Modified lithium manganese oxides were prepared by using LiMn 2 O 4 and LiCoO 2 as precursors by solid state reaction.A study has been carried out by TG - DSC,XRD and FTIR to analyze the reaction process and structura...Modified lithium manganese oxides were prepared by using LiMn 2 O 4 and LiCoO 2 as precursors by solid state reaction.A study has been carried out by TG - DSC,XRD and FTIR to analyze the reaction process and structural characterization of products.The results showed that the LiMn 2 O 4 reacted chemically with LiCoO 2 at high temper - ature.Li and Co atom could insert into the LiMn 2 O 4 crystal lattice and obtained the Cobalt - Doped spinel com - pound.The results of constant - current cyclic test showed that the cyclic stability of the products are increased with the amount of doped LiCoO 2 ,while their initial capacity is decreased.展开更多
The LiMn2O4 spinel was prepared by wet method using Li2CO3, Mn(CH3COO)2·4H2O and CO2 as raw materials. The products were measured by TG/DTA, XRD, IR. The results Showed that the sample calcined at 800℃for 10h wa...The LiMn2O4 spinel was prepared by wet method using Li2CO3, Mn(CH3COO)2·4H2O and CO2 as raw materials. The products were measured by TG/DTA, XRD, IR. The results Showed that the sample calcined at 800℃for 10h was well crystallized monophase product. The contents of Mn?and Mn?of LiMn2O4 spinel were determined simultaneously by spectrophotometric analysis with pyrophosphoric acid.展开更多
文摘Modified lithium manganese oxides were prepared by using LiMn 2 O 4 and LiCoO 2 as precursors by solid state reaction.A study has been carried out by TG - DSC,XRD and FTIR to analyze the reaction process and structural characterization of products.The results showed that the LiMn 2 O 4 reacted chemically with LiCoO 2 at high temper - ature.Li and Co atom could insert into the LiMn 2 O 4 crystal lattice and obtained the Cobalt - Doped spinel com - pound.The results of constant - current cyclic test showed that the cyclic stability of the products are increased with the amount of doped LiCoO 2 ,while their initial capacity is decreased.
文摘The LiMn2O4 spinel was prepared by wet method using Li2CO3, Mn(CH3COO)2·4H2O and CO2 as raw materials. The products were measured by TG/DTA, XRD, IR. The results Showed that the sample calcined at 800℃for 10h was well crystallized monophase product. The contents of Mn?and Mn?of LiMn2O4 spinel were determined simultaneously by spectrophotometric analysis with pyrophosphoric acid.
