Li2MnO3-doped spinel LiMn2O4 composites were synthesized by sol-gel method to improve the electro- chemical performance of LiMn2O4. The microstructures, morphologies and electrochemical performance of the obtained xLi2MnO3.（1-x）LiMnEO4 composites were characterized by X-ray diffraction（XRD）, scan electron microsco- py（SEM） and a galvanostatic charge-discharge process. It was found that both Li2MnO3 and LiMn2O4 components exist in xLi2MnO3·（1-x）LiMn204（O〈x〈1） composites. The 0.3Li2MnO3·0.7LiMnEO4 composite shows the optimized electrochemical performance, including discharge capacity and cycle stability. It was demonstrated that LiEMnO3-doped spinel LiMn204 cathode material can work at wide potential window with quite good capacity reten- tion and considerably larger reversible capacity compared to single-phase LiMn204 component.
NiO nano-crystal powders with cubic structure were synthesized by molten salt method. The synthesized materials were characterized by XRD, TEM, N2 adsorption-desorption and TG, etc. Not only are the eminent characters of weak agglomeration, narrow distribution and fine crystalline configuration, but the average crystal sizes of synthesized NiO powders could be efficiently controlled from 10 nm to 100 nm by changing the calcination conditions, such as calcination temperature, calcination time, and proportion of molten salt KNO3. Molten salt method is technologically easy and cheap, for the production of NiO nano-crystal powders in industrial scale.
