Kev paub yooj yim ntawm cov ntaub ntawv tsis zoo electrode - Graphite cov ntaub ntawv

Kev paub yooj yim ntawm cov ntaub ntawv tsis zoo electrode - Graphite cov ntaub ntawv
Graphite yog ib qho ntawm cov ntaub ntawv tsis zoo rau hluav taws xob siv rau hauv lithium {{} ion roj teeb. Nws muaj kev ua haujlwm zoo, siab crystallinity, thiab ib tug zoo fawm txheej qauv. Nws yog qhov tsim nyog rau kev ntxig / rho tawm ntawm lithium ions los ua cov lithium {}} graphite interlayer compounds. Tus nqi - qhov tseeb muaj peev xwm tuaj yeem ncav cuag ntau dua 300 h / g, lub peev xwm tsis sib haum yog tsawg dua 50ma • h / g. Cov Lithium extraction hauv graphite tshwm sim thaum txog 0 ~ 0.25V (vs. li + / li). Nws muaj tus nqi zoo - Qhov muaj peev xwm tshem tawm platform thiab tuaj yeem phim ntau cov ntaub ntawv electrode zoo nrog limn2o4. Qhov nruab nrab tso zis hluav taws xob ntawm lub roj teeb yog siab. Tam sim no yog qhov siv dav dav tshaj plaws rau cov khoom siv hluav taws xob rau cov lithium- ion roj teeb. Graphite belongs rau Hexagonal Crystal system. Nws cov muaju yog tsim ntawm hexagonal Mesh planes muaj cov pa roj atoms thiab ua ntu zus. Nws muaj qauv fawm.
Hauv txhua txheej, cov pa roj carbon atoms yog teem rau hauv hexagon atoms nrog SP2 hybrid, thiab cov tshuab hluav taws xob, thiab cov tshuab hluav taws xob rau ntawm daim ntawv cog lus p orocalized. Tam sim no, cov graphite {{2} Raws li cov ntaub ntawv carbon microbeads (MCMB), graphitized fibers, thiab graphite graphite.

MCMB muaj cov duab sib txawv tag nrho, cov txheej txheem siab tshaj plaws, cov qauv txheej txheem loj heev, thiab cov lithium loj li cov roj ntsha muaj peev xwm ib yam ntim. Nws tau tsim thawj zaug thiab tsim los ntawm Ostaka Gas tuam txhab ntawm Nyiv thiab yog siv los ua cov khoom tsis zoo electrode rau lithium {1} ion roj teeb. MCMB muaj qhov chaw du thiab thaj chaw me me, uas tuaj yeem txo cov ciaj ciam electrode thaum lub peev xwm poob thaum thawj cov txheej txheem them; Tsis tas li ntawd, lub npas me me muaj cov qauv lamellar, uas yog conducive cov ntaub ntawv tshwm sim los ntawm kev qhia txog cov kab, thiab yog li muaj qee qhov nrawm thiab siab tam sim no them nyiaj thiab muaj peev xwm tawm. Mas graphitized mCMB yog tau los ntawm kev kawm cov pob zeb tawg kom tau txais mesophase cov pob roj carbon monoxide, uas yog tom qab ntawd ua kom huv thiab lwm txoj hauv kev thiab tom qab ntawd kho kom sov. Raws li cov khoom tsis zoo electrode rau lithium {{} ion roj teeb, MCMB muaj lub zog loj ntawm kev kho kom sov thiab sijhawm. MCMB yog ib qho ntawm cov ntaub ntawv tsis zoo electrode tam sim no siv nyob rau hauv ntev- roj teeb me me thiab nws cov teeb meem tseem ceeb yog qhov muaj peev xwm tsawg thiab tus nqi siab.

Ntxiv rau MCMB, muaj lwm hom duab cuav ua los ntawm cov pa roj carbon. - tso cov duab fiber ntau yog cov duab fiber ntau nrog cov qauv Hollowular. Raws li cov khoom tsis zoo electrode rau lithium {3} ion roj teeb, nws muaj qhov tawm tau muaj peev xwm ntau tshaj 320MA 5}} h / g thiab tawm kev ua haujlwm ntawm 93%. Piv nrog lwm cov pa roj carbon lossis graphite tsis zoo electrode cov ntaub ntawv, lithium {{}} ion cov roj teeb tau ua tau zoo tshaj plaws thiab kev tawm tsam kub, thiab lub neej ntev dua. Txawm li cas los xij, vim cov txheej txheem npaj ua ke ntawm roj av {}}}} {{{} ion roj teeb yuav raug rau qee qhov kev txwv. Kev kho cov khoom xyaw ua ntej npaj los ntawm doping, kev hloov kho txheej txheem ntawm cov roj carbon yooj yim xws li kev kho vaj roj av yooj yim muaj kev ua tiav zoo thiab tus nqi qis dua MCMB. Tam sim no, Nyij Pooj thiab lwm lub tebchaws tau pib tsim thiab siv. Tseem muaj ntau yam tsis zoo ntawm graphite li tsis zoo electrode, xws li: Sai zaj yeeb yaj kiab, thaum ua rau cov txheej txheem graphite los tev tawm thiab txo lub neej; Graphite Cov khoom muaj kev sib xyaw tsis zoo nrog PC cov kuab tshuaj; Li * tsuas yog yuav tau embedded thiab muab rho tawm los ntawm cov flake Callity, thiab vim muaj qhov me me ntawm thaj tsam thiab kev sib txawv ntev ntev rau kev them nyiaj thiab kev tso tawm ntev dua; Lub graphite tshav kub kev kub ntxhov feem ntau yuav tsum tau nyob saum 2000C, uas nce ntau lawm tus nqi; Thaum lub peev xwm ncav cuag 0V lossis qis dua, nws yog xim hlau lithium tej zaum yuav muab tso rau ntawm graphip electrode. Vim tias saum toj no qhov tsis zoo ntawm cov graphite tsis tau pom, hloov kho graphite yog dav siv hauv kev xyaum. Ntawm lawv, txheej txheem txheej txheem saum npoo, kev hloov kho tshuaj thiab kev sib txawv yog cov kev kho mob tseem ceeb tam sim no. Cov txheej txheej sib piv nrog cov txheej txheem organic thiab inorganic txheej, thiab kev hloov kho tshuaj lom neeg feem ntau suav nrog oxidation, txo thiab kev hloov kho tshuaj lom neeg tshuaj lom neeg.