Khoom siv Cathode
Nyob rau hauv kev npaj ntawm inorganic electrode cov ntaub ntawv rau lithium ion roj teeb, siab kub khoom lub xeev cov tshuaj tiv thaiv yog feem ntau siv.Cov tshuaj tiv thaiv kub siab-theem: yog hais txog cov txheej txheem uas cov reactants suav nrog cov khoom siv-theem cov tshuaj tiv thaiv rau ib lub sijhawm ntawm qhov kub thiab txias thiab tsim cov tshuaj tiv thaiv los ntawm kev sib nrig sib txawv ntawm ntau lub ntsiab lus los tsim cov tshuaj ruaj khov tshaj plaws ntawm qhov kub thiab txias. , suav nrog cov tshuaj tiv thaiv-khoom, cov tshuaj tiv thaiv-kua thiab cov tshuaj tiv thaiv-kua.
Txawm hais tias sol-gel txoj kev, txoj kev coprecipitation, hydrothermal method thiab solvothermal method yog siv, solid-phase cov tshuaj tiv thaiv los yog solid-theem sintering ntawm qhov kub thiab txias feem ntau yuav tsum tau.Qhov no yog vim lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm lithium-ion roj teeb xav kom nws cov khoom siv hluav taws xob tuaj yeem rov qab ntxig thiab tshem tawm li +, yog li nws cov qauv lattice yuav tsum muaj kev ruaj ntseg txaus, uas yuav tsum muaj cov crystallinity ntawm cov khoom siv yuav tsum siab thiab cov qauv siv lead ua yuav tsum tsis tu ncua. .Qhov no yog qhov nyuaj rau kev ua tiav nyob rau hauv qhov kub thiab txias, yog li cov khoom siv hluav taws xob ntawm lithium-ion roj teeb siv tau tam sim no tau txais los ntawm qhov kub thiab txias-lub xeev cov tshuaj tiv thaiv.
Cov khoom siv cathode ua cov kab ntau lawm suav nrog kev sib xyaw ua ke, sintering system, crushing system, dej ntxhua khaub ncaws (tsuas yog npib tsib xee siab), ntim system, hmoov conveying system thiab ntse tswj system.
Thaum cov txheej txheem ntub dej sib xyaw yog siv los tsim cov khoom siv cathode rau cov roj teeb lithium-ion, ziab cov teeb meem feem ntau ntsib.Cov kuab tshuaj sib txawv siv hauv cov txheej txheem ntub dej sib xyaw yuav ua rau cov txheej txheem ziab thiab cov khoom sib txawv.Tam sim no, feem ntau yog ob hom kuab tshuaj siv hauv cov txheej txheem ntub dej: cov kuab tshuaj tsis muaj dej, uas yog cov kuab tshuaj organic xws li ethanol, acetone, thiab lwm yam;Cov kuab tshuaj dej.Cov khoom siv ziab kom ntub dej ntawm lithium-ion roj teeb cathode cov ntaub ntawv feem ntau suav nrog: lub tshuab nqus tsev rotary tshuab, lub tshuab nqus tsev rake, tshuaj tsuag tshuab, lub tshuab nqus tsev siv tshuab.
Kev tsim cov khoom siv cathode rau cov roj teeb lithium-ion feem ntau yog siv cov txheej txheem kub-state sintering synthesis, thiab nws cov khoom tseem ceeb thiab cov khoom tseem ceeb yog sintering kiln.Cov khoom siv raw rau kev tsim cov lithium-ion roj teeb cathode cov ntaub ntawv yog sib xyaw ua ke thiab qhuav, tom qab ntawd thauj mus rau hauv lub kiln rau sintering, thiab tom qab ntawd tshem tawm ntawm lub kiln mus rau hauv cov txheej txheem crushing thiab kev faib tawm.Rau kev tsim cov khoom siv cathode, cov kev qhia thiab kev lag luam xws li kev tswj qhov kub thiab txias, qhov kub thiab txias uniformity, huab cua tswj thiab uniformity, continuity, ntau lawm, lub zog noj thiab automation degree ntawm lub kiln yog ib qho tseem ceeb heev.Tam sim no, lub ntsiab sintering khoom siv nyob rau hauv zus tau tej cov ntaub ntawv cathode yog pusher kiln, roller kiln thiab tswb hub rauv.
◼ Cov menyuam kiln yog qhov nruab nrab qhov cub qhov cub nrog cov cua kub tsis tu ncua thiab sintering.
◼ Raws li cov cua sov cua sov, zoo li lub qhov cub hluav taws xob, cov tub rau khoom kuj tau muab faib ua cua kiln thiab cua kiln.
- Cua kiln: feem ntau yog siv rau sintering cov ntaub ntawv uas yuav tsum tau oxidizing cua, xws li lithium manganate cov ntaub ntawv, lithium cobalt oxide cov ntaub ntawv, ternary cov ntaub ntawv, thiab lwm yam;
- Atmosphere kiln: feem ntau yog siv rau NCA ternary cov ntaub ntawv, lithium hlau phosphate (LFP) cov ntaub ntawv, graphite anode cov ntaub ntawv thiab lwm yam sintering cov ntaub ntawv uas xav tau cua (xws li N2 los yog O2) roj tiv thaiv.
◼ Cov menyuam kiln txais cov txheej txheem kev sib txhuam, yog li qhov ntev ntawm lub qhov cub yuav tsis cuam tshuam los ntawm lub zog propulsion.Raws li txoj cai, nws tuaj yeem ua tsis kawg.Cov yam ntxwv ntawm cov qauv ntawm cov kab noj hniav, zoo sib xws thaum tua cov khoom, thiab cov qauv ntawm cov kab noj hniav loj loj yog qhov tsim nyog rau kev txav ntawm cov cua ntws hauv qhov cub thiab cov kua dej thiab cov roj hmab tawm ntawm cov khoom.Nws yog cov khoom siv uas nyiam los hloov lub qhov cub hluav taws xob kom paub txog cov khoom loj loj.
