1. Kev cuam tshuam ntawm txheej txheej txheem ntawm kev ua haujlwm ntawm lithium roj teeb
Polar txheej feem ntau yog hais txog cov txheej txheem ntawm cov txheej txheem sib npaug ntawm cov nplaum slurry mus rau cov khoom tam sim no thiab ziab cov organic solvents hauv slurry. Cov nyhuv txheej muaj qhov cuam tshuam loj rau lub roj teeb muaj peev xwm, kev ua haujlwm sab hauv, lub neej voj voog, thiab kev nyab xeeb, ua kom cov txheej txheem ntawm cov ntawv electrode. Kev xaiv cov txheej txheem txheej thiab kev tswj tsis tau muaj feem cuam tshuam rau kev ua haujlwm ntawm lithium-ion roj teeb, feem ntau tshwm sim hauv:
1) Txheej ziab kom qhuav kub tswj: Yog tias qhov ziab kom qhuav thaum lub sij hawm txheej txheej tsawg dhau, nws tsis tuaj yeem lav qhov ziab kom tiav ntawm cov electrode. Yog tias qhov kub thiab txias dhau lawm, nws yuav ua rau tawg, tev, thiab lwm yam tshwm sim ntawm cov txheej txheej ntawm cov electrode vim yog evaporation sai ntawm cov kuab tshuaj organic hauv cov electrode;
2) Txheej saum npoo ntom ntom: Yog tias txheej txheej deg ntom ntom ntom dhau tsawg, lub roj teeb muaj peev xwm tsis ncav cuag cov nominal muaj peev xwm. Yog hais tias txheej txheej deg ntom yog dhau lawm, nws yog ib qho yooj yim los ua rau nkim ntawm cov khoom xyaw. Nyob rau hauv cov xwm txheej hnyav, yog tias muaj ntau tshaj ntawm qhov zoo electrode muaj peev xwm, lithium dendrites yuav tsim vim lithium nag lossis daus thiab tho lub roj teeb cais, ua rau luv luv thiab ua rau muaj kev nyab xeeb;
3) Txheej loj: Yog tias cov txheej txheej me me dhau los yog loj dhau, nws yuav ua rau cov hluav taws xob zoo hauv lub roj teeb tsis raug them tag nrho los ntawm qhov tsis zoo electrode. Thaum lub sij hawm them tus txheej txheem, lithium ions tau kos los ntawm qhov zoo electrode thiab txav mus rau cov electrolyte uas tsis tau them tag nrho los ntawm qhov tsis zoo electrode. Lub peev xwm tiag tiag ntawm cov khoom siv hluav taws xob tsis tuaj yeem siv tau zoo, thiab hauv qhov xwm txheej hnyav, lithium dendrites tuaj yeem tsim hauv lub roj teeb, uas tuaj yeem cuam tshuam cov khoom sib cais yooj yim thiab ua rau muaj kev puas tsuaj rau sab hauv ntawm lub roj teeb;
4) Txheej thickness: Yog hais tias txheej thickness yog nyias los yog tuab heev, nws yuav cuam tshuam rau cov txheej txheem tom ntej electrode dov thiab tsis tuaj yeem lav qhov sib xws ntawm cov roj teeb electrode.
Tsis tas li ntawd, electrode txheej yog qhov tseem ceeb heev rau kev nyab xeeb ntawm cov roj teeb. Ua ntej txheej txheej, 5S yuav tsum ua haujlwm kom ntseeg tau tias tsis muaj cov khoom, cov khib nyiab, plua plav, thiab lwm yam sib xyaw rau hauv cov electrode thaum txheej txheej txheej. Yog tias cov khib nyiab sib xyaw ua ke, nws tuaj yeem ua rau micro short circuits hauv lub roj teeb, thiab hauv qhov xwm txheej hnyav, nws tuaj yeem ua rau hluav taws kub thiab tawg.
