锂离子电池的碳导电添加剂.ppt

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1、CIBF2005,April3rd,2005CarbonConductiveAdditivesforLithiumIonBatteries锂离子电池的碳导电添加剂MichaelE.Spahr,YeBingCIBF2005,April3rd,2005Outline大纲1.Introduction(介绍）Whycarbonmaterialsasconductivematrix?为什么碳材料可以作为导电体Roleofthecarbonconductivematrix,碳导电体的作用2.Graphiteasconductiveadditive石墨作为导电添加

2、剂3.Carbonblackasconductiveadditive碳黑作为导电添加剂4.Graphiteorcarbonblack?选择石墨还是碳黑5.Conclusions结论CarbonconductiveadditivesforlithiumionbatteriesCIBF2005,April3rd,2005Carbonconductiveadditives碳导电添加剂Advantagesofcarbonadditivesinelectrochemicalapplications碳导电添加剂在电化学应用中的优点electricalconduc

3、tivity导电性thermalconductivity(graphiteinparticular)导热性(特别是石墨)non-toxicandenvironmentallybegnin无毒环境友好availableinhighquantityandpurity高纯度chemicallyinert化学稳定性lowweight低重量relativelylowproductioncosts相对低的制造成本2.conductivecarbonblacks导电碳黑1.primarysyntheticandnaturalgraphitepowders原生合成和

4、天然石墨粉(Xylenedensity:2.230-2.267gcm-3,二甲苯密度graphiteinterlayerdistance石墨层距c/2:0.3354-0.3360nm)CIBF2005,April3rd,2005Influenceofthecarbonconductiveadditive碳导电剂的影响1.Electrodeimpedanceoptimization电阻的最优化Increaseoftheelectronicconductivity增加导电性(mathematicallydescribedbythePercolationT

5、heoryortheEffectiveMediumTheory渗透理论的数学描述)Ultimateresistivitylevel最终的电阻率Percolationcurve渗透曲线r[W*cm]0.11vol.%C51015Slope斜率Resistivityleveloftheelectrodematerial电极的导电Limitsforthinfilmelectrodes,butsuitableformaterialcomparisons对薄膜电极有局限性,但适用材料的比较CIBF2005,April3rd,2005Influenceofthe

6、carbonconductiveadditive碳导电剂的影响Increaseoftheionicconductivity增加离子导电性(electrolyteretentionandlithiumiontransportrateintheelectrodepores电解液的保持和在电极孔中锂离子的传送速率)-electrolyteabsorption电解液的吸收-controlofelectrodeporestructure电极多孔结构的控制2.Energydensityoptimization能量密度的最优化electrodedensity(co

7、mpactionproperties)电极密度(压实性)electrolyteandpolymerbindercontent(polymer/electrolyteabsorption)电解质和高分子粘接剂的含量electrochemicalandchemicalsidereactions(surfacearea)电化学和化学副反应3.Electrodemanufacturingprocess(slurrypreparation)电极生产过程(制浆)-viscositycontroloftheslurry(solventabsorption)浆料的粘

8、度控制-dispersibilityintheliquidmedia分散在液体介质中1.Electrodei