Joalo ka setlamo se seholo sa lisebelisoa tsa elektrode tse mpe tse thehiloeng metsing, lihlahisoa tsa CMC li sebelisoa haholo ke bahlahisi ba betri ba malapeng le ba kantle ho naha. Palo e nepahetseng ea binder e ka fumana matla a betri a batlang a le kholo, bophelo ba potoloho e telele le khanyetso e tlase ea kahare.
Binder ke e 'ngoe ea lisebelisoa tsa bohlokoa tse thusang libeteri tsa lithium-ion. Ke mohloli o ka sehloohong oa thepa ea mechine ea electrode eohle 'me e na le tšusumetso ea bohlokoa ts'ebetsong ea tlhahiso ea electrode le ts'ebetso ea electrochemical ea betri. Binder ka boeona ha e na bokhoni mme e nka karolo e nyane haholo ka har'a betri.
Ntle le thepa ea sekhomaretsi ea li-binders tse akaretsang, lisebelisoa tsa sekontiri sa li-electrode tsa lithium-ion li boetse li hloka ho khona ho mamella ho ruruha le ho bola ha electrolyte, hammoho le ho mamella ho bola ha electrochemical nakong ea tefiso le ho tsoa. E ntse e tsitsitse mofuteng oa motlakase o sebetsang, kahoo ha ho na lisebelisoa tse ngata tsa polymer tse ka sebelisoang e le li-electrode binders bakeng sa libeteri tsa lithium-ion.
Ho na le mefuta e meraro ea mantlha ea li-betri tsa lithium-ion tse tlamang tse sebelisoang haholo hajoale: polyvinylidene fluoride (PVDF), styrene-butadiene rabara (SBR) emulsion le carboxymethyl cellulose (CMC). Ntle le moo, polyacrylic acid (PAA), li-binders tse thehiloeng metsing tse nang le polyacrylonitrile (PAN) le polyacrylate joalo ka likarolo tsa mantlha le tsona li lula 'marakeng o itseng.
Litšobotsi tse 'ne tsa CMC ea boemo ba betri
Ka lebaka la ho haella ha metsi ka har'a sebopeho sa asiti ea carboxymethyl cellulose, molemong oa ho e sebelisa hamolemo, CMC ke sesebelisoa se sebelisoang haholo tlhahisong ea betri.
Joalo ka setlamo se seholo sa lisebelisoa tsa elektrode tse mpe tse thehiloeng metsing, lihlahisoa tsa CMC li sebelisoa haholo ke bahlahisi ba betri ba malapeng le ba kantle ho naha. Palo e nepahetseng ea binder e ka fumana matla a betri a batlang a le kholo, bophelo ba potoloho e telele le khanyetso e tlase ea kahare.
Litšobotsi tse 'ne tsa CMC ke:
Ntlha ea pele, CMC e ka etsa hore sehlahisoa se be hydrophilic le ho qhibiliha, se qhibilihe ka ho feletseng metsing, ntle le likhoele tse sa lefelloeng le litšila.
Ntlha ea bobeli, tekanyo ea ho nkela sebaka e tšoana 'me viscosity e tsitsitse, e ka fanang ka viscosity e tsitsitseng le ho khomarela.
Ntlha ea boraro, hlahisa lihlahisoa tse hloekileng tse nang le li-ion tse tlaase tsa tšepe.
Ea bone, sehlahisoa se lumellana hantle le SBR latex le lisebelisoa tse ling.
CMC sodium carboxymethyl cellulose e sebelisitsoeng ka betri e ntlafalitse ka mokhoa o nepahetseng ts'ebeliso ea eona, 'me ka nako e ts'oanang e fana ka ts'ebetso e ntle ea ts'ebeliso, ka phello ea ts'ebeliso ea hajoale.
Karolo ea CMC ka libeteri
CMC ke karolo ea carboxymethylated derivative ea cellulose, eo hangata e lokiselitsoeng ka ho arabela cellulose ea tlhaho ka caustic alkali le monochloroacetic acid, 'me boima ba eona ba molek'hule bo tloha ho likete ho isa ho limilione.
CMC ke phofo e tšoeu ho isa ho e khanyang, granular kapa fibrous substance, e nang le hygroscopicity e matla 'me e qhibiliha habonolo metsing. Ha e sa nke lehlakore kapa alkaline, tharollo ke mokelikeli o phahameng oa viscosity. Haeba e futhumetse ka holimo ho 80 ℃ nako e telele, viscosity e tla fokotseha 'me e ke ke ea qhibiliha ka metsing. E fetoha sootho ha e futhumala ho 190-205 ° C, 'me carbonizes ha e futhumala ho 235-248 ° C.
Hobane CMC e na le mesebetsi ea ho tiisa, ho kopanya, ho boloka metsi, emulsification le ho emisoa ka tharollo ea metsi, e sebelisoa haholo masimong a ceramic, lijo, litlolo, khatiso le ho daea, ho etsa pampiri, masela, liaparo, likhomaretsi le meriana, li-ceramics tsa ho qetela le libeteri tsa lithium The field account for about 7%, eo hangata e tsejoang e le "industrial monosodium glutamate".
Ka ho tobaCMCka betri, mesebetsi ea CMC ke: qhalakanya eleketrode mpe e sebetsang lintho tse bonahalang le conductive moemeli; thickening le anti-sedimentation phello e mpe eleketrode slurry; ho thusa ho kopanya; ho tsitsisa ts'ebetso ea ts'ebetso ea electrode le ho thusa ho ntlafatsa ts'ebetso ea potoloho ea betri Ts'ebetso; ntlafatsa matla a peel ea sengoathoana sa palo, joalo-joalo.
