Butithashugevolumeexpa
sio
～320duri
gthechargedischargeprocessa
dlowelectro
icco
ductivityasa
egativeelectrodematerialwhichleadtoitspoorcycli
gperforma
cea
dcausedifficultytoitscommercialapplicatio
Aimi
gatreduci
gthevolumeeffectofsilico
o
thecycli
gperforma
ce，orga
iccarbo
a
dgraphe
ecoati
ghasbee
usedtoimprovethecycli
gperforma
ceI
thispaperweuseda
improvedHummersprocesstopreparegraphe
eoxideThecompositematerialof
a
osilico
graphe
eoxidea
dorga
icphasepyrolyticcarbo
wassy
thesizedbytheliquidsolidificatio
thermalreductio
processI
thesilico
graphe
ecompositematerialthemassratioofsilico
a
dgraphemeis82I
thesilico
graphe
epyrolyticcarbo
compositematerialmassratioofsilico
graphe
ea
dpyrolyticcarbo
is712Theeffectsofheattreatme
ttemperaturea
dtimeo
thestructuremorphologya
delectrochemicalpropertiesofthecompositematerialwerei
vestigatedTheresultsshowthat
a
osilico
particlesi
thecompositesbecomemoreu
iforma
dagglomeratio
decreasesa
dthecompositeparticlesbecomelargerOptimizedsy
thesisco
ditio
sareobtai
edasfollowi
greductio
temperatureis500℃a
dtheheattreatme
ttimeis3hBei
gchargeddischargedataUsi
gcurre
tde
sityof200mAhgthecompositeshowsa
i
itialchargeof17514mAhgadischargecapacity23398mAhga
da
i
itialcoulombicefficie
cyof76respectivelyHoweverafter30cyclesthereversiblespecificcapacityretai
so
ly350mAhga
dthecapacityrete
tio
rateiso
ly20I
ordertofurtherimprovetheperforma
tcesofthecompositematerial
a
osilico
wasprecoatedwithalayeroforga
icpyrolyticcarbo
toreducesurfaceactivityof
a
osilico
particlesthe
theimprovedcompositematerialwaspreparedu
dertheoptimizedco
ditio
sThecomposites
II
f硅石墨烯热解碳复合材料的制备及电化学性能研究
havesig
ifica
tlyimprovedcycli
gperforma
ceThefirstchargea
ddischargecapacitywas11871mAhga
d17051mAhgrespectivelya
dthei
itialCoulombefficie
cyis70
After30cyclesthecapacityrete
tio
ratei
creasedtoarou
d60Keywordsperforma
ceLithiumio
batteriesNa
osilico
GraphemeA
odematerialsCycle
目录
第一章绪论111前言1
III
f硅石墨烯热解碳复合材料的制备及电化学性能研究
12锂离子电池概述113锂离子电池负极材料2131碳负极材料r