Synthesis and character of spinel LiMn2O4

1　INTRODUCTIONTheincreasingconcernsonportableelectricele mentsdemandmoreandmoreelectrochemicalener gy .Countriesallovertheworldhaveputlargequan tityofmanuallabors ,materialresourcesandfinancialresourcesonbasicresearchanddevelopmentonnewtypeofrechargeablebatteries1,2 ] .However ,thisnewtypeofbatteriesisbasedonstudyinganddevel opingperfectperformanceofmaterials ,especiallyonmaterialsofthelithiumbatteries.LixMn2 O4 cathodematerialshavebeenwidelystudiedoverthelasttwodecadesasapotentialcand…

Synthesis and character of spinel LiMn2O4

The spinel LiMn2O4 was made from Li2CO3 and MnO2 by combining the soft chemical treatment with the solid state reaction. The heating temperature was auto-controlled by program and the two-step treatment was adopted. The synthesis mechanism of the spinel LiMn2O4 was studied by TGA-DTA analysis. It is found that the reaction of Li2CO3 and MnO2 will occur at the temperature lower than 600 ℃ and MnO2 has self-catalysis function during the reaction. The results of XRD and SEM to the synthesized materials show that the LiMn2O4 phase is pure,with regular appearance and uniform granularity distribution. The electrochemical tests indicate that the spinel LiMn2O4 has perfect cycling performances and the cycling capacity still keeps at 109. 6 mA · h/g after 5 cycles.