Nyob rau hauv kev lag luam tam sim no lithium-ion roj teeb system, qhov txwv tsis pub tshaj yog cov hluav taws xob conductivity.Hauv particular, qhov tsis txaus conductivity ntawm cov khoom zoo electrode ncaj qha txwv cov kev ua ntawm cov tshuaj tiv thaiv electrochemical.Nws yog ib qho tsim nyog yuav tsum tau ntxiv ib tus neeg sawv cev tsim nyog los txhim kho cov khoom siv hluav taws xob thiab tsim cov khoom siv hluav taws xob kom muab cov channel ceev ceev rau kev thauj khoom hluav taws xob thiab xyuas kom meej tias cov khoom siv tau siv tag nrho.Yog li ntawd, tus neeg sawv cev conductive kuj yog ib qho khoom tseem ceeb hauv lub lithium ion roj teeb txheeb ze rau cov khoom siv.

Kev ua tau zoo ntawm tus neeg sawv cev conductive nyob ntawm qhov loj ntawm cov qauv ntawm cov ntaub ntawv thiab cov yam ntxwv uas nws tau ntsib nrog cov khoom siv.Feem ntau siv lithium ion roj teeb conductive cov neeg ua haujlwm muaj cov yam ntxwv hauv qab no:

(1) Cov pa roj carbon dub: Cov qauv ntawm cov pa roj carbon dub yog qhia los ntawm qib ntawm kev sib sau ntawm cov pa roj carbon dub rau hauv cov saw lossis cov txiv hmab txiv ntoo.Cov khoom zoo, cov saw hluav taws xob nrawm, thaj chaw loj tshwj xeeb, thiab cov khoom muaj txiaj ntsig, uas muaj txiaj ntsig los ua cov saw khi ntawm electrode.Raws li ib tus neeg sawv cev ntawm cov tshuaj tiv thaiv ib txwm muaj, cov pa roj carbon dub yog tam sim no feem ntau siv cov khoom siv hluav taws xob.Qhov tsis zoo yog tias tus nqi siab thiab nws nyuaj rau disperse.

(2)Graphite: Conductive graphite yog tus cwj pwm los ntawm qhov loj me me ze rau ntawm cov khoom siv zoo thiab tsis zoo, ib qho chaw nruab nrab ntawm qhov chaw, thiab cov khoom siv hluav taws xob zoo.Nws ua raws li ib tug ntawm cov conductive network nyob rau hauv lub roj teeb, thiab nyob rau hauv lub tsis zoo electrode, nws yuav tsis tsuas txhim kho cov conductivity, tab sis kuj lub peev xwm.

(3) P-Li: Super P-Li yog tus cwj pwm los ntawm qhov me me me, zoo ib yam li cov pa roj carbon dub, tab sis nruab nrab ntawm thaj chaw tshwj xeeb, tshwj xeeb tshaj yog nyob rau hauv daim ntawv ntawm cov ceg ntoo hauv cov roj teeb, uas yog qhov zoo heev rau kev tsim cov khoom siv hluav taws xob.Qhov tsis zoo yog tias nws nyuaj rau kev tawg.

(4)Cov pa roj carbon nanotubes (CNTs): CNTs yog cov khoom siv hluav taws xob uas tau tshwm sim hauv xyoo tas los no.Lawv feem ntau muaj txoj kab uas hla ntawm 5nm thiab ntev ntawm 10-20um.Lawv tuaj yeem tsis tsuas yog ua raws li "xaim" hauv cov tes hauj lwm sib txuas, tab sis kuj muaj ob txheej txheej electrode los muab kev ua si rau cov yam ntxwv siab ntawm supercapacitor.Nws cov thermal conductivity zoo kuj tseem ua rau cov cua kub dissipation thaum lub sij hawm roj teeb thiab tso tawm, txo cov roj teeb polarization, txhim kho cov roj teeb siab thiab kub tsis zoo, thiab txuas ntxiv roj teeb lub neej.

Raws li tus neeg sawv cev conductive, CNTs tuaj yeem siv ua ke nrog ntau yam khoom siv hluav taws xob zoo los txhim kho lub peev xwm, tus nqi, thiab kev ua haujlwm ntawm cov khoom siv / roj teeb.Cov khoom siv hluav taws xob zoo uas tuaj yeem siv tau suav nrog: LiCoO2, LiMn2O4, LiFePO4, polymer zoo electrode, Li3V2 (PO4) 3, manganese oxide, thiab lwm yam.

