Ib pab pawg ntawm cov kws tshawb fawb, coj los ntawm Prof. Ma Cheng los ntawm University of Science thiab Technology ntawm Tuam Tshoj (USTC), tau tsim ib qho kev cog lus tshiab ntawm cov khoom siv hluav taws xob hauv lub xeev, ua rau muaj kev vam meej hauv kev lag luam ntawm lithium roj teeb technology.
All-solid-state lithium batteries (ASSLBs) yog touted raws li lub neej yav tom ntej ntawm hluav taws xob tsheb, nrog rau lub peev xwm rau revolutionize lub tsheb kev lag luam. Cov roj teeb no tuav ntau qhov zoo dua li cov roj teeb lithium-ion tam sim no. Qhov tseem ceeb ntawm cov no yog qhov txhim kho kev nyab xeeb ntawm cov roj teeb no, uas hais txog qhov teeb meem tseem ceeb ntawm kev txhawj xeeb txog kev nyab xeeb uas tshwm sim los ntawm cov roj teeb lithium-ion uas tseem tshuav. Tsis tas li ntawd, ASSLBs tuav lub peev xwm ntau dua los txhim kho lub zog ceev.
Kev tsim kho ntawm kev ua haujlwm ASSLBs feem ntau nyob ntawm kev siv cov khoom siv hluav taws xob uas tsim nyog. Qhov no ua rau muaj kev sib tw vim tias qhov ua tau zoo ntawm cov khoom siv hluav taws xob electrolytes uas tam sim no muaj feem ntau raug nqi heev rau kev lag luam siv.
Hais txog qhov teeb meem no, pab pawg tshawb fawb tau ua tiav ib hom tshiab ntawm cov khoom siv hluav taws xob hauv lub xeev hu ua lithium zirconium oxychloride (LZCO). Ib qho txiaj ntsig zoo ntawm cov electrolyte tshiab no yog nws tus nqi qis, uas tshwm sim los ntawm qhov tseeb tias nws tuaj yeem tsim los ntawm cov khoom pheej yig, muaj ntau yam xws li lithium hydroxide monohydrate, lithium chloride, thiab zirconium chloride. Raws li qhov tshwm sim, tus nqi ntawm LZCO ntau lawm tuaj yeem qis li $ 11.60 toj ib kilogram, ib feem ntawm cov nqi ua haujlwm siab sulfide thiab chloride solid-state electrolytes, uas feem ntau raug nqi siab dua $ 190 ib kilogram.
Lithium zirconium oxychloride kuj muaj cov qib kev sib tw. Piv txwv li, cov electrolyte nthuav tawm chav-kub ionic conductivity txog li 2.42 mS cm-1, ib qho ntawm cov khoom siv hluav taws xob siab tshaj plaws tau tshaj tawm ntawm txhua yam ntawm cov khoom siv hluav taws xob hauv lub xeev tam sim no. Tsis tas li ntawd, LZCO qhia tau hais tias muaj kev cuam tshuam zoo heev, ua tiav yuav luag 94.2% qhov ntom ntom hauv qab 300 MPa, ua haujlwm zoo dua qhov compression peev xwm ntawm sulfide thiab chloride solid-state electrolytes, uas feem ntau poob qis dua 90% ntawm tib theem siab.
Kev ntsuam xyuas tau qhia tias tag nrho, kev ua tau zoo ntawm LZCO yog sib npaug nrog qee qhov zoo tshaj plaws sulfide thiab chloride solid-state electrolytes muaj. Qhov tshwj xeeb, cov nickel-nplua nuj txheej txheej cathode-txhim kho ASSLB tsim nrog LZCO nthuav tawm kev ruaj ntseg tshwj xeeb thiab tuaj yeem ua tiav ntau dua 2,000 lub voj voog ntawm chav tsev kub thaum kuaj hauv 12-feeb them ceev ceev.
Kev tsim cov khoom siv tshiab no yog qhov kev nce qib tseem ceeb hauv kev tsim cov khoom siv hluav taws xob zoo, muaj txiaj ntsig zoo-state electrolytes. Qhov kev ua tiav no coj lub zeem muag ntawm kev lag luam ntawm tag nrho cov khoom siv-lub xeev lithium roj teeb tau ze dua, cog lus tias yuav muaj kev hloov pauv ntawm kev lag luam tsheb hluav taws xob nyob rau yav tom ntej.