锂镍锰氧LNMO的制备.pptxVIP

锂镍锰氧LNMO的制备第1页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O4Approaches to synthesizeSolid-state reactions Sol–gel technology CoprecipitationsEmulsion drying Molten salt technologySpray pyrolysis 第2页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O4Co-precipitationorganic coprecipitationmicrowave sinteringElectrospinningPulsed laser depsition第3页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O44 Synthesis of precursorSintering process Co-precipitation 第4页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O45 Stoichiometric amounts of Mn, Li, and Ni acetates were dissolved in H2O and stirred for 1h，Oxalic-acid solution was then added dropwise under stirring.The precipitate solution was stirred for 1h before being dried at 50 ℃ over night with constant stirring. The dried precipitate was preheated at 500℃ for 6h and then ground for 30minThe preheated powder was pressed into pellets (20mm dia. and ca. 5mm thick) and annealed at 900℃ for 24h in air PrecipitateDryingPreheatSinteringPreparation Process第5页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O46 The advantages and disadvantagesAdvantages:Easy to control reaction processThe product of particles generally small and uniformGood electrochemical propertiesDisadvantage:Need to adjust the proportion of Li, Ni, Mn第6页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O4Organic coprecipitationSchematic Illustration of 8-Hydroxyquinoline Coprecipitation Route第7页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O4ABNi(Ac)2·6H2OMn(Ac)2·4H2OLiAcambient temperaturewater8-hydroxyquinoline 60°Cethanolsolid?liquid dispersion(brown flocculent precipitation)stir for 2hevaporate at 80°C without filtrationdrying in air 100°Cpreheat at 470°C for 5 hdark power precursorPreparation Process第8页/共27页 材料合成化学PPT竞赛Synthesis of LiNi0.5Mn1.5O4precursor pellets 15MPa10°C/minheating800°C24 h1°C/mincoolingSample QCTo compare, samples were prepared using solid-state method (marked as SS) and normal coprecipitation method with KOH as precipitant (mark