Seyakanyanya binder yemvura-based negative electrode zvinhu, CMC zvigadzirwa zvinoshandiswa zvakanyanya nevanogadzira mabhatiri epamba nekunze. Huwandu hwakakwana hwebhainda hunogona kuwana huwandu hwakakura hwebhatiri, hupenyu hurefu hwekutenderera uye kushomeka kwemukati kuramba.
Binder ndechimwe chezvinhu zvakakosha zvekubatsira zvinoshanda mumabhatiri e lithium-ion. Ndiyo huru sosi yemagetsi emagetsi ese e electrode uye ine kukosha kwakakosha pakugadzirwa kweiyo electrode uye mashandiro emagetsi ebhatiri. Iyo binder pachayo haina simba uye inotora chikamu chidiki kwazvo mubhatiri.
Pamusoro pezvinonamira zvivakwa zve general binders, lithium-ion bhatiri electrode binder zvinhu zvinodawo kukwanisa kushingirira kuzvimba nekuora kweiyo electrolyte, pamwe nekushingirira corrosion ye electrochemical panguva yekuchaja uye kubuda. Iyo inoramba yakagadzikana mumagetsi ekushanda, saka hapana zvakawanda zvepolymer zvinhu zvinogona kushandiswa se electrode binders kune lithium-ion mabhatiri.
Kune marudzi matatu makuru e lithium-ion bhatiri binders ari kushandiswa zvakanyanya parizvino: polyvinylidene fluoride (PVDF), styrene-butadiene rubber (SBR) emulsion uye carboxymethyl cellulose (CMC). Pamusoro pezvo, polyacrylic acid (PAA), Mvura-based binders ine polyacrylonitrile (PAN) uye polyacrylate sezvinhu zvikuru zvinotorawo imwe musika.
Maitiro mana ebhatiri-level CMC
Nekuda kwekusanyungudika kwemvura kweiyo acid chimiro checarboxymethyl cellulose, kuti ishandise zvirinani, CMC chinhu chinoshandiswa zvakanyanya mukugadzirwa kwebhatiri.
Seyakanyanya binder yemvura-based negative electrode zvinhu, CMC zvigadzirwa zvinoshandiswa zvakanyanya nevanogadzira mabhatiri epamba nekunze. Huwandu hwakakwana hwebhainda hunogona kuwana huwandu hwakakura hwebhatiri, hupenyu hurefu hwekutenderera uye kushomeka kwemukati kuramba.
Iwo mana maitiro eCMC ndeaya:
Chekutanga, CMC inogona kuita chigadzirwa hydrophilic uye soluble, soluble zvachose mumvura, pasina mahara fiber uye tsvina.
Chechipiri, dhigirii rekutsinhanisa yunifomu uye viscosity yakagadzikana, iyo inogona kupa yakagadzikana viscosity uye adhesion.
Chechitatu, gadzira zvigadzirwa zvemhando yepamusoro zvine yakaderera simbi ion content.
Chechina, chigadzirwa chine kuenderana kwakanaka neSBR latex uye zvimwe zvinhu.
Iyo CMC sodium carboxymethyl cellulose inoshandiswa mubhatiri yakavandudza mashandisiro ayo, uye panguva imwechete inoipa kuita kwakanaka kwekushandisa, nekuita kwekushandisa ikozvino.
Basa reCMC mumabhatiri
CMC ndeye carboxymethylated derivative ye cellulose, iyo inowanzo gadzirirwa nekuita serusisiro yepanyama ine caustic alkali uye monochloroacetic acid, uye huremu hwayo hwemamorekuru hunobva kuzviuru kusvika kumamiriyoni.
CMC ivhu chena kusvika kuchiedza yero, granular kana fibrous substance, ine yakasimba hygroscopicity uye inonyungudika zviri nyore mumvura. Kana iine kwayakarerekera kana alkaline, mhinduro ndeye yakakwirira-viscosity mvura. Kana ichipisa pamusoro pe80 ℃ kwenguva yakareba, iyo viscosity inoderera uye haizonyungudika mumvura. Inoshanduka kuva shava kana ichipisa kusvika 190-205°C, uye carbonizes kana yapiswa kusvika 235-248°C.
Nekuti CMC ine mabasa ekukora, kubatanidza, kuchengetedza mvura, emulsification uye kumiswa mumvura ine aqueous solution, inoshandiswa zvakanyanya muminda yekeramics, chikafu, zvizorwa, kudhinda nekudhaya, kugadzira mapepa, machira, machira, zvinonamira nemishonga, yakakwirira- end Ceramics uye lithium mabhatiri Munda unotora 7%, inowanzozivikanwa se "industrial monosodium glutamate".
ZvakanangaCMCmubhatiri, mabasa eCMC ndeaya: kuparadzira iyo yakaipa electrode inoshanda zvinhu uye conductive mumiririri; thickening uye anti-sedimentation effect pane yakaipa electrode slurry; kubatsira kubatana; kudzikamisa mashandiro ekugadzirisa electrode uye kubatsira kuvandudza bhatiri kutenderera Performance; kunatsiridza kusimba kwepeel kwechidimbu chedanda, nezvimwe.
