Raws li cov khoom siv hluav taws xob rau lub hnub ci, graphite tau siv dav hauv kev tsim cov khoom siv hluav taws xob rau lub hnub ci vim nws cov hluav taws xob zoo thiab thermal conductivity thiab tshuaj lom neeg ruaj khov.
Tam sim no, muaj ob lub ntsiab ntawm cov khoom siv graphite nyob rau hauv kev ua lag luam: ib qho yog graphite dag (tseem hu ua ntuj graphite); Qhov thib ob yog high-purity graphite (tseem hu ua semi-conductive graphite).
Artificial graphite yog tsim los ntawm cov pa roj carbon atoms thiab yog cov khoom siv tsis zoo uas tsis yog xim hlau uas tuaj yeem siv los ua cov khoom siv hluav taws xob xws li cov khoom siv hluav taws xob, cov khoom siv hluav taws xob thiab cov roj carbon dub. Nws txoj kev siv tseem ceeb yog ua tus neeg sawv cev hauv kev lag luam hluav taws xob los txhim kho kev ua haujlwm ntawm kev siv hluav taws xob hluav taws xob.
Txawm li cas los xij, vim qhov tsis zoo conductivity, tsis zoo thermal conductivity, siab coefficient ntawm thermal expansion, tsis zoo thermal stability, tsis tshua muaj neeg kho tshuab lub zog thiab lwm yam yog vim li cas ntawm ntuj thiab semi-conductive dag graphite, nws tsis tuaj yeem siv ncaj qha rau hauv lub hnub ci electrodes.
Yog li ntawd, nyob rau hauv cov txheej txheem ntawm cov hnub ci hlwb, ntuj thiab semi-conductive dag graphite yuav tsum tau purified los txhim kho nws thermal thiab hluav taws xob conductivity. Nyob rau tib lub sijhawm, nws yog qhov tsim nyog los txhim kho nws cov thermal expansion coefficient thiab mechanical zog.
Tsis tas li ntawd, dag graphite, uas yog ib qho ntawm cov khoom siv tseem ceeb hauv kev lag luam photovoltaic, feem ntau yog siv los tsim cov khoom siv anode rau lithium-ion roj teeb, cov khoom siv hluav taws xob rau hnub ci hlwb, electrode pastes thiab carbon dub.
Nrog rau kev txhim kho ntawm kev lag luam photovoltaic kom siab dua voltage, cov kev xav tau zoo dua yog muab tso rau pem hauv ntej rau cov khoom siv hluav taws xob: ntawm ib sab, nws yog ib qho tsim nyog los txhim kho cov conductivity thaum ua kom muaj hluav taws xob siab; Ntawm qhov tod tes, zoo thermal stability thiab mechanical zog yuav tsum tau hloov mus rau cov kev siv nyob rau hauv hnyav tej yam kev mob.
Yog li ntawd, ntuj thiab semi-conductive dag graphite muaj qhov zoo zoo thiab tau dhau los ua ib qho ntawm cov khoom siv tsis tseem ceeb hauv kev lag luam photovoltaic, uas tseem ua rau ntuj thiab semi-conductive dag graphene ua cov khoom siv hluav taws xob feem ntau siv hauv photovoltaic teb tau txais ntau dua thiab ntau xim los ntawm kev ua lag luam.
1. Npaj cov ntaub ntawv carbon-based electrode tshiab
Ntuj thiab semi-conductive dag graphite ua anode cov ntaub ntawv rau lithium-ion roj teeb, ua ke nrog lwm cov khoom siv xws li carbon dub thiab conductive polymers, tuaj yeem siv los npaj lithium-ion roj teeb anode cov ntaub ntawv, uas tuaj yeem txhim kho lub zog ceev thiab lub voj voog. lub neej ntawm cov roj teeb.
Lub deposition ntawm carbon nanotubes los ntawm tej yam ntuj tso thiab semi-conductive dag graphite los npaj cov pa roj carbon nanotube / graphite composites thiab siv lawv li anodes ntawm lub hnub ci hlwb tuaj yeem txhim kho lawv lub zog ceev, kev them nqi hluav taws xob, kev ua haujlwm thiab lub neej voj voog.
Cov pa roj carbon nanotube / graphene composites tau npaj los ntawm ib txoj hauv kev yooj yim siv cov graphite thiab carbon nanotubes ua raw khoom.
