Yintoni Ukukhetha Iindlela Zokugquma?

Yintoni Ukukhetha Iindlela Zokugquma?

Zininzi iindlela zokwaleka. Iindlela zokwaleka zediphu ziquka idiphu yokwaleka, ukwambathisa ngencakuba, kunye nocingo -ukwaleka ngentonga yenxeba, njl njl. Iindlela zokwaleka ezisetyenzisiweyo ziquka isilayidi sokutyabeka, i-slot{3}}i-diecoating, i-extrusion coating, kunye ne-curtain coating, njl. Sele sixoxe ngeendlela ezininzi zokwaleka ngokweenkcukacha ngasentla. Ngezantsi sazisa ngokufutshane ezinye iindlela zokwaleka.

Idiphu yokwaleka yindlela yokugquma apho iwebhu intywiliselwa ngokuqhubekayo kwaye itsalwe ngaphandle kwetanki eludaka, kwaye udaka olugqithisileyo lubuyela emva kwitanki, njengoko kubonisiwe kuMfanekiso 5{1}}89. Idiphu yokwaleka idla ngokuphindwe kabini-ikwaleka emacaleni, ngoko ke umkhombandlela wokutsalwa wewebhu uqhelekile ngokwesiqhelo kumphezulu wolwelo ukuqinisekisa ukuba ubungqingqwa kumacala omabini ewebhu buyahambelana. Ngokuqhelekileyo, ubukhulu bokutya buxhomekeke kwi-viscosity, ubuninzi, isantya somgca, kunye ne-angle yokukhupha. Ubukhulu be-slurry bokwambathisa kumphezulu wewebhu buba ngqindilili njengoko i-viscosity eludaka kunye nesantya sokwaleka sikhula. Ewe kunjalo, idiphu yokwambathisa ikwalungele ukusebenza kwangethuba kwezixhobo zokusebenza ezintsonkothileyo, kodwa xa isantya se-solvent volatilization sikhawuleza, kuya kubakho ukuhamba.

Fig 5-89 Dip Coating Method

I-Blade yokwambathisa yindlela yokwaleka esebenzisa iblade yokunciphisa ukutyeba kokutyabeka okuludaka kumqulu wokwaleka okanye kwiwebhu kubukhulu obuchaziweyo, njengoko kubonisiwe kuMfanekiso 5{1}}90. Phakathi kwazo, ukutyeba kokugquma kunye nobunzima bokugquma komoya-ukwaleka kwemela kuxhomekeke emoyeni-kuxinzelelo lwemela kunye nesantya sejethi yomoya, kwaye ifaneleke ngakumbi ukogquma{4}}i-viscosity ephantsi okanye ephakathi{5}}ephantsi{6}}amanzi abonakalayo{8}asekwe kwi-slurries. Xa usebenzisa i-organic solvent-based slurries, kufuneka kuthathelwe ingqalelo ukuphepha ukubunjwa kwemixube eqhumayo ukusuka kumthamo omkhulu womoya kunye nomphunga ovuthayo ovuthayo.

Fig 5-90 Blade Coating

I-Curtain Coating yindlela yokwaleka apho i-slurry ikhutshwe kwi-slot kwaye iwela ngokuthe ngqo kwi-web eqhubayo ngendlela yekhethini yolwelo. Yeyendlela yokwaleka yobungakanani obusetwe ngaphambili, njengoko kubonisiwe kuMfanekiso 5-}91. Ngenxa yokuba umgama phakathi kwe-extrusion die lip kunye ne-web inkulu kwaye akukho bhubhu lomoya kwikhethini, ineenzuzo ezibalaseleyo ekupheliseni iziphene ezinje ngentambo kunye nemikrwelo. Ngenxa yamandla amakhulu e-kinetic yekhethini, inceda ukuzinzisa i-meniscus, ngoko ke isantya esiphezulu sokwambatha sinokufezekiswa. Isantya somgca sinokufikelela ngaphezu kwe-100 m / min kwaye sisanda kwamkelwa kwizisombululo zokugqoka ibhetri ezichanekileyo.

