機械合金化法制備鋰離子電池Si基負(fù)極材料及其電化學(xué)性能研究.pdf

1、天津理工大學(xué)碩士學(xué)位論文機械合金化法制備鋰離子電池Si基負(fù)極材料及其電化學(xué)性能研究姓名：張磊申請學(xué)位級別：碩士專業(yè)：材料物理與化學(xué)指導(dǎo)教師：姜訓(xùn)勇201112AbstractInthispapersiliconbasedlithium—ionbatterynegativeelectrodewasprimaryresearchobjectivesinnewenergymaterialsresearchmechanicalalloyingm

2、ethodforthepreparationofmaterials，pureSiasthemainstudyobject，itsMAtimeis20htolOOh，andinthelatterpartoftheprocessofmaterialpreparationaddgraphite，SPandAIdopedUseX—raydiffractionforstructuralanalysis，11SeSEMforsurfacetopog

3、raphyanalysis，useparticlesizeanalyzerforparticlesizeanalysis，LANDbatterytestsystemusedtochargeanddischargetest，useIM6electrochemicalworkstationfordynamicanalysis，basedontheaboveanalysisofmaterialsforlithiumionbatterynega

4、tiveelectrode，proposereasonablemeasuresforimprovementForpureSimaterials，、)I，itllincreasingMAtime，thedegreeofamorphousincreased，butCannotformedcompletelyamorphousphase，inwhichthehighestdegreeofamorphousislOOhmaterial；afte

5、rMA，materialsparticlesizefrom29I_tminto02pro；analysisthesurfacemorphologyofdifferentMAtimehasfoundthatrawmaterialWaslargeblockandafterMAWassrnallroundandinlOOhMAtimematerialhasag四鋤啪tedparticlesByresearchthechargeanddisch

6、argeresultofdifferentMAtimematerialsfoundthatSihasahighcapacityinfirstdischargebuthaslargecapacitylossinlatercycleandpoorcyclingperformance，afterMAthefirstdischargecapacityofSihasincreasedIndynamicanalysiswefoundthatMASi

7、hasloosestructureSOitsdiffusioncoe伍cientincreasedInordertoimprovethecycleperformance，weuseSidopedAfter80hMA，wefoundcarbondopedandAI—dopedbethformedalargenumberofinertmatcrialwhichcannotreactionwithLi，howeverhasahigheramo

8、rphousdegree；theaverageparticlesizeWassamewithpureSiwhichafterMA，and110massiveparticle，haveagglomeratedparticlesBychargeanddischargetestfound，dopedmaterial’sfirstdischargecapacitydecreased，butimprovecyclingperformanccA1d