2. Kev xaiv cov khoom siv txheej txheej thiab txheej txheej txheej
Cov txheej txheem txheej txheem dav dav suav nrog: unwinding → splicing → rub → nro tswj → txheej → ziab → kho → nro tswj → kho → winding thiab lwm yam txheej txheem. Cov txheej txheem txheej txheej yog nyuaj, thiab tseem muaj ntau yam cuam tshuam rau txheej txheej, xws li kev tsim cov khoom siv txheej txheej, kev ua haujlwm zoo ntawm cov khoom siv, kev tswj cov dynamic nro thaum txheej txheej txheej, qhov loj ntawm huab cua. ntws thaum lub sij hawm ziab, thiab ntsuas kub tswj nkhaus. Yog li ntawd, xaiv cov txheej txheem txheej tsim nyog yog qhov tseem ceeb heev.
Feem ntau, thaum xaiv txheej txheem txheej txheej, ntau yam yuav tsum tau txiav txim siab, suav nrog cov khaubncaws sab nraud povtseg, nrog cov txheej ntub ntawm cov kua dej, cov txheej txheej uas yuav tsum tau ua, cov txheej txheej txheej los yog txheej txheej lossis substrate, thiab txheej ceev.
Ntxiv nrog rau cov xwm txheej saum toj no, nws tseem yuav tsum tau xav txog cov xwm txheej tshwj xeeb thiab cov yam ntxwv ntawm cov txheej txheem electrode. Cov yam ntxwv ntawm lithium-ion roj teeb electrode txheej yog: ① ob-sided ib txheej txheej; ② Cov txheej ntub dej ntawm cov slurry yog tuab (100-300 μ m); ③ Cov slurry yog cov kua uas tsis yog Newtonian siab viscosity; ④ Qhov yuav tsum tau ua kom muaj nuj nqis rau polar zaj duab xis txheej yog siab, zoo ib yam li cov zaj duab xis txheej; ⑤ Cov txheej txheej txhawb nqa muaj aluminium ntawv ci thiab tooj liab ntawv ci nrog lub thickness ntawm 10-20 μ m; ⑥ Piv rau txheej ceev ntawm zaj duab xis, txheej ceev ntawm polarizer tsis siab. Ua raws li cov ntsiab lus saum toj no, feem ntau cov khoom siv hauv chav kuaj tau txais cov khoom siv scraper, cov neeg siv khoom siv roj teeb lithium-ion feem ntau siv cov yob txheej hloov hom, thiab cov roj teeb hluav taws xob feem ntau yog siv txoj kev slit extrusion.
Scraper txheej: Cov ntawv ci substrate dhau los ntawm cov menyuam txheej txheej thiab ncaj qha hu rau lub tank slurry. Tshaj slurry yog siv rau cov ntawv ci substrate. Thaum lub substrate hla nruab nrab ntawm cov menyuam txheej thiab cov scraper, qhov sib txawv ntawm cov scraper thiab substrate txiav txim siab cov txheej thickness. Nyob rau tib lub sij hawm, tshaj slurry yog scraped tawm thiab refluxed, tsim ib tug uniform txheej ntawm lub substrate. Lub ntsiab hom ntawm scrapers yog comma scrapers. Lub comma scraper yog ib qho ntawm cov khoom tseem ceeb hauv lub taub hau txheej. Nws yog feem ntau machined raws lub generatrix rau ntawm qhov chaw ntawm lub voj voog cov menyuam los ua ib tug comma zoo li ntug. Cov scraper no muaj lub zog siab thiab hardness, thiab yooj yim los tswj cov txheej txheej thiab raug. Nws yog tsim rau cov ntsiab lus siab thiab siab viscosity slurries.
Cov menyuam txheej hloov pauv hom: Cov txheej txheej cov menyuam tig los tsav cov slurry, thiab cov nyiaj hloov pauv ntawm cov slurry raug kho los ntawm qhov sib txawv ntawm cov comma scraper. Lub slurry yog pauv mus rau lub substrate los ntawm kev sib hloov ntawm lub nraub qaum cov menyuam thiab cov txheej txheej. Cov txheej txheem yog qhia nyob rau hauv daim duab 2. Cov menyuam txheej hloov txheej txheej yuav tsum muaj ob txoj hauv kev: (1) kev sib hloov ntawm cov txheej txheej cov menyuam tsav cov slurry kom dhau los ntawm qhov sib txawv ntawm cov ntsuas chais, tsim ib qho thickness ntawm slurry txheej; (2) Ib co thickness ntawm slurry txheej yog pauv mus rau cov ntawv ci los ntawm rotating txheej txheej rau cov menyuam thiab rov qab cov menyuam nyob rau hauv opposite lus qhia los ua ib tug txheej.
