Njengombhobho oyintloko wezinto ezingalunganga ze-electrode ezisekelwe emanzini, iimveliso ze-CMC zisetyenziswa ngokubanzi ngabavelisi bebhetri basekhaya nabangaphandle. Elona xabiso lifanelekileyo lesibophelelo linokufumana umthamo omkhulu webhetri, ubomi bomjikelo omde kunye nokunganyangeki okuphantsi kwangaphakathi.
Ibhinder yenye yezinto ezibalulekileyo ezincedisayo kwiibhetri ze-lithium-ion. Ingumthombo oyintloko weempawu zomatshini we-electrode yonke kwaye inempembelelo ebalulekileyo kwinkqubo yokuvelisa i-electrode kunye nokusebenza kwe-electrochemical yebhetri. Isibophelelo ngokwaso asinamthamo kwaye sithatha indawo encinci kakhulu kwibhetri.
Ukongeza kwiipropathi zokubambelela kwi-binders jikelele, i-lithium-ion ibhetri ye-binder ye-binder iphinda ikwazi ukumelana nokuvuvukala kunye nokugqwala kwe-electrolyte, kunye nokumelana ne-electrochemical corrosion ngexesha lokuhlawula kunye nokukhutshwa. Ihlala izinzile kuluhlu lwamandla ombane osebenzayo, ngoko ke akukho zixhobo ezininzi zepolymer ezinokuthi zisetyenziswe njengezibophelelo ze-electrode kwiibhetri ze-lithium-ion.
Kukho iintlobo ezintathu eziphambili ze-lithium-ion battery binders ezisetyenziswa ngokubanzi ngoku: i-polyvinylidene fluoride (PVDF), i-styrene-butadiene rubber (SBR) emulsion kunye ne-carboxymethyl cellulose (CMC). Ukongeza, i-polyacrylic acid (PAA), izibophelelo ezisekelwe emanzini kunye ne-polyacrylonitrile (PAN) kunye ne-polyacrylate njengezona zinto ziphambili nazo zihlala kwimarike ethile.
Iimpawu ezine zenqanaba lebhetri yeCMC
Ngenxa yokunganyibiliki kakuhle kwamanzi kwisakhiwo se-asidi ye-carboxymethyl cellulose, ukuze isetyenziswe ngcono, i-CMC yinto esetyenziswa kakhulu kwimveliso yebhetri.
Njengombhobho oyintloko wezinto ezingalunganga ze-electrode ezisekelwe emanzini, iimveliso ze-CMC zisetyenziswa ngokubanzi ngabavelisi bebhetri basekhaya nabangaphandle. Elona xabiso lifanelekileyo lesibophelelo linokufumana umthamo omkhulu webhetri, ubomi bomjikelo omde kunye nokunganyangeki okuphantsi kwangaphakathi.
Iimpawu ezine zeCMC zezi:
Okokuqala, i-CMC inokwenza imveliso ibe yi-hydrophilic kunye ne-soluble, i-soluble ngokupheleleyo emanzini, ngaphandle kweentsinga zamahhala kunye nokungcola.
Okwesibini, iqondo lokutshintshwa lifanayo kwaye i-viscosity izinzile, enokubonelela nge-viscosity ezinzileyo kunye nokubambelela.
Okwesithathu, ukuvelisa iimveliso ezihlambulukileyo kunye nomxholo we-ion yensimbi ephantsi.
Okwesine, imveliso inokuhambelana kakuhle ne-SBR latex kunye nezinye izinto.
I-CMC ye-sodium carboxymethyl cellulose esetyenziswe kwibhetri iye yaphucula ngokusemgangathweni umphumo wokusetyenziswa kwayo, kwaye kwangaxeshanye ibonelela ngokusebenza kakuhle, kunye nesiphumo sokusetyenziswa kwangoku.
Indima yeCMC kwiibhetri
I-CMC yi-carboxymethylated derivative ye-cellulose, edla ngokulungiswa ngokuphendula i-cellulose yendalo kunye ne-alkali ye-caustic kunye ne-monochloroacetic acid, kunye nobunzima bayo be-molecular ranges ukusuka kumawaka ukuya kwizigidi.
I-CMC ngumgubo omhlophe ukuya kumthubi okhanyayo, i-granular okanye i-fibrous substance, ene-hygroscopicity eyomeleleyo kwaye inyibilika lula emanzini. Xa ingathathi hlangothi okanye i-alkaline, isisombululo singulwelo oluphezulu lwe-viscosity. Ukuba ishushu ngaphezu kwe-80 ℃ ixesha elide, i-viscosity iya kuncipha kwaye ayiyi kunyibilika emanzini. Ijika ibentsundu xa ishushu kwi 190-205°C, ize ikharbhonize xa ishushu kwi 235-248°C.
Ngenxa yokuba i-CMC inemisebenzi yokuqina, ukudibanisa, ukugcinwa kwamanzi, i-emulsification kunye nokumiswa kwisisombululo samanzi, isetyenziswa ngokubanzi kwimimandla yeeseramics, ukutya, izithambiso, ukuprinta kunye nokudaya, ukwenza iphepha, iingubo, iingubo, izinto zokuncamathelisa kunye namayeza, aphezulu- i-ceramics yokuphelisa kunye neebhetri ze-lithium I-akhawunti yentsimi malunga ne-7%, eyaziwa ngokuba yi "industrial monosodium glutamate".
Ngokuthe ngqoCMCebhetri, imisebenzi ye-CMC yile: ukusasaza i-electrode engalunganga izinto ezisebenzayo kunye ne-agent conductive; ukutyeba kunye nefuthe lokuchasana ne-sedimentation kwi-electrode slurry engalunganga; ukunceda ukudibanisa; ukuzinzisa ukusebenza kokusebenza kwe-electrode kunye nokunceda ukuphucula umjikelo webhetri Ukusebenza; ukuphucula amandla e-peel yesiqwenga se-pole, njl.
