-xO₄（M is Co, Ni, Al）. Using this method, prefect LiMn₂O₄ spinal crystal and dope spinal phases LiM_xMn_2-xO₄（M is Co, Ni, Al） can be synthesized.