炭-石墨復(fù)合材料作為鋰離子電池負(fù)極材料研究.pdf

1、氆懋縫⑧滅畢大謦J近代第一所大寧碩士學(xué)位論文一’■■0_I■■；■爿j■lE■■■0■■■■_學(xué)科專業(yè)：化學(xué)工蘆作者姓名：馬鐵指導(dǎo)教師：王成揚(yáng)教授天津大學(xué)研究生院2005年12月ABSTRACTNaturalgraphitehastheperformancesofgoodlithiumstorageandbadcompatibilitywithelectrolyteAnditcanbemodifiedbyusingthephysical

2、andchemicalcoatingmethodsinordertoimprovecycleefficiencyThesurfacefunctionalgroupsofnaturalgraphitewerechangedafterbeingoxidizedbyH202，whichcouldimprovetheperformanceofcompositegraphiteThemethodofchemicalcoatingwithcoalt

3、arpitchwasusedtoamelioratetheperformancesofnaturalgraphiteTheresultsweremeasuredbyXraydiffraction，scanningelectronmicroscopeandgalvanostaticcharge—dischargecyclingtechniquesThereversiblecapacityofcoatednaturalgraphitetre

4、atedat420。Cfor4hkeptabove325mAg／handthefirstcycleefficiencyreachedto902％Theoxidizedgraphitewastreatedwithphenolresinascoatingagenttopreparecompositeanodematerial，whichinvolvesliquidphenol—impregnationandcarbonizationproc

5、essAfterresearchingintothesurfacemorphologystructures，charge—dischargeandtheelectrochemicalperformancesoftheoxidizedandnonoxidizednaturalgraphite，theconclusionsshowedthatthepyrolysisofresincouldcoatgraphitewellandmakethe

6、surfaceofgraphitemorelubricitywhi吐helpedtoimprovethelithiumioninsertion／deinsertionperformanceofnaturalgraphiteBythecomparisonofthepre—oxidation，carbonizationyield，oxygencontentandelectrochemicalperformancebetweentheoxid

7、ationsampleandunoxidationsamples，theresultsprovedthatthecarbonizationyieldofthecompositegraphiteincreasedfrom9012％to9317％，theoxygencontentofgraphiteincreasedfrom37％to58％，whichimprovedtheelectrochemicalperformanceofthecom