尖晶石型锰酸锂.ppt

尖晶石型锰酸锂;;;;;阴离子掺杂;;结语与展望;Next;A:1.5克PMMA（聚甲基丙烯酸甲酯(Mw = 130,000））+50 ml 丙酮 B:Li(CH3COO)2H2O, Mn(CH3COO)2 4H2O and Al(NO3)3 9H2O (a total mass of 15 g) with a molar ratio of 1.0:1.9:0.1 溶解在100毫升乙醇 The solution A was then added dropwise to the solution B within 0.5 h under magnetic agitation（磁力搅拌）。 The metal salts were trapped in the PMMA matrix with evaporation of acetone and ethanol at 60 C for another 0.5 h forming the precursor。 The precursor was calcined at 700 C for 6 h in the air atmosphere producing the product. ;;;;;;;;These spinels are prepared by a solid-state reaction among the precursors -MnO2, LiOH, and the respective oxide/salt of the doping ions at 750 ?C for 72 h and milled for 30 min. In the charge and discharge tests, the doped spinels present outstanding initial values of the specific discharge capacity C (117–126mAh g?1), decreasing in the following order: C(Li1.05Al0.02Mn1.98S3.02O3.98) C(Li1.05Al0.02Mn1.98F3.02O3.98) C(Li1.05Ga0.02Mn1.98S3.02O3.98) C(Li1.05Ga0.02Mn1.98F3.02O3.98) C(Li1.05Co0.02Mn1.98S3.02O3.98) C(Li1.05Co0.02Mn1.98F3.02O3.98). The doped spinel Li1.05Ga0.02Mn1.98S3.02O3.98 presents an excellent electrochemical performance, with a low capacity loss even after 300 charge and discharge cycles (from 120 to 115mAh g?1 or 4%).;Thank You !