To improve the performance, the surface of LiMn2 O4 was coated with veryfine MgO , Al2O3 and ZnO by sol-gel method, respectively. The structure and morphology o
Zn2+ - or Ti4+ -substituted cordierites with the nominal compositions of Mg1.6 Zn0.4 Al4 Si5 O18 and Mg1.8 Ti0.2 Al4.4 Si4.6 O18 respectively, were prepared by