Njengesibophezelo esiyinhloko sezinto zokwenziwa kwe-electrode ezingezinhle ezisekelwe emanzini, imikhiqizo ye-CMC isetshenziswa kabanzi ngabakhiqizi bamabhethri basekhaya nabangaphandle.Inani elifanele le-binder lingathola umthamo webhethri omkhulu uma kuqhathaniswa, impilo yomjikelezo omude kanye nokumelana okuphansi kwangaphakathi.
I-Binder ingenye yezinto ezibalulekile ezisizayo kumabhethri e-lithium-ion.Iwumthombo oyinhloko wezakhiwo zemishini yawo wonke ama-electrode futhi inomthelela obalulekile enqubweni yokukhiqiza i-electrode kanye nokusebenza kwe-electrochemical kwebhethri.Isibopho ngokwaso asinawo amandla futhi sithatha ingxenye encane kakhulu ebhethrini.
Ngaphezu kwezakhiwo zokunamathisela zezibophezelo ezijwayelekile, izinto zokuhlanganisa ibhethri ye-lithium-ion yebhethri nazo zidinga ukuthi zikwazi ukumelana nokuvuvukala nokugqwala kwe-electrolyte, kanye nokumelana nokugqwala kwe-electrochemical ngesikhathi sokushaja nokukhipha.Ihlala izinzile ebangeni le-voltage esebenzayo, ngakho-ke azikho izinto eziningi ze-polymer ezingasetshenziswa njengezibophezelo ze-electrode zamabhethri e-lithium-ion.
Kunezinhlobo ezintathu eziyinhloko zokuhlanganisa ibhethri ye-lithium-ion ezisetshenziswa kabanzi njengamanje: i-polyvinylidene fluoride (PVDF), i-styrene-butadiene rubber (SBR) emulsion kanye ne-carboxymethyl cellulose (CMC).Ngaphezu kwalokho, i-polyacrylic acid (PAA), izibophezelo zasemanzini ezine-polyacrylonitrile (PAN) kanye ne-polyacrylate njengezingxenye eziyinhloko nazo zithatha imakethe ethile.
Izici ezine ze-CMC yezinga lebhethri
Ngenxa yokungancibiliki kahle kwamanzi kwesakhiwo se-asidi se-carboxymethyl cellulose, ukuze kusetshenziswe kangcono, i-CMC iwumsebenzi osetshenziswa kabanzi ekukhiqizeni amabhethri.
Njengesibophezelo esiyinhloko sezinto zokwenziwa kwe-electrode ezingezinhle ezisekelwe emanzini, imikhiqizo ye-CMC isetshenziswa kabanzi ngabakhiqizi bamabhethri basekhaya nabangaphandle.Inani elifanele le-binder lingathola umthamo webhethri omkhulu uma kuqhathaniswa, impilo yomjikelezo omude kanye nokumelana okuphansi kwangaphakathi.
Izici ezine ze-CMC yilezi:
Okokuqala, i-CMC ingenza umkhiqizo ube yi-hydrophilic futhi uncibilike, uncibilike ngokuphelele emanzini, ngaphandle kwemicu yamahhala nokungcola.
Okwesibili, izinga lokufaka esikhundleni lifana futhi i-viscosity izinzile, enganikeza i-viscosity ezinzile nokunamathela.
Okwesithathu, khiqiza imikhiqizo ehlanzekile enokuqukethwe kwe-ion yensimbi ephansi.
Okwesine, umkhiqizo unokuhambisana okuhle ne-SBR latex nezinye izinto.
I-CMC sodium carboxymethyl cellulose esetshenziswe ebhethrini ithuthukise ngokufanelekile umphumela wayo wokusetshenziswa, futhi ngesikhathi esifanayo ihlinzeka ngokusebenza kahle kokusetshenziswa, nomphumela wokusetshenziswa wamanje.
Iqhaza le-CMC kumabhethri
I-CMC iwumphumela we-carboxymethylated we-cellulose, ovame ukulungiswa ngokuphendula i-cellulose yemvelo nge-caustic alkali ne-monochloroacetic acid, futhi isisindo sayo samangqamuzana sisuka ezinkulungwaneni siye ezigidini.
I-CMC iyimpushana emhlophe kuya kokuphuzi okukhanyayo, imbudumbudu noma i-fibrous substance, ene-hygroscopicity eqinile futhi encibilika kalula emanzini.Uma ingathathi hlangothi noma i-alkaline, isisombululo siwuketshezi olune-viscosity ephezulu.Uma ishisiswe ngaphezu kuka-80 ℃ isikhathi eside, i-viscosity izokwehla futhi ngeke ingancibiliki emanzini.Iba nsundu uma ishisiswe ibe ngu-190-205°C, futhi i-carbonize uma ishise ibe ngu-235-248°C.
Ngenxa yokuthi i-CMC inemisebenzi yokuqina, ukuhlanganisa, ukugcinwa kwamanzi, i-emulsification kanye nokumiswa kwisisombululo esinamanzi, isetshenziswa kabanzi emkhakheni we-ceramics, ukudla, izimonyo, ukuphrinta nokudaya, ukwenza amaphepha, izindwangu, okokunamathela, okunamathelayo kanye nemithi, high- i-ceramics yokuphela kanye namabhethri e-lithium Inkambu yenza cishe u-7%, owaziwa ngokuthi "industrial monosodium glutamate".