Figure 5-91 Falling curtain coating; Figure 5-92 Wire rod coating

Ucingo{0}}lokugquma intonga yenxeba yindlela yokwaleka esebenzisa ucingo -intonga yokulinganisa inxeba ukugquma ulwelo ngokufanayo kwiwebhu ethambileyo, njengoko kubonisiwe kuMfanekiso 5{3}}92. Ucingo{5}}intonga yenxeba yenziwe ngocingo oluluqilima olupolishiweyo lwentsimbi engatyiwayo olujikeleze intonga engundoqo. Ucingo{8}}intonga yenxeba ikwabizwa ngokuba yintonga yokugquma okanye intonga kagqirha. Xa ucingo olujikelezayo lubhityile kakhulu, ukuchaneka kobunzima bokwambathisa kunokufikelela kwiimicrons ezimbalwa. Ngenxa yokuba -ulwelo lwe-viscosity olusezantsi luhamba lula kwinxeba lentsimbi yentsimbi, ilungele ukugquma ulwelo olune-viscosity ephantsi. Ukusebenzisa iintonga ezikhethekileyo zokugquma, i-viscosity yokugqoka ingaba phezulu, kwaye ubukhulu bengubo bunokufikelela kwi-225 μm. Isantya sokwaleka intonga ngokuqhelekileyo silinganiselwe kwi-304 m / min.

Ukukhethwa kwendlela yokwaleka yiprojekthi ecwangcisiweyo enezinto ezininzi ekufuneka ziqwalaselwe. Oku kulandelayo yimiba ephambili ekufuneka iqwalaselwe xa ukhetha indlela yokwaleka:

Uninzi lweendlela zokugquma zifanelekile ukugquma umaleko omnye ngexesha, kwaye omnye umaleko ugqunywe emva kokuba umaleko odlulileyo womile. Ezinye iindlela zinokwambathisa iileya ezininzi ngaxeshanye, ezinje ngeengubo zesilayidi, ezinokwambatha ubuncinci iileya ezisi-9 ngaxeshanye kwifilimu yombala. Intloko yokugquma ikhethini yintloko yesilayidi, kwaye umaleko wokugquma nawo uqukuqela ezantsi emphethweni, ngoko ke kunokwenziwa ukwaleka kwe-multilayer. I-Slot-i-Diaecoating kunye ne-extrusion coating ikholisa ukwenza enye-ingubo yomaleko, kodwa inokuba neendawo zokubeka ezibini okanye ezithathu ze-extrusion zokugquma kwe-multilayer ezifunwa kakhulu ngabavelisi bebhetri ye-lithium{6}}.

Ngocingo -ukwaleka ngentonga ifanelekile-kumaleko obhityileyo; i-extrusion coating, i-reverse roll coating, kunye ne-curtain coating ifanelekile kwi-coating eshinyeneyo, enokufikelela kwi-400-750 μm. Ngokuqhelekileyo, okukhona i-coatling iyancipha, buninzi ubunzima bokugquma. Kufuneka kuqatshelwe ukuba ubukhulu obukhankanyiweyo apha bubunzima bokugquma okumanzi, kwaye umehluko phakathi kwengubo eyomileyo kunye neengubo ezimanzi mkhulu kakhulu.

I-Viscosity kunye ne-viscoelasticity yizixa zomzimba ezibonisa iimpawu ze-rheological. Indlela yokwaleka nganye inoluhlu oluthile lwe-viscosity efanelekileyo kunye nesantya sokucheba. I-viscosity ye-slurry ikhethwe ngokufanelekileyo ngokuhambelana ne-viscosity elinganiswe kwizinga lokuqhawula i-coating, kuba i-viscosity iyatshintsha kunye nesantya sokucheba. Ukwenziwa kwebhetri ye-lithium eludaka olubonelelwa ngabanikezeli bezinto zebhetri ye-lithium - ion, ulawulo lwe-viscosity oluchanekileyo lube yinto ephambili ekuzinzeni kwenkqubo. Nangona kunjalo, kwinkqubo yokwaleka komyinge osetwe kwangaphambili, umlinganiselo wokucheba apho uludaka luhlala luphantsi khona luphezulu kakhulu, ukuze kube nzima ukuphumeza umlinganiselo ophakamileyo wokucheba ngezixhobo zangoku, ngoko ke uqikelelo lwe-viscosity lurhabaxa, kwaye ekugqibeleni iziphumo zovavanyo ziya kuphumelela. Nangona i-viscoelasticity ibaluleke kakhulu, kunzima ukuqikelela. Enye i-viscoelasticity inceda ukuphucula ukusebenza kweengubo ezithile, kodwa i-viscoelasticity ephezulu inokubangela ukulibaziseka ukutsala iziphene.

I-slot echanekileyo -i-diecoating, i-slide coating, kunye ne-curtain i-coating ine-coating ephezulu yokuchaneka, ngelixa ukuchaneka kwezinye iindlela zokugquma kuxhomekeke kwiipropati zolwelo, i-roller geometry, isantya sokujikeleza, kunye nezinye izinto. Yonke indlela yokugquma inoluhlu olubanzi lokugubungela, oluxhomekeke kwisakhiwo kunye nemodi yokusebenza yesixhobo sokugubungela. Kuphela ngokulungisa kakuhle kakhulu isixhobo sokugquma i-electrode yebhetri ezinokufumaneka iziphumo ezilungileyo zokugquma.