Slit extrusion txheej: Raws li cov txheej txheem ntub dej ntub dej, raws li qhia hauv daim duab 3, lub hauv paus ntsiab lus ua haujlwm yog tias cov kua txheej txheej yog extruded thiab txau raws qhov khoob ntawm cov txheej pwm nyob rau hauv ib qho kev siab thiab ntws tus nqi, thiab xa mus rau lub substrate. Piv nrog rau lwm txoj kev txheej txheej, nws muaj ntau yam zoo, xws li txheej txheej ceev ceev, qhov tseeb siab, thiab cov tuab ntub dej tsis sib xws; Cov txheej txheem txheej txheej raug kaw, uas tuaj yeem tiv thaiv cov pa phem los ntawm kev nkag mus thaum txheej txheej txheej txheej txheej. Kev siv tus nqi ntawm cov slurry yog siab, thiab cov khoom ntawm cov slurry tuaj yeem tswj tau ruaj khov. Ntau txheej txheej txheej tuaj yeem ua tiav ib txhij. Thiab nws tuaj yeem hloov mus rau qhov sib txawv viscosity thiab cov ntsiab lus sib txawv ntawm slurry, thiab muaj zog adaptability piv rau cov txheej txheem hloov txheej.
3. Txheej tsis xws luag thiab muaj feem cuam tshuam
Txo cov txheej txheem txheej txheem, txhim kho txheej txheej zoo thiab tawm los, thiab txo cov nqi thaum txheej txheej txheej txheej yog qhov tseem ceeb uas yuav tsum tau kawm hauv cov txheej txheem txheej txheem. Cov teeb meem tshwm sim hauv txheej txheej txheej muaj xws li tuab lub taub hau thiab nyias tus Tsov tus tw, tuab npoo ntawm ob sab, taw tes zoo li qhov tsaus nti, ntxhib nto, thiab cov ntawv ci. Lub thickness ntawm lub taub hau thiab tus Tsov tus tw tuaj yeem hloov kho los ntawm qhov qhib thiab kaw lub sijhawm ntawm cov txheej txheem valve lossis qhov sib cuam tshuam valve. Qhov teeb meem ntawm cov npoo tuab tuaj yeem txhim kho los ntawm cov yam ntxwv ntawm cov khoom slurry, txheej sib txawv ntawm qhov hloov kho, slurry txaus tus nqi, thiab lwm yam. Qhov saum npoo roughness, unevenness, thiab kab txaij tuaj yeem txhim kho los ntawm stabilizing cov ntawv ci, txo qhov nrawm, thiab kho lub kaum sab xis. ntawm rab riam cua.
Substrate - Slurry
Kev sib raug zoo ntawm cov khoom siv lub cev ntawm cov slurry thiab txheej: Hauv cov txheej txheem tiag tiag, cov viscosity ntawm slurry muaj qee yam cuam tshuam rau cov nyhuv txheej. Lub viscosity ntawm slurry npaj sib txawv nyob ntawm seb cov khoom siv electrode, slurry ratio, thiab hom binder xaiv. Thaum lub viscosity ntawm slurry siab dhau lawm, txheej txheej feem ntau tsis tuaj yeem nqa tawm tsis tu ncua thiab ruaj khov, thiab cov nyhuv txheej kuj cuam tshuam.
Lub uniformity, stability, ntug thiab nto los ntawm cov kua txheej yog ncaj qha txiav txim los ntawm lub rheological zog ntawm lub txheej kua, yog li ncaj qha txiav txim qhov zoo ntawm txheej. Kev soj ntsuam theoretical, txheej kev sim txheej txheem, kua dej dynamics finite cov tswv yim, thiab lwm yam kev tshawb fawb yuav siv tau los kawm lub qhov rais txheej, uas yog hais txog cov txheej txheem ua haujlwm ntau yam uas tuaj yeem ua tiav cov txheej txheem ruaj khov thiab tau txais txheej txheej.
