Raws li lub ntsiab lus tseem ceeb ntawm cov dej-raws cov khoom siv hluav taws xob tsis zoo, CMC cov khoom tau siv dav siv los ntawm cov chaw tsim hluav taws xob hauv tsev thiab txawv teb chaws. Qhov zoo tshaj plaws ntawm phau ntawv tuaj yeem tau txais lub roj teeb loj loj, lub neej ntev ntev thiab tsis tshua muaj hluav taws xob.
Binder yog ib qho ntawm cov ntaub ntawv tseem ceeb ntawm cov khoom siv ua haujlwm hauv cov roj teeb lithium-ion. Nws yog qhov tseem ceeb ntawm cov neeg kho tshuab ntawm tag nrho cov tshuab hluav taws xob ntawm tag nrho cov hluav taws xob thiab muaj qhov cuam tshuam tseem ceeb ntawm cov txheej txheem ntawm electrode thiab electrochemical kev ua tau zoo ntawm lub roj teeb. Lub binder nws tus kheej tsis muaj peev xwm thiab nyob ib qho kev faib ua feem tsawg hauv lub roj teeb.
Ntxiv rau cov khoom nplaum ntawm dav hlau, Lithium-Ion muaj peev xwm tiv thaiv cov khoom lag luam hauv electrolyte, ntxiv rau with mtrochemical corrosion thaum them thiab tawm. Nws tseem nyob ruaj khov nyob rau hauv cov khoom siv hluav taws xob ntau heev, yog li tsis muaj ntau cov ntaub ntawv polymer uas tuaj yeem siv los ua electrode binders rau cov roj teeb lithium-ion.
Muaj peb hom roj teeb roj teeb lithium-ion uas tau siv dav tam sim no: Polyvinylidene fluoride (sbr) emulsion thiab carboxymethyl cellulose (cmc). Tsis tas li ntawd, Polyacrylic acid (paa), dej-based binders nrog polyacrylonitrile (lauj kaub) thiab polyacrylate raws li lub ntsiab lus tseem nyob hauv ib qho kev ua lag luam.
Plaub yam ntxwv ntawm cov roj teeb-qib CMC
Vim yog cov dej tsis zoo ntawm cov acid qauv ntawm carboxymethyl cellulose, thiaj li tau siv zoo dua, CMC yog cov khoom siv dav hauv roj teeb.
Raws li lub ntsiab lus tseem ceeb ntawm cov dej-raws cov khoom siv hluav taws xob tsis zoo, CMC cov khoom tau siv dav siv los ntawm cov chaw tsim hluav taws xob hauv tsev thiab txawv teb chaws. Qhov zoo tshaj plaws ntawm phau ntawv tuaj yeem tau txais lub roj teeb loj loj, lub neej ntev ntev thiab tsis tshua muaj hluav taws xob.
Plaub yam ntxwv ntawm CMC yog:
Ua ntej, CMC tuaj yeem ua cov khoom hydrophilic thiab soluble, ua kom huv si hauv dej, yam tsis muaj cov hmoov dawb thiab impurities.
Thib ob, cov qib ntawm cov khoom siv tau hnav yog cov khoom siv thiab cov viscosity yog ruaj khov, uas tuaj yeem muab cov viscosity thiab adhesion ruaj khov.
Thib peb, tsim cov khoom lag luam siab uas muaj cov ntsiab lus hlau tsawg.
Thib plaub, cov khoom muaj kev sib raug zoo nrog sbr gratex thiab lwm cov ntaub ntawv.
CMC sodium carboxymethyl cellulose siv nyob rau hauv lub roj teeb tau txhim kho nws siv cov nyhuv siv, thiab tib lub sijhawm muab nws siv kev siv tau zoo, nrog kev siv tam sim no, nrog kev siv tam sim no, nrog kev siv tam sim no.
Lub luag haujlwm ntawm CMC hauv roj teeb
CMC yog carboxymethylated derivative ntawm cellulose ntawm cellulose, uas ib txwm npaj los ntawm kev puas yooj yim ntawm cellulose nrog feustic alkici thiab nws cov roj molecular hnyav los ntawm ntau txhiab rau ntau lab.
CMC yog xim dawb rau lub teeb daj daj, granular lossis fibrous lossis fibrous tshuaj, uas muaj cov hmoov zoo hygroscocopicity thiab yog yooj yim soluble hauv dej. Thaum nws yog nruab nrab lossis alkaline, kev daws teeb meem yog cov kua ntau-viscosity. Yog tias nws yog rhuab saum toj no 80 ℃ rau lub sijhawm ntev, qhov viscosity yuav poob thiab nws yuav insoluble hauv dej. Nws hloov xim av thaum rhuab rau 190-205 ° C, thiab carbonizes thaum rhuab rau 235-248 ° C.
Vim tias cmc muaj cov haujlwm ntawm thickening, tuav dej, cov khoom noj, luam yeeb, luam ntawv, luam tawm, luam tawm cov khoom siv aquequiles, luam tawm, luam tawm, cov khoom siv xim, luam tawm Monosodium Glutamate ".
