Focus on Cellulose ethers

Kev siv CMC Binder hauv cov roj teeb

Raws li lub ntsiab binder ntawm dej-raws li tsis zoo electrode cov ntaub ntawv, CMC cov khoom yog dav siv los ntawm domestic thiab txawv teb chaws roj teeb manufacturers. Qhov zoo tshaj plaws ntawm cov binder tuaj yeem tau txais cov roj teeb uas muaj peev xwm loj, lub neej voj voog ntev thiab tsis muaj kev tiv thaiv sab hauv.

Binder yog ib qho ntawm cov khoom siv tseem ceeb hauv cov roj teeb lithium-ion. Nws yog lub hauv paus tseem ceeb ntawm cov khoom siv hluav taws xob ntawm tag nrho cov electrode thiab muaj kev cuam tshuam tseem ceeb ntawm cov txheej txheem ntawm cov khoom siv hluav taws xob thiab kev ua haujlwm ntawm electrochemical ntawm lub roj teeb. Lub binder nws tus kheej tsis muaj peev xwm thiab occupies ib feem me me nyob rau hauv lub roj teeb.

Ntxiv nrog rau cov khoom nplaum ntawm cov binders dav dav, cov ntaub ntawv lithium-ion roj teeb electrode yuav tsum muaj peev xwm tiv taus qhov o thiab corrosion ntawm electrolyte, nrog rau tiv taus electrochemical corrosion thaum lub sij hawm them thiab tawm. Nws tseem nyob ruaj khov nyob rau hauv kev ua haujlwm voltage ntau, yog li tsis muaj ntau cov ntaub ntawv polymer uas tuaj yeem siv los ua electrode binders rau lithium-ion roj teeb.

Muaj peb yam tseem ceeb ntawm lithium-ion roj teeb binders uas tau siv dav rau tam sim no: polyvinylidene fluoride (PVDF), styrene-butadiene roj hmab (SBR) emulsion thiab carboxymethyl cellulose (CMC). Tsis tas li ntawd, polyacrylic acid (PAA), Dej-raws li binders nrog polyacrylonitrile (PAN) thiab polyacrylate raws li cov khoom tseem ceeb kuj nyob hauv ib qho kev lag luam.

Plaub yam ntxwv ntawm roj teeb-theem CMC

Vim yog cov dej tsis zoo ntawm cov kua qaub ntawm carboxymethyl cellulose, thiaj li yuav siv tau zoo dua, CMC yog cov khoom siv dav siv hauv cov roj teeb ntau lawm.

Raws li lub ntsiab binder ntawm dej-raws li tsis zoo electrode cov ntaub ntawv, CMC cov khoom yog dav siv los ntawm domestic thiab txawv teb chaws roj teeb manufacturers. Qhov zoo tshaj plaws ntawm cov binder tuaj yeem tau txais cov roj teeb uas muaj peev xwm loj, lub neej voj voog ntev thiab tsis muaj kev tiv thaiv sab hauv.

Plaub tus yam ntxwv ntawm CMC yog:

Ua ntej, CMC tuaj yeem ua cov khoom siv hydrophilic thiab soluble, soluble tag nrho hauv dej, tsis muaj fibers dawb thiab impurities.

Qhov thib ob, qhov kev hloov pauv yog qhov sib xws thiab cov viscosity ruaj khov, uas tuaj yeem muab cov viscosity ruaj khov thiab adhesion.

Thib peb, tsim cov khoom siv high-purity nrog cov ntsiab lus hlau ion tsawg.

Plaub, cov khoom muaj kev sib raug zoo nrog SBR latex thiab lwm yam ntaub ntawv.

CMC sodium carboxymethyl cellulose siv nyob rau hauv lub roj teeb tau zoo txhim kho nws cov txiaj ntsig siv, thiab tib lub sijhawm muab nws nrog kev siv zoo, nrog rau kev siv tam sim no.

Lub luag haujlwm ntawm CMC hauv cov roj teeb

CMC yog ib qho carboxymethylated derivative ntawm cellulose, uas feem ntau yog npaj los ntawm reacting natural cellulose nrog caustic alkali thiab monochloroacetic acid, thiab nws molecular hnyav li ntawm txhiab mus rau lab.

CMC yog cov hmoov dawb mus rau lub teeb daj, granular lossis fibrous tshuaj, uas muaj zog hygroscopicity thiab yooj yim soluble hauv dej. Thaum nws yog nruab nrab lossis alkaline, cov tshuaj yog cov kua viscosity siab. Yog tias nws tau kub siab tshaj 80 ℃ rau lub sijhawm ntev, lub viscosity yuav txo qis thiab nws yuav insoluble hauv dej. Nws hloov xim av thaum rhuab mus rau 190-205 ° C, thiab carbonizes thaum rhuab mus rau 235-248 ° C.

Vim tias CMC muaj lub luag haujlwm ntawm thickening, bonding, dej tuav, emulsification thiab ncua kev kawm ntawv nyob rau hauv aqueous tov, nws yog dav siv nyob rau hauv lub teb ntawm ceramics, zaub mov, tshuaj pleev ib ce, luam ntawv thiab dyeing, papermaking, textiles, coatings, adhesives thiab tshuaj, high- kawg ceramics thiab lithium roj teeb Lub teb suav txog li 7%, feem ntau hu ua "kev lag luam monosodium glutamate".

Tshwj xeebCMChauv roj teeb, CMC lub luag haujlwm yog: dispersing qhov tsis zoo electrode active khoom thiab conductive tus neeg saib xyuas; thickening thiab anti-sedimentation nyhuv ntawm qhov tsis zoo electrode slurry; pab kev sib txuas; stabilizing kev ua tau zoo ntawm cov electrode thiab pab txhim kho lub roj teeb voj voog Performance; txhim kho lub tev lub zog ntawm tus ncej, thiab lwm yam.