Ts'ebetso ea CMC le khetho
Ho eketsa CMC ha ho etsoa slurry ea electrode ho ka eketsa viscosity ea slurry le ho thibela slurry hore e se ke ea lula. CMC e tla senya li-ion tsa sodium le anions ka tharollo e nang le metsi, 'me viscosity ea sekhomaretsi sa CMC e tla fokotseha ka ho eketseha ha mocheso, ho leng bonolo ho monya mongobo le ho ba le elasticity e fokolang.
CMC ka phetha karolo e ntle haholo ho hasana ha eleketrode graphite mpe. Ha palo ea CMC e ntse e eketseha, lihlahisoa tsa eona tsa ho bola li tla khomarela holim'a likaroloana tsa graphite, 'me likaroloana tsa graphite li tla leleka ka lebaka la matla a electrostatic, ho finyella phello e ntle ea ho hasana.
Phoso e totobetseng ea CMC ke hore e batla e fokola. Haeba CMC eohle e sebelisoa e le binder, electrode e fosahetseng ea graphite e tla oa nakong ea ho hatella le ho itšeha karolo ea palo, e tla baka tahlehelo e tebileng ea phofo. Ka nako e ts'oanang, CMC e angoa haholo ke karo-karolelano ea lisebelisoa tsa elektrode le boleng ba pH, mme letlapa la eleketrode le ka 'na la peperana nakong ea ho tjhaja le ho qhala, e amang polokeho ea betri ka kotloloho.
Qalong, setlamo se neng se sebelisetsoa ho hlohlelletsa li-electrode tse mpe e ne e le PVDF le li-binders tse ling tse thehiloeng ka oli, empa ha ho nahanoa ka tšireletso ea tikoloho le lintlha tse ling, e se e tloaelehile ho sebelisa li-binders tse thehiloeng metsing bakeng sa li-electrode tse mpe.
Setlama se phethahetseng ha se eo, leka ho khetha setlama se kopanang le litlhoko tsa 'mele le litlhokahalo tsa electrochemical. Ka nts'etsopele ea theknoloji ea lithium betri, hammoho le litšenyehelo le litaba tsa ts'ireletso ea tikoloho, li-binders tse thehiloeng metsing li tla qetella li nkela li-binders tse thehiloeng ka oli sebaka.
CMC mekhoa e 'meli e meholo ea tlhahiso
Ho latela mecha ea litaba e fapaneng ea etherification, tlhahiso ea indasteri ea CMC e ka aroloa ka mekhahlelo e 'meli: mokhoa o thehiloeng metsing le mokhoa o thehiloeng ho solvent. Mokhoa oa ho sebelisa metsi e le mokhoa oa ho arabela o bitsoa mokhoa oa mokhoa oa metsi, o sebelisetsoang ho hlahisa alkaline e mahareng le ea boemo bo tlaase ba CMC. Mokhoa oa ho sebelisa solvent ea manyolo e le mokhoa oa ho arabela o bitsoa mokhoa oa solvent, o loketseng tlhahiso ea CMC e mahareng le e phahameng. Maikutlo ana a mabeli a etsoa ka kneader, eo e leng ea ts'ebetso ea ho luba 'me hajoale ke mokhoa o ka sehloohong oa ho hlahisa CMC.
Metsi a mahareng mokhoa: mokhoa oa pele oa tlhahiso ea indasteri, mokhoa ke ho itšoara ka selulose ea alkali le moemeli oa etherification tlas'a maemo a alkali ea mahala le metsi, e sebelisetsoang ho lokisetsa lihlahisoa tsa CMC tse mahareng le tse tlaase, tse kang li-detergents le li-textile sizing agents Ema. . Molemo oa mokhoa oa ho sebelisa metsi ke hore litlhoko tsa thepa li batla li le bonolo 'me litšenyehelo li tlaase; bothata ke hore ka lebaka la ho haella ha palo e kholo ea mokelikeli, mocheso o hlahisoang ke karabelo o eketsa mocheso le ho potlakisa lebelo la liketso tsa mahlakoreng, ho fella ka katleho e tlaase ea etherification le boleng bo tlaase ba sehlahisoa.
Mokhoa oa ho qhibiliha; E boetse e tsejoa e le mokhoa oa ho hlapolla ka manyolo, e arotsoe ka mokhoa oa ho luba le mokhoa oa slurry ho latela bongata ba karabelo ea diluent. Tšobotsi ea eona e ka sehloohong ke hore alkalization le etherification reactions li etsoa tlas'a boemo ba solvent organic e le karabelo seaplane (diluent) ea. Joalo ka ts'ebetso ea karabelo ea mokhoa oa metsi, mokhoa oa ho qhibiliha o boetse o na le mekhahlelo e 'meli ea alkalization le etherification, empa mokhoa oa karabelo oa mekhahlelo ena e' meli o fapane. Molemo oa mokhoa oa ho qhibiliha ke hore o tlohela mekhoa ea ho kolobisa ha alkali, ho hatella, ho senya le ho tsofala ka tlhaho ho mokhoa oa metsi, 'me alkalization le etherification kaofela li etsoa ka kneader; bothata ke hore taolo ea mocheso e batla e fokola, 'me litlhoko tsa sebaka li batla li fokola. , litšenyehelo tse phahameng.
Nako ea poso: Jan-05-2023