Cov kws tshawb nrhiav tau tsim ib txoj kev siv dua tshiab uas tuaj yeem rov qab tau 100% ntawm cov txhuas thiab 98% ntawm cov lithium hauv cov roj teeb tsheb fais fab.
Cov kws tshawb fawb Swedish hais tias lawv tau tsim ib txoj hauv kev tshiab, zoo dua rau kev siv cov roj teeb tsheb fais fab.
"Vim tias txoj kev no tuaj yeem nthuav dav ntxiv, peb vam tias nws yuav raug siv rau hauv kev lag luam hauv xyoo tom ntej," tus thawj coj kev tshawb fawb Martina Petranikova hais.
Hauv kev siv hydrometallurgy ib txwm muaj, txhua yam hlau hauv cov roj teeb tsheb fais fab raug yaj rau hauv cov kua qaub inorganic.
Cov "Immurities" xws li txhuas thiab tooj liab ces raug tshem tawm thiab cov hlau muaj nqis xws li cobalt, nickel, manganese thiab lithium raug rov qab tau.
Txawm hais tias cov txhuas thiab tooj liab seem me me xwb los, nws yuav tsum tau ua ntau kauj ruam ntxuav kom huv, thiab txhua kauj ruam hauv cov txheej txheem no txhais tau tias yuav poob lithium.
Cov kws tshawb fawb ntawm Sweden's Chalmers University of Technology tau tsim ib txoj kev siv rov qab uas tuaj yeem rov qab tau 100% ntawm cov txhuas thiab 98% ntawm cov lithium hauv cov roj teeb tsheb fais fab.
Nws cuam tshuam txog kev hloov pauv cov txheej txheem tam sim no thiab feem ntau ua cov lithium thiab txhuas.
Tib lub sijhawm, kev poob ntawm cov khoom siv raw muaj nqis xws li nickel, cobalt thiab manganese raug txo kom tsawg.
"Txog rau tam sim no, tsis muaj leej twg nrhiav tau cov xwm txheej zoo los siv oxalic acid los cais cov lithium ntau heev thaum tshem tawm tag nrho cov txhuas tib lub sijhawm," Leah Rouquette, tus tub ntxhais kawm tiav qib siab hauv Department of Chemistry thiab Chemical Engineering ntawm Chalmers University of Technology hais.
Vim tias txhua lub roj teeb muaj txhuas, peb yuav tsum muaj peev xwm tshem nws tawm yam tsis poob lwm yam hlau.
Hauv lawv lub chaw kuaj roj teeb rov ua dua tshiab, Rouquette thiab tus thawj coj tshawb fawb Petranikova tau muab cov roj teeb tsheb siv lawm thiab lawv cov khoom uas raug tsoo pov tseg rau hauv lub tshuab nqus pa taws.
Cov hmoov dub uas zom me me no yaj rau hauv cov kua organic hu ua oxalic acid, uas yog cov khoom xyaw ntsuab dua uas pom muaj nyob rau hauv cov nroj tsuag xws li rhubarb thiab spinach.
Muab cov hmoov thiab cov kua tso rau hauv lub tshuab zoo li lub tshuab sib tov hauv chav ua noj. Ntawm no, cov txhuas thiab lithium hauv lub roj teeb raug yaj rau hauv oxalic acid, ua rau cov hlau seem nyob rau hauv daim ntawv khov.
Kauj ruam kawg hauv cov txheej txheem yog cais cov hlau no kom rho tawm lithium, uas tom qab ntawd tuaj yeem siv los ua cov roj teeb tshiab.
"Vim tias cov hlau no muaj cov yam ntxwv sib txawv heev, peb tsis xav tias nws yuav nyuaj rau cais lawv. Peb txoj kev yog ib txoj hauv kev tshiab zoo los rov ua dua cov roj teeb uas tsim nyog tshawb nrhiav ntxiv," Rouquette hais.
Pab neeg tshawb fawb ntawm Petranikova tau siv ntau xyoo los ua kev tshawb fawb tshiab rau kev siv cov hlau rov ua dua tshiab hauv cov roj teeb lithium-ion.
Nws koom nrog ntau yam kev koom tes nrog cov tuam txhab uas koom nrog kev siv cov roj teeb tsheb fais fab dua tshiab. Pawg neeg no yog tus khub koom tes hauv cov haujlwm tshawb fawb thiab kev txhim kho loj thiab nws cov npe suav nrog Volvo thiab Northvolt.