CMC kev ua tau zoo thiab kev xaiv

Ntxiv CMC thaum ua cov electrode slurry tuaj yeem ua kom cov viscosity ntawm slurry thiab tiv thaiv cov slurry los ntawm kev daws teeb meem. CMC yuav decompose sodium ions thiab anions nyob rau hauv aqueous tov, thiab lub viscosity ntawm CMC kua nplaum yuav txo nrog qhov kub thiab txias, uas yog ib qho yooj yim mus nqus noo noo thiab tsis zoo elasticity.

CMC tuaj yeem ua lub luag haujlwm zoo heev hauv kev tawg ntawm qhov tsis zoo electrode graphite. Raws li tus nqi ntawm CMC nce, nws cov khoom decomposition yuav ua raws li qhov chaw ntawm graphite hais, thiab cov graphite hais yuav tawm tsam ib leeg vim electrostatic quab yuam, ua tiav cov nyhuv dispersion zoo.

Qhov pom tseeb qhov tsis zoo ntawm CMC yog tias nws yog nkig. Yog tias tag nrho CMC siv los ua cov ntawv khi, cov graphite tsis zoo electrode yuav tawg thaum lub sij hawm nias thiab txiav cov txheej txheem ntawm tus ncej, uas yuav ua rau cov hmoov tsis zoo. Nyob rau tib lub sijhawm, CMC cuam tshuam zoo heev los ntawm qhov sib piv ntawm cov khoom siv electrode thiab pH tus nqi, thiab daim ntawv electrode tuaj yeem tawg thaum them thiab tawm, uas cuam tshuam ncaj qha rau kev nyab xeeb ntawm lub roj teeb.

Thaum xub thawj, cov binder siv rau qhov tsis zoo electrode nplawm yog PVDF thiab lwm yam roj-raws li binders, tab sis xav txog kev tiv thaiv ib puag ncig thiab lwm yam, nws tau dhau los ua qhov tseem ceeb rau kev siv dej-raws li binders rau qhov tsis zoo electrodes.

Lub zoo meej binder tsis muaj nyob, sim xaiv ib tug binder uas ua tau raws li lub cev ua thiab electrochemical yuav tsum tau. Nrog rau txoj kev loj hlob ntawm lithium roj teeb technology, nrog rau cov nqi thiab ib puag ncig tiv thaiv teeb meem, dej-raws li binders yuav nws thiaj li hloov roj-raws li binders.

CMC ob txoj kev tsim khoom loj

Raws li kev tshaj tawm etherification sib txawv, kev tsim khoom lag luam ntawm CMC tuaj yeem muab faib ua ob pawg: dej-raws li txoj kev thiab cov txheej txheem hnyav. Txoj kev siv dej raws li qhov nruab nrab cov tshuaj tiv thaiv yog hu ua dej nruab nrab txoj kev, uas yog siv los tsim alkaline nruab nrab thiab qis-qib CMC. Cov txheej txheem ntawm kev siv cov kuab tshuaj organic raws li qhov nruab nrab cov tshuaj tiv thaiv yog hu ua cov txheej txheem hnyav, uas yog tsim rau cov khoom nruab nrab thiab qib siab CMC. Ob qhov kev cuam tshuam no tau ua tiav hauv lub tshuab kneader, uas yog cov txheej txheem kneading thiab tam sim no yog txoj hauv kev tseem ceeb rau kev tsim CMC.

Cov txheej txheem dej nruab nrab: txheej txheem kev tsim khoom ua ntej dhau los, txoj hauv kev yog los ua cov tshuaj alkali cellulose thiab etherification tus neeg sawv cev nyob rau hauv cov xwm txheej ntawm cov alkali dawb thiab dej, uas yog siv los npaj cov khoom nruab nrab thiab qib qis CMC, xws li cov tshuaj ntxuav tes thiab cov khoom siv textile sizing tos . Qhov zoo ntawm cov txheej txheem dej nruab nrab yog tias cov cuab yeej siv tau yooj yim thiab tus nqi qis; qhov tsis zoo yog vim qhov tsis muaj qhov loj ntawm cov kua nruab nrab, cov cua sov uas tsim los ntawm cov tshuaj tiv thaiv ua rau kom qhov kub thiab txias thiab ua kom nrawm nrawm ntawm cov tshuaj tiv thaiv sab, ua rau tsis muaj etherification efficiency thiab cov khoom tsis zoo.

Txoj kev hnyav; tseem hu ua organic solvent method, nws muab faib rau hauv txoj kev kneading thiab slurry txoj kev raws li tus nqi ntawm cov tshuaj tiv thaiv diluent. Nws lub ntsiab feature yog hais tias lub alkalization thiab etherification cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv lub mob ntawm ib tug organic hnyav raws li cov tshuaj tiv thaiv nruab nrab (diluent) ntawm. Zoo li cov txheej txheem tshuaj tiv thaiv ntawm txoj kev dej, cov txheej txheem hnyav kuj muaj ob theem ntawm alkalization thiab etherification, tab sis cov tshuaj tiv thaiv nruab nrab ntawm ob theem no txawv. Qhov kom zoo dua ntawm txoj kev hnyav yog tias nws tshem tawm cov txheej txheem ntawm alkali soaking, nias, crushing, thiab aging inherent nyob rau hauv cov dej txoj kev, thiab cov alkalization thiab etherification yog tag nrho cov nyob rau hauv lub kneader; qhov tsis zoo yog tias qhov ntsuas kub tswj tau tsis zoo, thiab qhov chaw yuav tsum tau ua tsis zoo. , tus nqi siab dua.


Post lub sij hawm: Jan-05-2023
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