Piv nrog rau lwm cov khoom siv hluav taws xob, cov pa roj carbon nanotubes muaj ntau yam zoo li cov neeg ua haujlwm zoo thiab tsis zoo rau cov roj teeb lithium ion.Cov pa roj carbon nanotubes muaj cov khoom siv hluav taws xob siab.Tsis tas li ntawd, CNTs muaj qhov sib piv loj, thiab tus nqi qis dua tuaj yeem ua tiav qhov kev sib tw zoo ib yam li lwm cov khoom siv ntxiv (tsuas qhov kev ncua deb ntawm cov hluav taws xob hauv qhov sib xyaw lossis hauv zos tsiv teb tsaws chaw).Txij li cov pa roj carbon nanotubes tuaj yeem tsim cov khoom siv hluav taws xob thauj tau zoo heev, tus nqi hluav taws xob zoo ib yam li cov khoom sib txuas ntxiv tuaj yeem ua tiav nrog tsuas yog 0.2 wt% ntawm SWCNTs.

(5)Grapheneyog ib hom tshiab ntawm ob-dimensional saj zawg zog planar carbon cov ntaub ntawv uas zoo heev hluav taws xob thiab thermal conductivity.Cov qauv tso cai rau cov ntawv graphene kom ua raws li cov khoom siv nquag, thiab muab ntau qhov chaw sib cuag rau cov khoom siv hluav taws xob zoo thiab tsis zoo, kom cov khoom siv hluav taws xob tuaj yeem ua nyob rau hauv ob qhov chaw los tsim ib qho loj cheeb tsam conductive network.Yog li nws tau suav tias yog tus neeg sawv cev zoo tshaj plaws tam sim no.

Cov pa roj carbon dub thiab cov khoom siv nquag yog nyob rau hauv qhov chaw sib cuag, thiab tuaj yeem nkag mus rau hauv cov khoom ntawm cov khoom nquag kom nce qhov kev siv piv ntawm cov khoom siv.Cov pa roj carbon nanotubes nyob rau hauv txoj kab kev sib cuag, thiab tuaj yeem cuam tshuam ntawm cov khoom siv los tsim cov qauv sib txuas, uas tsis yog tsuas yog ua kom muaj kev ua tau zoo, tib lub sijhawm, nws tuaj yeem ua tus neeg sawv cev ib nrab, thiab kev sib cuag ntawm graphene. yog point-to-face contact, uas tuaj yeem txuas rau saum npoo ntawm cov khoom siv los ua ib qho chaw loj hauv kev sib txuas ua lub cev tseem ceeb, tab sis nws yog ib qho nyuaj rau tag nrho cov khoom siv.Txawm hais tias tus nqi ntawm graphene ntxiv yog tsis tu ncua, nws yog ib qho nyuaj rau siv tag nrho cov khoom siv, thiab diffuse Li ions thiab deteriorate cov electrode kev ua tau zoo.Yog li ntawd, peb cov ntaub ntawv no muaj ib tug zoo complementary qauv.Kev sib xyaw cov pa roj carbon dub lossis cov pa roj carbon nanotubes nrog graphene los tsim kom muaj kev ua tiav kev sib txuas ntxiv tuaj yeem txhim kho tag nrho cov kev ua tau zoo ntawm cov electrode.

Tsis tas li ntawd, los ntawm qhov kev xav ntawm graphene, kev ua tau zoo ntawm graphene sib txawv los ntawm kev npaj sib txawv, nyob rau hauv qhov kev txo qis, qhov loj ntawm daim ntawv thiab qhov sib piv ntawm carbon dub, dispersibility, thiab thickness ntawm cov electrode tag nrho cuam tshuam rau cov xwm. ntawm conductive agents heev.Ntawm lawv, txij li kev ua haujlwm ntawm tus neeg sawv cev conductive yog los tsim lub network conductive rau kev thauj khoom hluav taws xob, yog tias tus neeg sawv cev conductive nws tus kheej tsis zoo dispersed, nws yog ib qho nyuaj rau tsim kom muaj kev sib txuas lus zoo.Piv nrog rau cov tsoos carbon dub conductive tus neeg sawv cev, graphene muaj qhov tshwj xeeb ntawm qhov chaw siab tshaj plaws, thiab π-π conjugate nyhuv ua rau nws yooj yim rau agglomerate hauv kev siv tswv yim.Yog li ntawd, yuav ua li cas kom graphene tsim ib tug zoo dispersion system thiab siv tag nrho nws cov kev ua tau zoo heev yog ib qho teeb meem tseem ceeb uas yuav tsum tau daws nyob rau hauv daim ntawv thov dav ntawm graphene.