Iwebhu ayinakuba{0}}ingeneke okanye ingene. Kwiwebhu evuzayo, iipores zinokutywinwa ngaphambi kokugquma. Kukwafuneka ukuba kuqwalaselwe uburhabaxa kunye noxinzelelo lomphezulu kwiwebhu. Uxinzelelo lomphezulu lwe-slurry kufuneka lube ngaphantsi kunolo lwewebhu.

Isantya sokugquma sinxulumene nokusebenza kakuhle kwemveliso. Xa kunokwenzeka, ngokukhawuleza isantya sokugquma, singcono. Zonke iindlela zokugquma zinesantya sokwaleka, kodwa ezinye iindlela zingcono-kwisantya esiphezulu. Ukwaleka kwekhethini kufuna umyinge wokuqukuqela okuncinci ukuqinisekisa ukuba umkhusane awukrazuki, ngoko ke-isantya esiphezulu sokwambathisa asinakwenziwa xa umaleko ubhityile. Kwi-slide yesilayidi, xa i-coating layer incinci kakhulu, i-coating layer iya kuba ingazinzile. Isantya esiphezulu kunye nomgangatho wokwambathisa otyebileyo unceda ukuphepha ukungazinzi kokwaleka. Ngokufanayo, iwebhu egudileyo kunye{8}}engangenekiyo inokugqunywa ngesantya esiphezulu. Isantya sokugquma sikwanxulumene nobude becandelo lokumisa. Okukhona icandelo lokumisa lide, kokukhona kuthandeka ngakumbi ukonyusa izinga lokumisa.

Iindlela zokugquma kunye nemigangatho yazo esebenzayo iboniswe kwiThebhile 5-6.

Udidi	Indlela yokwaleka	Ireyithi yokucheba /s⁻¹	Viscosity /Pa·s	Ubunzima obumanzi /μm	Ukuchaneka kokutyabeka /%	Esona santya siphezulu /(m/min)	Impembelelo yoburhabaxa bewebhu
Umgangatho	Umgangatho	0.01-0.10	-	-	-	-	-
	Imela yomoya	-	0.005-0.5	2-40	5	500	Phezulu
	Ngocingo{0}ukwaleka ngentonga	-	0.02-1	5-50	10	250	Phezulu
Umaleko omnye	Ukwaleka ngeblade	1000-10000	0.5-40	1-30	-	1500	Phezulu
		20-40000
	Reverse roll ukutyabeka	100-10000	0.1-50	5-400	5	300	Kancinci
		1000-100000
	Slot-ingubo yokufa	3000-100000	0.005-20	15-250	2	400	Kancinci
	Extrusion ukutyabeka	-	50-5000	15-750	5	700	-
Izixhobo ezininzi	Isilayidi sokwaleka	1000-10000	0.005-0.5	15-250	2	300	Kancinci
		3000-12000
	Ukwaleka kwamakhethini	1000-10000	0.005-0.5	2-500	2	300	Kancinci

Iindlela zokwaleka ze-lithium -i-ion ibhetri ye-electrode sheets ikakhulu i-roll coating kunye ne-extrusion coating. Ukwaleka umva umva kufuna umyinge wokucheba ophezulu, ulungele udaka olune-viscosity ephezulu kancinane, ufumana ifilim ejiyileyo yokugquma kunye nomgangatho olungileyo wokugquma, kwaye ngoku yeyona ndlela ixhaphakileyo yokwaleka kwiibhetri ze-lithium{2}}. I-Extrusion coating imele itekhnoloji yokwaleka ekwinqanaba eliphezulu kushishino. Uxinzelelo oluthile lusetyenziswa kwi-slurry ngexesha lokugquma, olungasetyenziselwa ukugquma kwe-viscosity slurry ephezulu. Iphepha le-electrode elifunyenweyo linokuchaneka okuphezulu kunye nesantya sokutyabeka ngokukhawuleza. Ngophuhliso oluqhubekayo lwethekhnoloji yebhetri ye-lithium kunye nokwanda kwemfuno evela kubenzi bebhetri ye-lithium -abavelisi bebhetri ye-ion yoxinaniso lwamandla aphezulu kunye nokungaguquguquki, i-extrusion coating, exhaswa ngumbuso{8}}we{9}}{10}}izixhobo zokugquma ibhetri ye-electrode ephezulu kunye{11}}nezisombululo ezichanekileyo zokwaleka kwebhetri, ziya kusetyenziswa ngokubanzi kwimigca e-1 elandelayo}