Tshwj xeeb nyob rau hauv lub roj teeb, cov haujlwm ntawm CMC yog: dispersing qhov tsis zoo electrode cov khoom siv thiab tus neeg coj ua; thickening thiab anti-sedimentation cuam tshuam rau qhov tsis zoo electrode slurry; Pab nyiaj txiag; stabilizing kev ua haujlwm ntawm electrode thiab pab txhim kho kev ua lag luam roj teeb; Txhim kho lub zog tev ntawm tus ncej daig, thiab lwm yam.
CMC Kev Ua Haujlwm thiab Xaiv
Ntxiv CMC thaum ua lub electrode slurry slurry tuaj yeem nce viscosity ntawm slurry thiab tiv thaiv cov slurry los ntawm kev tswm. CMC yuav decompose sidium ions thiab anions nyob rau aqueous daws, uas yog ib qho yooj yim los nqus dej noo thiab muaj tsis zoo elasticity.
CMC tuaj yeem ua lub luag haujlwm zoo heev hauv kev dispersion ntawm qhov tsis zoo electrode graphite. Raws li tus nqi ntawm cmc nce, nws cov khoom siv decomposition yuav ua raws li cov khoom siv hluav taws xob yuav ua rau muaj kev sib dhos rau cov nyhuv hluav taws xob, ua tiav cov nyhuv kev zoo.
Qhov tsis zoo uas tsis zoo ntawm CMC yog tias nws yog qhov loj me. Yog tias txhua CMC yog siv los ua cov phau ntawv qhia tsis zoo electrode yuav vau rau thaum nias thiab txiav cov txheej txheem ntawm tus ncej txiav, uas yuav ua rau hmoov tsis loj. Nyob rau tib lub sijhawm, CMC tau cuam tshuam ntau heev los ntawm cov qauv ntawm cov ntaub ntawv electrode thiab cov nqi electrode, thiab cov hluav taws xob hluav taws xob yuav cuam tshuam rau kev nyab xeeb ntawm lub roj teeb.
Thaum pib, lub phau ntawv siv rau qhov tsis zoo electrode stirring yog PVDF thiab lwm yam kev tiv thaiv roj, nws tau dhau los ua cov dej-raws li cov hluav taws xob tsis zoo.
Cov phau ntawv zoo meej tsis muaj nyob, sim xaiv cov phau ntawv sau uas ua tau raws li kev ua lub cev thiab tshuab hluav taws xob. Nrog rau kev txhim kho cov roj teeb lithium lithium, nrog rau tus nqi tiv thaiv thiab ib puag ncig cov teeb meem, cov dej raws li nws yuav hloov cov roj-based binders.
CMC Ob Cov Txheej Txheem Loj Cov Txheej Txheem
Raws li kev sib txawv ntawm Othetification cov xov xwm, kev lag luam ntau lawm ntawm CMC tuaj yeem muab faib ua ob pawg: txheej txheem dej thiab cov qauv kev coj ua. Cov txheej txheem siv dej raws li cov tshuaj tiv thaiv nruab nrab yog hu ua cov txheej txheem dej hauv nruab nrab, uas yog siv los tsim cov alkaline nruab nrab thiab cov qib qis cmc. Cov txheej txheem ntawm kev siv cov tshuaj organic raws li cov tshuaj tiv thaiv nruab nrab yog hu ua cov txheej txheem hnyav, uas yog qhov tsim nyog rau kev tsim cov nruab nrab thiab qib CMC. Ob txoj kev tawm tsam no yog nqa tawm hauv lub Kneader, uas zwm rau cov txheej txheem kneading thiab tam sim no yog txoj kev loj rau kev tsim CMC.
Cov txheej txheem dej nruab nrab: ib cov txheej txheem ntau txheej txheem kev lag luam Qhov zoo dua ntawm cov txheej txheem dej nruab nrab yog tias cov cuab yeej yuav tsum tau yooj yim thiab tus nqi tsawg; Qhov tsis zoo yog tias vim tsis muaj qhov ntau ntawm cov kua dej hauv nruab nrab, cov tshuaj kub tsim los ntawm cov tshuaj tiv thaiv nce ntxiv thiab ua kom muaj kev ua tau zoo, ua rau muaj cov khoom lag luam qis thiab cov khoom lag luam tsis zoo.
Cov qauv hnyav; Kuj tseem hu ua Organic kuab tshuaj, nws tau muab faib ua kneading txoj kev thiab slurry txoj kev raws li cov tshuaj tiv thaiv depuent. Nws lub ntsiab tseem ceeb yog qhov kev ua alkalization thiab ethericalization yog nqa tawm hauv qab cov kab mob organic yog cov tshuaj tiv thaiv nruab nrab (diluent) ntawm. Zoo li cov txheej txheem dej ntawm cov dej dej, cov kuab tshuaj kuj muaj ob theem ntawm alkalization thiab etherification nruab nrab ntawm ob theem no txawv. Qhov kom zoo dua ntawm txoj kev daws teeb meem yog tias nws rho cov txheej txheem ntawm alkali soaking, nias, thiab kev sib tsoo hauv cov txheej txheem dej, thiab kev sib tsoo thiab tag nrho yog txhua tus tau nqa tawm hauv lub Kneader; Qhov tsis zoo yog qhov ntsuas kub yog qhov tsis zoo, thiab qhov yuav tsum tau ua rau qhov chaw tsis zoo. , tus nqi siab dua.
Lub Sijhawm Post: Feb-14-2025