摘要
Cellulose,themostabundantorganicpolymeronEarth,isasustainablesourceofcarbontouseasanegativeelectrodeforsodiumionbatteries.Here,hardcarbons（HC）preparedbycellulosepyrolysiswereinvestigatedwithvaryingpyrolysistemperaturefrom700°Cto1600°C.CharacterisationmethodssuchasSmallAngleX-rayScattering（SAXS）measurementsandN2adsorptionwereperformedtoanalyseporositydifferencesbetweenthesamples.Thegraphenesheetarrangementswereobservedbytransmissionelectronmicroscopy（TEM）:anorderingofthegraphenesheetsisobservedattemperaturesabove1150°Candsmallcrystallinedomainsappearover1400°C.Asthegraphenesheetsstarttoalign,theBETsurfaceareadecreasesandthemicroporesizeincreases.Tocorrelatehardcarbonstructuresandelectrochemicalperformances,differenttestsinNa//HCcellswith1MNaPF6ethylenecarbonate/dimethylcarbonate（EC/DMC）wereperformed.Samplespyrolysedfrom1300°Cto1600°Cshoweda300mAh/greversiblecapacityatC/10rate（whereC=372mA/g）withanexcellentstabilityincyclingandaverygoodinitialCoulombicefficiencyofupto84%.Furthermore,hardcarbonsshowedanexcellentratecapabilitywheresodiumextractionratevariesfromC/10to5C.At5Cmorethan80%ofreversiblecapacityremainsstableforhardcarbonssynthesizedfrom1000°Cto1600°C.
出版日期
2016年05月15日（中国期刊网平台首次上网日期，不代表论文的发表时间）
