以煅烧二氧化锰制备尖晶石型锰酸锂研究

A Research on Spinel Lithium Manganese Oxide Synthesized with Calcinated Manganese Dioxide

研究了电解二氧化锰粉体经850℃煅烧后的物相、形貌和比表面积,并分别以煅烧二氧化锰和未煅烧二氧化锰为锰源采用固相法制备了尖晶石型锰酸锂,比较了2种锰酸锂在物相、形貌、比表面和电性能方面的差异。结果表明:电解二氧化锰经850℃煅烧10 h后,产物为多孔的Mn2O3颗粒,比表面为1.250 m2/g;与用普通二氧化锰制备的锰酸锂相比,用煅烧二氧化锰制备的锰酸锂晶粒较大且尺寸均一、比表面积较小(0.677 m2/g)、循环性能较好,25℃下1 C循环50次后容量保持率为97.11%。

The phase, morphology and specific surface area of MnOz calcinated at 850℃ for 10 h, was studied here. And spinel LiMn204 was synthesized by high temperature reaction with calcinated MnO2 and uncalcinated MnO2 respectively. The difference of the two kinds of LiMn2O4 on phase, morphology, specific surface area and electrochemical performance was investigated. The results show that the calcinated MnO： is porous Mn2O3 with specific surface area 1. 250 m^2/g. Compared to the LiMn2O4 synthesized with uncaleinated MnO2 , the crystal grain of the LiMn2O4 with ealeinated MnO2 is larger and more uniform, and it has smaller specific surface area （0. 677 m^2/g） and better cycle performance. Its capacity maintains 97.11% after 50 cycles with 1 C rate at 25℃.