Disassembly thiab rov qab cov lithium hlau phosphate roj teeb

Cov so haujlwm lithium hlau phosphate roj teeb uas tsis muaj nqi ntawm kev siv cascade thiab cov roj teeb tom qab siv cascade yuav thaum kawg nkag mus rau theem ntawm disassembly thiab rov qab. Qhov sib txawv ntawm lithium hlau phosphate roj teeb thiab cov khoom siv roj teeb ternary yog tias nws tsis muaj cov hlau hnyav, thiab kev rov qab los yog Li, P thiab Fe. Tus nqi ntxiv ntawm cov khoom rov qab tau qis dua, yog li yuav tsum tau tsim txoj hauv kev rov qab los ntawm tus nqi qis. Feem ntau muaj ob txoj kev rov ua dua tshiab: txoj kev tua hluav taws thiab txoj kev ntub dej.
Cov txheej txheem tua hluav taws
Txoj kev kho hluav taws kub ib txwm siv feem ntau suav nrog kev kub siab kub ntawm cov khoom siv hluav taws xob, uas hlawv cov pa roj carbon thiab cov organic teeb meem hauv cov electrode fragments. Cov hmoov tshauv ntxiv uas tsis tuaj yeem hlawv yog qhov kawg tshuaj ntsuam kom tau cov hmoov zoo uas muaj cov hlau thiab hlau oxides. Cov txheej txheem ntawm txoj kev no yog qhov yooj yim, tab sis cov txheej txheem kev kho mob yog ntev thiab qhov kev rov qab zoo ntawm cov hlau muaj txiaj ntsig tsawg. Kev txhim kho pyrometallurgical rov qab thev naus laus zis suav nrog tshem cov organic binders los ntawm calcination, sib cais lithium hlau phosphate hmoov los ntawm txhuas ntawv ci kom tau txais cov khoom siv lithium hlau phosphate. Tom qab ntawd, tus nqi tsim nyog ntawm cov khoom siv raw yog ntxiv kom tau txais qhov xav tau molar piv ntawm lithium, hlau, thiab phosphorus, thiab ib qho tshiab lithium hlau phosphate yog synthesized los ntawm high-temperature solid-state method. Raws li kev kwv yees tus nqi, kev txhim kho pyrometallurgical qhuav rov ua dua ntawm cov khib nyiab lithium hlau phosphate roj teeb tuaj yeem ua tiav cov txiaj ntsig, tab sis cov txheej txheem tshiab lithium hlau phosphate uas siv cov txheej txheem rov ua dua no muaj ntau yam impurities thiab kev ua haujlwm tsis ruaj khov.
Cov txheej txheem ntub dej rov qab
Kev rov qab ntub dej yog tsuas yog ua kom yaj cov hlau ions hauv lithium hlau phosphate roj teeb los ntawm cov kua qaub thiab alkali cov ntsiab lus, thiab ntxiv cov kua hlau ions yaj hauv daim ntawv oxides, ntsev, thiab lwm yam los ntawm nag lossis daus, adsorption, thiab lwm yam. Cov txheej txheem tshuaj tiv thaiv feem ntau yog siv H2SO4. , NaOH, H2O2 thiab lwm yam reagents. Cov txheej txheem ntub dej rov qab yog qhov yooj yim, nrog cov cuab yeej siv tsawg, thiab tsim nyog rau kev tsim khoom lag luam. Nws yog qhov feem ntau kawm los ntawm cov kws tshawb fawb thiab tseem yog txoj kev kho mob tseem ceeb rau cov roj teeb lithium-ion pov tseg hauv Suav teb.
Kev ntub dej rov qab ntawm lithium hlau phosphate roj teeb feem ntau yog nyob ntawm qhov rov qab ntawm cov electrode zoo. Thaum siv cov txheej txheem ntub dej kom rov qab tau cov lithium hlau phosphate cathode, thawj kauj ruam yog cais cov txhuas ntawv ci los ntawm cov khoom nquag ntawm cathode. Ib txoj hauv kev yog siv cov tshuaj alkaline kom yaj thiab sau cov kua dej, thaum cov tshuaj nquag tsis hnov ​​​​mob nrog cov tshuaj alkaline thiab tuaj yeem tau los ntawm kev pom. Qhov thib ob txoj kev yog kom yaj cov binder PVDF nrog cov organic hnyav kom cais cov lithium hlau phosphate cathode cov ntaub ntawv los ntawm txhuas ntawv ci. Cov ntawv ci txhuas yog rov qab siv dua, thiab cov tshuaj nquag tuaj yeem kho ntxiv. Cov kuab tshuaj organic tuaj yeem distilled kom ua tiav nws cov khoom siv rov ua dua tshiab. Muab piv rau ob txoj kev, txoj kev thib ob yog ntau tus phooj ywg zoo thiab nyab xeeb. Ib txoj hauv kev los rov qab lithium hlau phosphate los ntawm qhov zoo electrode yog los tsim cov lithium carbonate. Txoj kev rov ua dua no muaj tus nqi qis dua thiab tau txais los ntawm feem ntau cov tuam txhab lithium hlau phosphate rov ua dua tshiab, tab sis cov khoom tseem ceeb ntawm lithium hlau phosphate, hlau phosphate (nrog rau cov ntsiab lus ntawm 95 feem pua), tsis rov siv dua, ua rau cov khoom siv pov tseg.
Txoj kev ntub dej zoo tshaj plaws yog hloov cov ntaub ntawv pov tseg lithium ferrous phosphate cathode rau hauv lithium ntsev thiab hlau phosphate, ua tiav tag nrho cov khoom rov qab ntawm Li, Fe, thiab P. Txhawm rau hloov lithium ferrous phosphate rau hauv lithium ntsev thiab hlau phosphate, ferrous oxide yuav tsum tau ua. oxidized rau trivalent hlau, thiab lithium yog leached los ntawm acid los yog alkali leaching. Qee cov kws tshawb fawb siv oxidation calcination los cais cov ntawv txhuas thiab lithium hlau phosphate, uas tom qab ntawd leached thiab sib cais los ntawm sulfuric acid kom tau cov hlau phosphate. Cov tshuaj yog ces precipitated rau hauv lithium carbonate siv sodium carbonate rau impurity tshem tawm; Cov filtrate yog evaporated thiab crystallized kom tau cov khoom anhydrous sodium sulfate, uas yog muag raws li ib tug byproduct; Crude hlau phosphate yog ntxiv refined kom tau roj teeb qib hlau phosphate, uas yuav siv tau rau kev npaj cov ntaub ntawv lithium hlau phosphate. Cov txheej txheem no tau mus rau ntau xyoo