CMC kuita uye kusarudzwa
Kuwedzera CMC paunenge uchigadzira electrode slurry inogona kuwedzera viscosity ye slurry uye kudzivirira slurry kubva pakugadzirisa. CMC ichaora sodium ions uye anions mumushonga wemvura, uye viscosity yeCMC glue ichaderera nekuwedzera kwekushisa, iyo iri nyore kutora unyoro uye ine hurombo husina kunaka.
CMC inogona kuita basa rakanaka kwazvo mukupararira kwegetsi remagetsi graphite. Sezvo huwandu hweCMC huchiwedzera, zvigadzirwa zvayo zvekuora zvinonamatira kumusoro kwegraphite particles, uye magirafu zvimedu zvinodzosera mumwe nemumwe nekuda kwesimba remagetsi, kuwana yakanaka yekuparadzira.
Izvo zviri pachena zvakashata zveCMC ndezvekuti ine brittle. Kana CMC yese ikashandiswa sebhainda, iyo graphite negative electrode inodonha panguva yekutsikirira nekucheka kwepazi chidimbu, izvo zvinokonzeresa kurasikirwa kwehupfu. Panguva imwecheteyo, CMC inobatwa zvakanyanya nereshiyo ye electrode zvinhu uye pH kukosha, uye electrode sheet inogona kutsemuka panguva yekuchaja nekuburitsa, izvo zvinokanganisa zvakananga kuchengetedzwa kwebhatiri.
Pakutanga, bhainda raishandiswa kune negative electrode kubvongodza yaive PVDF uye mamwe mafuta-based binders, asi tichifunga nezvekuchengetedzwa kwezvakatipoteredza nezvimwe zvinhu, yave yakajairika kushandisa mvura-based binders kune negative electrode.
Iyo yakakwana binder haipo, edza kusarudza bhainda rinosangana nekugadzirwa kwemuviri uye electrochemical zvinodiwa. Nekuvandudzwa kwerithium bhatiri tekinoroji, pamwe nemutengo uye nyaya dzekuchengetedza zvakatipoteredza, mvura-based binders inozopedzisira yatsiva mafuta-based binders.
CMC maviri makuru ekugadzira maitiro
Zvinoenderana neakasiyana etherification midhiya, kugadzirwa kwemaindasitiri kweCMC kunogona kukamurwa kuita mapoka maviri: nzira yemvura-yakavakirwa uye nzira yekunyungudutsa. Iyo nzira yekushandisa mvura seyekuita svikiro inonzi nzira yemvura yepakati, iyo inoshandiswa kugadzira alkaline yepakati uye yakaderera-giredhi CMC. Nzira yekushandisa organic solvent seyekuita svikiro inonzi solvent method, iyo yakakodzera kugadzirwa kwepakati nepamusoro-giredhi CMC. Aya maitiro maviri anoitwa mukneader, inova nzira yekukanya uye parizvino ndiyo nzira huru yekugadzira CMC.
Mvura yepakati nzira: yekutanga maindasitiri ekugadzira maindasitiri, iyo nzira ndeyekuita alkali cellulose uye etherification mumiriri pasi pemamiriro emahara alkali nemvura, iyo inoshandiswa kugadzirira yepakati uye yakaderera-giredhi CMC zvigadzirwa, senge madhishi uye machira sizing agents Mirira. . Kubatsira kwemvura yepakati nzira ndeyekuti zvinodiwa zvemidziyo zviri nyore uye mutengo wakaderera; chakashata ndechekuti nekuda kwekushaikwa kwehuwandu hukuru hwepakati pemvura, kupisa kunokonzerwa nekuita kunowedzera tembiricha uye kunomhanyisa kukurumidza kwekuita kweparutivi, zvichikonzera kuderera kwe etherification uye hurombo hwechigadzirwa.
Solvent nzira; inozivikanwawo sekuti organic solvent nzira, yakakamurwa kuita yekukanya nzira uye slurry nzira zvichienderana nehuwandu hwekuita diluent. Chinhu chayo chikuru ndechekuti alkalization uye etherification maitiro anoitwa pasi pemamiriro eiyo organic solvent seyekuita svikiro (diluent) ye. Kufanana nekuita kwemaitiro emvura nzira, iyo yekunyungudutsa nzira inewo nhanho mbiri dze alkalization uye etherification, asi maitiro ekuita ematanho maviri aya akasiyana. Kubatsira kweiyo nzira yekunyungudutsa ndeyekuti inosiya maitiro eiyo alkali soaking, kudzvanya, kupwanya, uye kuchembera kunowanikwa munzira yemvura, uye alkalization uye etherification zvese zvinoitwa mukneader; chakashata ndechekuti tembiricha controllability ishoma, uye nzvimbo inodiwa ishoma. ,mutengo wakakwira.
Nguva yekutumira: Jan-05-2023