Substrate - tooj liab thiab txhuas ntawv ci
Nto nro: Qhov nro ntawm tooj liab aluminium ntawv ci yuav tsum siab dua li ntawm cov tshuaj coated, txwv tsis pub cov tshuaj yuav nyuaj rau kis tau yooj yim ntawm cov substrate, ua rau cov txheej txheem tsis zoo. Ib txoj hauv kev los ua raws li yog tias qhov nro ntawm qhov kev daws teeb meem yuav tsum yog 5 dynes / cm qis dua li ntawm cov substrate, txawm hais tias qhov no tsuas yog ntxhib xwb. Qhov nro ntawm cov tshuaj thiab substrate tuaj yeem hloov kho los ntawm kev kho cov mis los yog kev kho deg ntawm cov substrate. Kev ntsuas ntawm qhov nro ntawm qhov chaw rau ob qho tib si yuav tsum tau suav nrog raws li kev tswj xyuas qhov zoo.
Uniform thickness: Hauv cov txheej txheem zoo ib yam li cov txheej txheej scraper, cov thickness tsis sib npaug ntawm cov substrate tuaj yeem ua rau cov txheej tsis sib xws. Vim hais tias nyob rau hauv txheej txheem txheej, txheej thickness yog tswj los ntawm qhov sib txawv ntawm cov scraper thiab substrate. Yog hais tias muaj tsawg dua thickness ntawm substrate nyob rau hauv transverse kev taw qhia, ntau cov tshuaj yuav dhau los ntawm cheeb tsam ntawd thiab cov txheej thickness yuav thicker, thiab vice versa. Yog hais tias lub thickness fluctuation ntawm lub substrate yog soj ntsuam los ntawm lub thickness gauge, qhov kawg zaj duab xis thickness fluctuation kuj yuav qhia tib qhov sib txawv. Tsis tas li ntawd, lateral thickness sib txawv kuj tuaj yeem ua rau muaj qhov tsis xws luag hauv winding. Yog li txhawm rau kom tsis txhob muaj qhov tsis xws luag, nws yog ib qho tseem ceeb uas yuav tsum tswj cov thickness ntawm cov khoom siv raw
Cov hluav taws xob zoo li qub: Ntawm cov kab txheej txheej, ntau cov hluav taws xob zoo li qub yog tsim rau ntawm qhov chaw ntawm lub substrate thaum lub sij hawm unwinding thiab dhau los ntawm cov menyuam. Cov hluav taws xob zoo li qub tau tsim tau yooj yim adsorb huab cua thiab cov hmoov tshauv ntawm cov menyuam, ua rau cov txheej txheem tsis xws luag. Thaum lub sij hawm tso tawm, hluav taws xob zoo li qub tuaj yeem ua rau electrostatic tsos tsis xws luag ntawm txheej txheej, thiab qhov hnyav dua, nws tuaj yeem ua rau hluav taws kub. Yog tias cov av noo tsawg nyob rau lub caij ntuj no, qhov teeb meem hluav taws xob zoo li qub ntawm cov kab txheej txheej yuav yog qhov tseem ceeb thiab hnyav dua. Txoj hauv kev zoo tshaj plaws los txo qhov tsis xws luag yog ua kom cov av noo ib puag ncig kom siab li sai tau, hauv av txheej txheej, thiab nruab qee cov khoom siv tiv thaiv zoo li qub.
Kev huv huv: Cov impurities ntawm qhov chaw ntawm lub substrate tuaj yeem ua rau lub cev tsis xws luag xws li pob, av, thiab lwm yam. Yog li hauv cov txheej txheem ntawm cov khoom siv substrate, nws yog ib qho tsim nyog los tswj kev huv ntawm cov ntaub ntawv raw khoom kom zoo. Online zaj duab xis tu rollers yog ib txoj hauv kev zoo rau tshem tawm cov substrate impurities. Txawm hais tias tsis yog tag nrho cov impurities ntawm daim nyias nyias tuaj yeem raug tshem tawm, nws tuaj yeem txhim kho cov khoom zoo thiab txo qhov poob.