Kev sib xyaw ntawm carbon dub thiab graphene yog sib xyaw ua ke thiab ntxiv rau cov khoom siv hluav taws xob polymer los tsim cov khoom siv roj teeb lithium-ion anode.
2. Tshiab lithium-ion roj teeb anode
Nrog rau txoj kev loj hlob ntawm high-zog-density lithium-ion roj teeb, cov kev xav tau siab dua tau muab tso rau pem hauv ntej rau cov khoom siv anode, tshwj xeeb tshaj yog rau lub peev xwm loj, lub voj voog ntev, tus nqi qis thiab kev siv lithium tsawg.
Graphene tau dhau los ua ib qho kev tshawb fawb hotspots ntawm lithium-ion roj teeb anode cov ntaub ntawv vim nws lub peev xwm tshwj xeeb.
Tsis tas li ntawd, cov khoom siv carbon sawv cev los ntawm graphite tau maj mam dhau los ua qhov kev tshawb fawb hotspot nyob rau hauv xyoo tas los no.
3. Tshiab graphite-based lithium-ion roj teeb electrode slurry
Graphene yog dav siv nyob rau hauv lub tshav pob ntawm lithium-ion roj teeb vim hais tias ntawm nws cov zoo heev electrocatalytic kev ua tau zoo, thiab yog ib tug zoo tagnrho cov ntaub ntawv rau kev npaj ntawm high-kev ua tau zoo lithium-ion roj teeb anodes, tab sis nws daim ntawv thov nyob rau hauv lithium-ion roj teeb muaj kev cuam tshuam loj heev. Nws tsis zoo conductivity thiab loj ntim expansion tom qab adsorption ntawm lithium ions ntawm qhov chaw.
Txhawm rau daws qhov teeb meem no, cov kws tshawb fawb ntawm Seoul National University hauv Kaus Lim Kauslim tau siv tshuaj vapor deposition (CVD) kom loj hlob graphene txheej ntawm cov graphite, thiab cov txheej graphene sib xyaw nrog cov ntawv graphite kom tau cov ntaub ntawv sib xyaw.
Cov txiaj ntsig tau pom tias: (1) Cov qauv sib xyaw tsis tsuas yog daws qhov teeb meem ntawm kev yooj yim agglomeration ntawm graphene nplooj ntawv, tab sis kuj txhim kho cov khoom siv ntawm cov ntawv graphite; (2) Qhov saum npoo ntawm graphene txheej hauv cov khoom sib xyaw muaj ntau pawg organic, uas tuaj yeem txhim kho cov reactivity ntawm graphene thiab lithium ntsev; (3) Cov qauv peb-dimensional network tsim nyob rau hauv cov ntaub ntawv sib xyaw tuaj yeem tiv thaiv kev sib cuag ntawm cov khoom hauv lub roj teeb thiab txhim kho cov tshuaj tiv thaiv electrochemical kinetics.
4. Kev tshawb fawb thiab kev soj ntsuam ntawm kev npaj technology thiab cov txheej txheem tseem ceeb ntawm conductive paste-anode
Electrode muab tshuaj txhuam yog tsim los rau hauv cov ntawv nplaum electrode thiab sib xyaw nrog cov khoom siv hluav taws xob los tsim cov khoom siv roj teeb nrog cov khoom siv hluav taws xob ua cov khoom siv hluav taws xob tam sim no, uas yog ib feem tseem ceeb ntawm cov roj teeb ua haujlwm, thiab nws cov kev ua tau zoo cuam tshuam rau cov roj teeb.
Kev npaj technology ntawm conductive paste-anode muaj xws li graphite purification technology, lithium-ion roj teeb electrode npaj technology thiab graphite electrode npaj technology.
Lub conductive slurry feem ntau yog tsim los ntawm cov khoom siv hluav taws xob lossis cov khoom siv anode, uas tuaj yeem muab ntxiv rau hauv electrolyte ua lub lubricant thaum lub sij hawm electrode ua kom muaj kev sib cuag ntawm cov electrode thiab electrolyte, txo txoj kev ion diffusion, thiab nce cov tshuaj tiv thaiv thiab tshuaj tiv thaiv qhov tob kom txo cov nqi.