英语翻译

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2.1.Sol–gel(SG)method

Li1.05Ni1/3Co1/3Mn1/3O2cathodematerialwassynthesizedbythecitricacidsol–gelmethod[31]infollowingmanner.StoichiometricamountsofLi(CH3COO)•2H2O,Mn(CH3COO)2•4H2O,Ni(CH3COO)2•4H2O,andCo(CH3COO)2•4H2Oweredissolvedindistilledwater.Citricacidwasusedasachelatingagent.ThesolutionpHwasadjustedto7.0withammoniumhydroxide.Thesolutionwasheatedat70–80◦Cuntilatransparentsolwasobtained.The

resultinggelprecursorwasdriedat120◦Cfor4hinairandfollowedwithdecompositionat450◦Cfor8htoremovetheorganiccontents.Thedecomposedpowdersweregroundbyballmilling(Spex8000Mixer/Mill)withstainlesssteelballsfor2handsinteredat850◦Cinairfor12h.Theheatingandcoolingratesofthe

powderwere4◦Cand2◦Cmin−1,respectively.

2.2.Co-precipitation(CP)methodLi1.05Ni1/3Co1/3Mn1/3O2cathodematerialwassynthesizedbyco-precipitationmethodfromNi–Co–Mnmixedhydroxideprecursor[17,24].Theprecursor(Ni1/3Co1/3Mn1/3)(OH)2wasprepared

bydissolvingstoichiometricamountsofNi(CH3COO)2•4H2O,Co(CH3COO)2•4H2OandMn(CH3COO)2•4H2Oindistilledwater(cationicratioofNi:Co:Mn=1:1:1)andtheconcentrationofthetotalmetalacetatewas2molL−1.TheaqueoussolutionwasprecipitatedbyaddingLiOH(1M)/NH4OH(3M)alongwithcontinuedstirring.Thesolutionwasmaintainedat50◦Cfor24handthepHwascontrolledto10–11.Agreenbrownmixedhydroxidewasprecipitated.

Afterfilteringandwashing,thehydroxideprecipitatewasdriedat120◦Cfor24htoremovetheadsorbedwater.Then,theobtainedprecursorwasmixedwithrequiredamountofLiOHusingaballmill(Spex8000Mixer/Mill)andthepowderwaspressedintopellets.Thepelletswereinitiallyheatedto400◦Cfor6hinairandthenreground.Pelletswereremadeandsubsequentlysinteredat900◦Cfor12hinairinamufflefurnace.Heatingupspeedwasfixedto4◦Cmin−1andcoolingdownspeedwasfixedto2◦Cmin−1