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《硅-硅氧化物-锡-碳复合物论文：锂离子电池负极材料硅—硅氧化物—锡-碳的制备及性能研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、硅-硅氧化物-锡/碳复合物论文：锂离子电池负极材料硅—硅氧化物—锡/碳的制备及性能研究【中文摘要】碳材料作为锂离子电池负极材料,具有很好的循环寿命和安全性。尽管碳材料表现出良好的可逆性和循环性,但理论比容量只有372mAhg-1,无法满足高能量密度的电子产品和电动车用锂离子电池的需要。作为锂离子电池负极材料硅具有最高的理论比容量(4200mAhg-1),锡也具有较高的理论比容量(994mAhg-1).但是,在电池充放电过程中,随着锂离子的嵌入和脱出,其体积膨胀和收缩很大而很容易碎裂,导致电极被破坏而
2、在几个循环后容量衰减很快,甚至消失。因此,目前大量的研究工作者都致力于研究和解决其循环性能差的问题。本论文根据大量的国内外文献资料调研,紧跟该领域的研究前沿,采用碳热【英文摘要】Carbonmaterialsareutilizedasanodematerialsfortheimprovementofsafetyandcyclelifeinlithiumbatteries.Althoughcarbonmaterialsshowgoodreversibilityandstabilityforcycles
3、,theirspecificcapacitiesarelimitedto372mAhg-1.Itcan’tsatisfiedthedemandsofhigh-energy-densitylithiumbatteriesinelectronicsandelectricalvehicles.AsanodematerialsforLi-onbatteries,siliconhasahighesttheoreticalspecificcapacityof4200mAhg-1,tinhasaspecificc
4、apacityof994mAhg-1.Butsiliconandtinundergolargevolumetricchangeduringlithiuminsertion,itisregardedthattheexpansionandcontractionoflithiumsilicideduringthecharge-dischargecyclingleadstothepulverizingofSiandSnpowderisformed.Itwouldcausethebreakdownofthee
5、lectrodematerials,resultinginthelossofcapacitywithinseveralcycles.Therefore,manyresearchworkswerecarriedoutonmethodstostudyandimproveitscyclelifeinrecentyears.ThisdissertationisaresultofresearchworkintheareaofLi-ionbatteries,anditisbelievedthatthesubje
6、ctunderstudyisafrontierofcurrentresearchtopics.ThemodifiedSi-SiOx-Sn/Chasbeensynthesizedbyacarbonthermalreductionmethodandahightemperaturesolid-statemethod,theinfluenceofvarioustemperaturesandmodifywereinvestigatedinthisworkthroughaseriesofexperiments,
7、andfollowingconclusionsweredrawn:1.Si-SiOx-Sn/Ccompositeswerepreparedbyacarbonthermalreductionmethod.Theelectrochemicalperformanceofthecompositesasanodematerialforlithium-ionbatterieswasstudied.Thecompositeswerepreparedatdifferenttemperatureinnitrogenf
8、low,andcoldedtoroom-temperaturenaturally.TheSi-SiOx-Sn/C(950℃)compositesshowedthebestelectrochemicalperformance.Thecompositescandeliveraspecificcapacityof1475mAhg-1at150mAg-1.Theyhaveahigherspecificcapacitiesaftersixtycycles.2.ModifiedS