Ukusebenza kunye nokukhethwa kweCMC
Ukongeza i-CMC xa usenza i-electrode slurry inokunyusa i-viscosity ye-slurry kwaye ithintele i-slurry ekuzinzeni. I-CMC iya kubola i-ion zesodium kunye ne-anions kwisisombululo esinamanzi, kwaye i-viscosity yeglue ye-CMC iya kuncipha ngokunyuka kwamaqondo obushushu, ekulula ukufunxa ukufuma kwaye i-elasticity embi.
I-CMC inokudlala indima entle kakhulu ekusasazweni kwegraphite ye-electrode engalunganga. Njengoko inani le-CMC linyuka, iimveliso zayo zokubola ziya kubambelela kumphezulu weengqungquthela zegraphite, kunye neengqungquthela zegraphite ziya kugxotha omnye komnye ngenxa yamandla e-electrostatic, ukufikelela kwisiphumo esihle sokusasazeka.
Ukungalungi okucacileyo kwe-CMC kukuba inobunkunkqele. Ukuba yonke i-CMC isetyenziswe njenge-binder, i-electrode ye-graphite negative iya kuwa ngexesha lokucinezela kunye nokusika i-pole piece, eya kubangela ilahleko enkulu yomgubo. Ngelo xesha, i-CMC ichaphazeleka kakhulu ngumlinganiselo wezinto ze-electrode kunye nexabiso le-pH, kwaye ishidi ye-electrode inokuqhekeka ngexesha lokutshaja kunye nokukhupha, okuchaphazela ngokuthe ngqo ukhuseleko lwebhetri.
Ekuqaleni, i-binder esetyenziselwa ukuvuselela i-electrode engalunganga yayiyi-PVDF kunye nezinye izibophelelo ezisekelwe kwioli, kodwa ngokuqwalasela ukukhuselwa kwendalo kunye nezinye izinto, kuye kwaba yinto eqhelekileyo ukusebenzisa izibophelelo ezisekelwe emanzini kwii-electrode ezimbi.
Umdibanisi ogqibeleleyo akakho, zama ukukhetha isibophelelo esihlangabezana nokusetyenzwa komzimba kunye neemfuno ze-electrochemical. Ngokuphuhliswa kobuchwepheshe bebhetri ye-lithium, kunye neendleko kunye nemiba yokukhuselwa kwendalo, izibophelelo ezisekelwe emanzini ekugqibeleni ziza kuthatha indawo ye-oyile-based binders.
I-CMC yinkqubo yokuvelisa ezimbini eziphambili
Ngokutsho kweendaba ezahlukeneyo ze-etherification, imveliso yoshishino ye-CMC inokwahlulwa ibe ngamacandelo amabini: indlela esekwe emanzini kunye nendlela esekwe kwi-solvent. Indlela yokusebenzisa amanzi njengendlela yokusabela ibizwa ngokuba yindlela ephakathi kwamanzi, esetyenziselwa ukuvelisa i-alkaline medium and low-grade CMC. Indlela yokusebenzisa i-solvent ye-organic njengoko i-reaction medium ibizwa ngokuba yi-solvent method, efanelekileyo kwimveliso ye-CMC ephakathi kunye nephezulu. Ezi mpendulo zimbini zenziwa kwi-kneader, eyenkqubo yokuxova kwaye ngoku yeyona ndlela iphambili yokuvelisa i-CMC.
Indlela ephakathi kwamanzi: inkqubo yemveliso yangaphambili yemveliso, indlela yokusabela kwiselulosi yealkali kunye nearhente ye-etherification phantsi kweemeko zealkali yasimahla kunye namanzi, esetyenziselwa ukulungiselela iimveliso zeCMC ezikumgangatho ophakathi kunye nezisezantsi, ezinjengezokucoca kunye nezixhobo zokulinganisa impahla Linda. . Inzuzo yendlela ephakathi kwamanzi kukuba iimfuno zezixhobo zilula kwaye iindleko ziphantsi; Ububi kukuba ngenxa yokunqongophala kwesixa esikhulu solwelo oluphakathi, ubushushu obuveliswa yi-reaction kwandisa ubushushu kwaye bukhawulezisa isantya seempendulo zecala, okukhokelela ekusebenzeni kakuhle kwe-etherification kunye nomgangatho ophantsi wemveliso.
Indlela yokunyibilikisa; ekwabizwa ngokuba yi-organic solvent method, yohlulwe ngendlela yokuxova kunye ne-slurry method ngokobungakanani be-reaction diluent. Olona phawu lwayo kukuba i-alkalization kunye nee-etherification reactions zenziwa phantsi kwemeko ye-solvent ye-organic njenge-reaction medium (diluent) ye. Njengenkqubo yokusabela kwindlela yamanzi, indlela yokunyibilikisa iqulethe izigaba ezibini ze-alkalization kunye ne-etherification, kodwa indlela yokusabela kwezi zigaba zimbini yahlukile. Inzuzo yendlela ye-solvent kukuba ishiya iinkqubo ze-alkali yokucwina, ukucinezela, ukutyumza, kunye nokuguga okuhambelana nendlela yamanzi, kunye ne-alkalization kunye ne-etherification zonke zenziwa kwi-kneader; into engalunganga kukuba ukulawuleka kweqondo lobushushu kuphantsi, kwaye iimfuno zendawo zisezantsi kakhulu. ,ixabiso eliphezulu.
Ixesha lokuposa: Jan-05-2023