Kab lus no tau raug tshuaj xyuas raws li Science X cov txheej txheem kho thiab cov cai. Cov kws kho mob tau hais txog cov yam ntxwv hauv qab no thaum ua kom muaj kev ncaj ncees ntawm cov ntsiab lus:
Cov roj teeb lithium-ion pov tseg los ntawm cov xov tooj ntawm tes, laptops thiab ntau lub tsheb hluav taws xob tau teeb tsa, tab sis cov kev xaiv rov ua dua tseem muaj feem cuam tshuam rau kev siv hluav taws xob lossis tshuaj tua hluav taws xob ua tsis tiav. Cov txheej txheem tam sim no tuaj yeem tsim teeb meem ib puag ncig thiab nyuaj rau kev lag luam tsim khoom ntawm kev lag luam.
Cov txheej txheem ib txwm siv rov ua dua qee cov khoom siv roj teeb thiab tso siab rau caustic alkalis, inorganic acids thiab tshuaj lom neeg uas tuaj yeem ua kom pom cov impurities. Extracting tseem ceeb hlau kuj yuav tsum tau complex sib cais thiab los nag. Txawm li cas los xij, cov khoom siv rov ua dua tshiab xws li cobalt thiab lithium tuaj yeem txo cov pa phem, kev vam khom ntawm cov khoom txawv teb chaws thiab cov saw hlau txuas.
Cov kws tshawb fawb ntawm US Department of Energy's Oak Ridge National Laboratory tau ua tiav ib txoj hauv kev ua kom cov roj teeb yaj hauv cov kua dej kom txo tau cov tshuaj phom sij siv hauv cov txheej txheem. Lawv cov kev tshawb fawb tau luam tawm nyob rau hauv phau ntawv Journal Energy Storage Materials.
Cov kev daws teeb meem yooj yim, ua tau zoo thiab ib puag ncig zoo tsim los ntawm ORNL cov kws tshawb fawb tau kov yeej cov teeb meem loj uas tau ntsib nrog cov txheej txheem dhau los.
Cov roj teeb uas siv tau yog tsau rau hauv cov tshuaj ntawm cov organic citric acid (naturally pom nyob rau hauv citrus txiv hmab txiv ntoo) yaj nyob rau hauv ethylene glycol, ib tug antifreeze feem ntau siv nyob rau hauv cov neeg siv khoom xws li xim thiab tshuaj pleev ib ce. Citric acid los ntawm qhov chaw ruaj khov thiab muaj kev nyab xeeb dua li cov inorganic acids. Qhov kev daws teeb meem zoo ib puag ncig no muab cov txheej txheem muaj txiaj ntsig zoo rau kev sib cais thiab rov ua dua cov hlau hauv lub roj teeb lub zog electrode, hu ua cathode.
"Vim tias cov cathode muaj cov ntaub ntawv tseem ceeb, nws yog qhov kim tshaj plaws ntawm txhua lub roj teeb, suav txog ntau dua 30 feem pua ​​​​ntawm nws cov nqi," said Yaokai Bai, tus tswv cuab ntawm ORNL pab pawg tshawb fawb roj teeb. "Peb txoj hauv kev tuaj yeem txo cov nqi roj teeb lub sijhawm." Txoj kev tshawb no tau ua nyob rau ntawm Oak Ridge National Laboratory lub chaw tsim khoom roj teeb, qhov loj tshaj plaws qhib cua roj teeb kev tshawb fawb thiab kev tsim kho chaw hauv Tebchaws Meskas.
Cov cuab yeej ua haujlwm tsim muaj tso cai yuav luag 100% ntawm cobalt thiab lithium kom leached los ntawm cathode yam tsis qhia impurities rau hauv lub cev. Nws kuj tseem muaj peev xwm sib cais cov tshuaj hlau zoo los ntawm lwm cov residues. Qhov zoo tshaj plaws, nws qhov kev ua haujlwm thib ob yog kom rov qab tau ntau dua 96% ntawm cobalt hauv ob peb teev yam tsis tau ntxiv cov tshuaj ntxiv, uas feem ntau yog cov txheej txheem phau ntawv nyuaj rau ntsuas qib acid.
"Qhov no yog thawj zaug uas ib qho kev daws teeb meem suav nrog kev ua haujlwm ntawm leaching thiab kev ua haujlwm," tus thawj coj tshawb fawb Lu Yu tau hais. "Nws yog qhov nthuav kom pom tias cobalt nag lossis daus thiab nyob tsis muaj kev cuam tshuam ntxiv. Peb tsis xav txog qhov no."
Tshem tawm qhov xav tau ntawm cov tshuaj ntxiv txo cov nqi thiab zam kev tsim cov khoom lag luam lossis cov khoom pov tseg thib ob. "Peb zoo siab tias cov txheej txheem rov ua dua tshiab no tau tsim los ntawm peb cov kws tshawb fawb tuaj yeem ua txoj hauv kev rau kev rov ua dua tshiab ntawm cov khoom siv roj teeb tseem ceeb," said Ilyas Belharouaq, tus kws tshawb fawb thiab tus thawj coj ntawm Electrification Division ntawm Oak Ridge National Laboratory.
Bai hais tias cov khoom leaching ntawm citric acid thiab ethylene glycol tau kawm ua ntej, tab sis txoj kev no siv cov kua qaub ntau dua thiab qis dua thiab tsis zoo.
"Peb xav tsis thoob li sai npaum li cas nws tawm ntawm kev daws teeb meem," Bai hais. "Nrog cov organic acids feem ntau yuav siv sij hawm 10 mus rau 12 teev, tab sis qhov no tsuas yog siv ib teev xwb." Cov kev daws teeb meem niaj hnub siv cov inorganic acids kuj qeeb vim tias lawv muaj dej, uas nws qhov kub hnyiab txwv qhov kub thiab txias.
Cov ntaub ntawv ntxiv: Lu Yu et al., Kev sib cais zoo thiab kev sib koom ua ke rau kev yooj yim cathode recycling, Zog Cia Khoom (2023). DOI: 10.1016/j.ensm.2023.103025
Yog tias koj ntsib qhov typo, tsis raug, lossis xav xa daim ntawv thov los hloov cov ntsiab lus ntawm nplooj ntawv no, thov siv daim foos no. Rau cov lus nug dav dav, thov siv peb daim foos tiv tauj. Rau kev tawm tswv yim dav dav, siv cov lus qhia pej xeem hauv qab no (ua raws li cov lus qhia).
Koj cov lus teb tseem ceeb heev rau peb. Txawm li cas los xij, vim muaj cov lus ntim siab, peb tsis tuaj yeem lav cov lus teb tus kheej.
Koj tus email chaw nyob tsuas yog siv los qhia rau cov neeg tau txais kev pabcuam uas xa email. Tsis yog koj qhov chaw nyob lossis tus neeg txais qhov chaw nyob yuav tsis raug siv rau lwm lub hom phiaj. Cov ntaub ntawv koj nkag mus yuav tshwm sim hauv koj tus email thiab yuav tsis muab los ntawm Tech Xplore hauv ib daim ntawv.
Lub vev xaib no siv cov ncuav qab zib los pab kev taw qhia, txheeb xyuas koj qhov kev siv peb cov kev pabcuam, sau cov ntaub ntawv tshaj tawm tus kheej, thiab muab cov ntsiab lus los ntawm peb tog. Los ntawm kev siv peb lub vev xaib, koj lees paub tias koj tau nyeem thiab nkag siab txog peb Txoj Cai Tswjfwm Ntiag Tug thiab Cov Cai Siv.