◼ Tam sim no, lithium cobalt oxide, ternary, lithium manganate thiab lwm yam cathode cov ntaub ntawv ntawm lithium-ion roj teeb yog sintered nyob rau hauv ib tug cua roller kiln, thaum lithium hlau phosphate yog sintered nyob rau hauv ib tug menyuam kiln tiv thaiv los ntawm nitrogen, thiab NCA yog sintered nyob rau hauv ib tug roller kiln. kiln tiv thaiv los ntawm oxygen.
Cov khoom siv hluav taws xob tsis zoo
Cov kauj ruam tseem ceeb ntawm cov txheej txheem yooj yim ntawm cov khoom siv hluav taws xob muaj xws li pretreatment, pyrolysis, sib tsoo pob, graphitization (uas yog, kev kho cua sov, kom cov pa roj carbon atoms qub raug teeb tsa kom zoo, thiab cov kev sib txuas tseem ceeb), sib tov, txheej, sib tov. kuaj, ntsuas, ntim thiab warehousing.Tag nrho cov kev ua haujlwm yog zoo thiab complex.
◼ Granulation muab faib ua cov txheej txheem pyrolysis thiab pob milling txheej txheem.
Nyob rau hauv cov txheej txheem pyrolysis, muab cov khoom nruab nrab 1 rau hauv lub reactor, hloov cov huab cua nyob rau hauv lub reactor nrog N2, kaw lub reactor, hluav taws xob cua sov nws raws li qhov kub thiab txias nkhaus, do ntawm 200 ~ 300 ℃ rau 1 ~ 3h, thiab ces mus ntxiv. kom sov nws mus rau 400 ~ 500 ℃, do kom tau cov khoom nrog particle loj ntawm 10 ~ 20mm, txo qhov kub thiab tso tawm kom tau cov khoom nruab nrab 2. Muaj ob hom khoom siv hauv cov txheej txheem pyrolysis, ntsug reactor thiab nruam. cov khoom siv granulation, ob qho tib si muaj tib txoj cai.Lawv ob leeg do los yog txav mus rau hauv ib qho kev ntsuas kub kom hloov cov khoom muaj pes tsawg leeg thiab lub cev thiab tshuaj lom neeg hauv lub reactor.Qhov sib txawv yog tias lub tshuab hluav taws xob ntsug yog qhov sib xyaw ua ke ntawm cov hluav taws kub kub thiab dej txias.Cov khoom siv nyob rau hauv lub kettle yog hloov los ntawm stirring raws li qhov kub thiab txias nkhaus nyob rau hauv lub kub kettle.Tom qab ua tiav, nws tau muab tso rau hauv lub thawv txias kom txias, thiab lub thawv kub tuaj yeem muab pub.Cov khoom siv granulation tsis tu ncua paub txog kev ua haujlwm tas mus li, nrog kev siv hluav taws xob tsawg thiab cov zis siab.
◼ Carbonization thiab graphitization yog ib feem tseem ceeb.Lub cub tawg carbonization carbonizes cov ntaub ntawv ntawm nruab nrab thiab qis kub.Qhov kub ntawm qhov cub carbonization tuaj yeem ncav cuag 1600 degrees Celsius, uas tuaj yeem ua tau raws li qhov xav tau ntawm carbonization.Lub siab-precision ntse ntsuas kub thiab tsis siv neeg PLC saib xyuas yuav ua rau cov ntaub ntawv tsim tawm hauv cov txheej txheem carbonization raug tswj tau.
Graphitization rauv, suav nrog kab rov tav siab kub, qis qis, ntsug, thiab lwm yam, qhov chaw graphite hauv graphite kub cheeb tsam (carbon muaj ib puag ncig) rau sintering thiab smelting, thiab qhov kub ntawm lub sijhawm no tuaj yeem ncav cuag 3200 ℃.
◼ Txheej
Cov khoom siv nruab nrab 4 yog thauj mus rau hauv silo los ntawm kev siv lub tshuab tsis siv neeg, thiab cov khoom siv tau ntim rau hauv lub thawv promethium los ntawm tus neeg siv khoom.Tsis siv neeg conveying system thauj lub thawv promethium mus rau lub reactor tas mus li (cov menyuam kiln) rau txheej, Tau txais cov khoom nruab nrab 5 (nyob rau hauv kev tiv thaiv ntawm nitrogen, cov khoom yog rhuab mus rau 1150 ℃ raws li ib tug tej yam kub nce nkhaus rau 8 ~ 10h. Cov txheej txheem cua sov yog ua kom sov cov khoom siv hluav taws xob, thiab cov txheej txheem cua sov yog qhov tsis ncaj, cov cua sov hloov cov asphalt zoo ntawm cov khoom siv graphite rau hauv cov txheej txheem pyrolytic carbon txheej thaum lub sij hawm cua sov, cov resins nyob rau hauv high-zoo asphalt condense, thiab cov siv lead ua morphology hloov pauv (amorphous lub xeev hloov mus rau hauv lub xeev crystalline), ib qho kev txiav txim microcrystalline carbon txheej yog tsim nyob rau saum npoo ntawm ntuj kheej kheej graphite hais, thiab thaum kawg ib coated graphite zoo li cov khoom siv nrog "core-plhaub" qauv yog tau