4. Daim ntawv qhia tsis raug ntawm lithium roj teeb electrodes
【1】 npuas tsis xws luag nyob rau hauv qhov tsis zoo electrode txheej ntawm lithium-ion roj teeb
【2】 Pinhole
【3】 Khawb
【4】 Thicked ntug
【5】 Aggregated hais rau ntawm qhov tsis zoo electrode nto
【6】 Aggregated hais nyob rau saum npoo ntawm qhov zoo electrode
【7】 Dej system polar tawg
【8】 Nto shrinkage ntawm polarizer
【9】 Kos rau saum npoo ntawm polarizer
【10】 Siv cov kab txaij ntsug
【11】 Rolling kab nrib pleb nyob rau hauv ib nrab qhuav cheeb tsam ntawm polarizer
【12】 Wrinkles ntawm ntug ntawm lub polarizer roller
【13】 Tsis zoo electrode slitting txheej thiab ntawv ci detachment
【14】 Polar hlais txiav burrs
【15】 Polar hlais txiav yoj ntug
5. Uniformity ntawm txheej
Lub npe hu ua txheej uniformity yog hais txog qhov sib xws ntawm txheej thickness los yog nplaum tis nyob rau hauv lub txheej txheej. Qhov zoo dua qhov sib xws ntawm txheej tuab lossis cov nplaum nplaum, qhov zoo dua qhov sib xws ntawm txheej, thiab rov ua dua. Tsis muaj kev ntsuas kev sib koom ua ke rau cov txheej txheem txheej txheej, uas tuaj yeem ntsuas los ntawm qhov sib txawv lossis feem pua ntawm qhov sib txawv ntawm cov txheej tuab lossis cov nplaum nplaum ntawm txhua qhov chaw hauv ib cheeb tsam uas cuam tshuam rau qhov nruab nrab txheej thickness los yog nplaum nyob rau hauv qhov chaw, lossis los ntawm qhov Qhov sib txawv ntawm qhov siab tshaj plaws thiab qhov tsawg kawg nkaus txheej thickness los yog nplaum nplaum nyob rau hauv ib qho chaw. Lub thickness ntawm txheej yog feem ntau qhia nyob rau hauv µ m.
Txheej uniformity yog siv los ntsuam xyuas tag nrho cov txheej txheem txheej ntawm ib cheeb tsam. Tab sis nyob rau hauv qhov tseeb ntau lawm, peb feem ntau mob siab rau ntau yam uniformity nyob rau hauv ob qho tib si kab rov tav thiab ntsug cov lus qhia ntawm lub substrate. Lub thiaj li hu ua lateral uniformity yog hais txog lub uniformity nyob rau hauv lub txheej dav kev taw qhia (los yog tshuab lateral direction). Qhov hu ua longitudinal uniformity yog hais txog qhov sib xws ntawm txheej txheej ntev kev taw qhia (los yog substrate taug kev taw qhia).
Muaj qhov sib txawv tseem ceeb ntawm qhov loj, qhov cuam tshuam, thiab kev tswj cov txheej txheem ntawm kab rov tav thiab ntsug cov kua nplaum ua yuam kev. Feem ntau, qhov loj dua qhov dav ntawm lub substrate (los yog txheej), qhov nyuaj dua nws yog los tswj lub lateral uniformity. Raws li xyoo ntawm kev ua tau zoo hauv txheej txheej, thaum lub substrate dav yog qis dua 800mm, lateral uniformity feem ntau yooj yim guaranteed; Thaum qhov dav ntawm lub substrate nyob nruab nrab ntawm 1300-1800mm, lub lateral uniformity feem ntau yuav tswj tau zoo, tab sis nws yog ib qho nyuaj thiab yuav tsum tau ib tug txiav txim siab ntawm kev txawj ntse; Thaum qhov dav ntawm lub substrate yog siab tshaj 2000mm, nws yog ib qho nyuaj heev los tswj lub lateral uniformity, thiab tsuas yog ob peb manufacturers tuaj yeem ua tau zoo. Raws li qhov ntau lawm batch (xws li txheej ntev) nce, longitudinal uniformity yuav dhau los ua ib qho kev sib tw ntau dua los yog nyuaj dua li transverse uniformity.