NgokuqondileI-CMCkubhethri, imisebenzi ye-CMC yilena: ukuhlakaza i-electrode negative esebenzayo impahla kanye ne-ejenti conductive;ukuqina kanye nomphumela wokulwa ne-sedimentation ku-slurry engalungile ye-electrode;ukusiza ukuhlanganisa;ukuzinzisa ukusebenza kokucubungula kwe-electrode nokusiza ukuthuthukisa umjikelezo webhethri Ukusebenza;thuthukisa amandla e-peel wesiqephu sesigxobo, njll.
Ukusebenza nokukhetha kwe-CMC
Ukwengeza i-CMC lapho wenza i-electrode slurry kungakhuphula i-viscosity ye-slurry futhi kuvimbele udaka ekuzinzeni.I-CMC izobolisa ama-ion e-sodium nama-anions esixazululweni esinamanzi, futhi i-viscosity yeglue ye-CMC izokwehla ngokunyuka kwezinga lokushisa, okulula ukumunca umswakama futhi inokunwebeka okumpofu.
I-CMC ingadlala indima enhle kakhulu ekuhlakazweni kwegraphite ye-electrode negative.Njengoba inani le-CMC likhuphuka, imikhiqizo yalo yokubola izonamathela ebusweni bezinhlayiya ze-graphite, futhi izinhlayiya ze-graphite zizoxoshana ngenxa yamandla e-electrostatic, ukufeza umphumela omuhle wokuhlakazeka.
Ububi obusobala be-CMC ukuthi ayinamandla.Uma yonke i-CMC isetshenziswa njengesibophezelo, i-electrode engalungile ye-graphite izowa ngesikhathi sokucindezela nokusika ucezu lwesigxobo, okuzobangela ukulahlekelwa okukhulu kwempushana.Ngesikhathi esifanayo, i-CMC ithintwa kakhulu isilinganiso sezinto ze-electrode kanye nenani le-pH, futhi ishidi le-electrode lingase liqhekeke ngesikhathi sokushaja nokukhipha, okuthinta ngokuqondile ukuphepha kwebhethri.
Ekuqaleni, i-binder esetshenziselwa ukugqugquzela ama-electrode angalungile kwakuyi-PVDF nezinye izibophezelo ezisekelwe kuwoyela, kodwa uma kucatshangelwa ukuvikelwa kwemvelo nezinye izici, sekuyinto evamile ukusebenzisa ama-binder asekelwe emanzini kuma-electrode angalungile.
I-binder ephelele ayikho, zama ukukhetha i-binder ehlangabezana nezidingo zokucubungula ngokomzimba kanye ne-electrochemical.Ngokuthuthukiswa kobuchwepheshe bebhethri ye-lithium, kanye nezindleko kanye nezindaba zokuvikela imvelo, ama-binder asekelwe emanzini ekugcineni azothatha indawo yokuhlanganisa okusekelwe kumafutha.
I-CMC izinqubo ezimbili ezinkulu zokukhiqiza
Ngokusho kwemidiya ehlukene ye-etherification, ukukhiqizwa kwezimboni ze-CMC kungahlukaniswa ngezigaba ezimbili: indlela esekelwe emanzini kanye nendlela esekelwe ku-solvent.Indlela yokusebenzisa amanzi njengendlela yokusabela ibizwa ngokuthi indlela ye-water medium, esetshenziselwa ukukhiqiza i-CMC ye-alkaline ephakathi nendawo neyezinga eliphansi.Indlela yokusebenzisa i-solvent ye-organic njengendlela yokusabela ibizwa ngokuthi indlela ye-solvent, elungele ukukhiqizwa kwe-CMC ephakathi nephezulu.Lokhu kusabela okubili kwenziwa ku-kneader, okuyingxenye yenqubo yokuxova futhi okwamanje iyindlela eyinhloko yokukhiqiza i-CMC.
Indlela ephakathi namanzi: inqubo yokukhiqiza yezimboni yangaphambilini, indlela iwukusabela i-alkali cellulose kanye ne-etherification ejenti ngaphansi kwezimo ze-alkali yamahhala namanzi, esetshenziselwa ukulungisa imikhiqizo ye-CMC ephakathi nendawo nesezingeni eliphansi, njengezihlanzi kanye nama-textile sizeing agents. .Inzuzo yendlela ye-water medium ukuthi izidingo zemishini zilula futhi izindleko ziphansi;okubi ukuthi ngenxa yokuntuleka kwenani elikhulu le-liquid medium, ukushisa okukhiqizwa ukusabela kwandisa izinga lokushisa futhi kusheshise isivinini sokusabela ohlangothini, okuholela ekusebenzeni kahle kwe-etherification kanye nekhwalithi yomkhiqizo ompofu.
Indlela yokuncibilikisa;eyaziwa nangokuthi indlela ye-organic solvent, ihlukaniswe yaba indlela yokuxova kanye nendlela ye-slurry ngokuya ngenani le-reaction diluent.Isici sawo esiyinhloko ukuthi ukusabela kwe-alkalization kanye ne-etherification kwenziwa ngaphansi kwesimo se-solvent ephilayo njenge-reaction medium (diluent) ye.Njengenqubo yokusabela yendlela yamanzi, indlela yokuncibilikisa nayo iqukethe izigaba ezimbili ze-alkalization kanye ne-etherification, kodwa indlela yokusabela yalezi zigaba ezimbili ihlukile.Inzuzo yendlela ye-solvent iwukuthi ishiya izinqubo zokucwiliswa kwe-alkali, ukucindezela, ukuchoboza, nokuguga okungokwemvelo endleleni yamanzi, futhi i-alkalization kanye ne-etherification konke kwenziwa ku-kneader;okubi ukuthi izinga lokushisa liphansi kakhulu, futhi izidingo zesikhala zimbi kakhulu.,izindleko eziphezulu.
Isikhathi sokuthumela: Jan-05-2023