Thaum Lub Yim Hli 21st, Prof. MA Cheng los ntawm University of Science thiab Technology ntawm Tuam Tshoj (USTC) thiab nws cov neeg koom tes tau npaj cov tswv yim zoo los daws cov teeb meem kev sib cuag electrode-electrolyte uas yog txwv txoj kev loj hlob ntawm cov khoom siv hluav taws xob hauv lub xeev Li roj teeb. Cov khoom siv-khoom sib xyaw electrode tsim txoj hauv kev no nthuav tawm cov peev txheej tshwj xeeb thiab kev ua tau zoo.
Hloov cov organic kua electrolyte nyob rau hauv cov pa Li-ion roj teeb nrog cov khoom electrolytes tuaj yeem txo cov teeb meem kev nyab xeeb, thiab muaj peev xwm ua rau "iav qab nthab" rau kev txhim kho lub zog. Txawm li cas los xij, cov khoom siv hluav taws xob tseem ceeb tseem yog cov khoom khib nyiab. Txij li thaum kev sib cuag ntawm ob lub khib nyiab yog ze li tsis tuaj yeem ua kom zoo li qhov nruab nrab ntawm cov khoom thiab cov kua, tam sim no cov roj teeb raws li cov khoom siv electrolytes feem ntau pom cov khoom siv hluav taws xob tsis zoo-electrolyte sib cuag thiab tsis zoo tag nrho ntawm tes ua yeeb yam.
"Qhov teeb meem ntawm electrode-electrolyte sib cuag ntawm cov roj teeb hauv lub xeev yog me ntsis zoo li qhov luv tshaj stave ntawm lub thoob ntoo," said Prof. MA Cheng los ntawm USTC, tus thawj coj ntawm txoj kev tshawb no. "Qhov tseeb, xyoo no cov kws tshawb fawb tau tsim ntau cov khoom siv hluav taws xob zoo thiab cov khoom siv hluav taws xob, tab sis kev sib cuag tsis zoo ntawm lawv tseem txwv kev ua haujlwm ntawm Li-ion kev thauj mus los."
Hmoov zoo, MA lub tswv yim yuav kov yeej qhov kev sib tw loj heev. Txoj kev tshawb no pib nrog lub atom-by-atom kuaj ntawm impurity theem nyob rau hauv ib tug qauv, perovskite-structured khoom electrolyte. Txawm hais tias cov qauv siv lead ua sib txawv heev ntawm cov impurity thiab cov khoom electrolyte, lawv tau pom los ua epitaxial interfaces. Tom qab cov txheej txheem ntxaws ntxaws thiab tshuaj ntsuam xyuas, cov kws tshawb nrhiav pom tias cov theem impurity yog isostructural nrog lub peev xwm Li-nplua nuj txheej electrodes. Qhov ntawd yog hais tias, tus qauv qauv khoom electrolyte tuaj yeem crystallize ntawm "tus qauv" tsim los ntawm atomic moj khaum ntawm cov khoom siv hluav taws xob ua haujlwm siab, ua rau muaj kev sib txuam ntawm atomically intimate.
"Qhov no yog qhov xav tsis thoob," thawj tus kws sau ntawv LI Fuzhen, uas tam sim no kawm tiav ntawm USTC. "Lub xub ntiag ntawm impurities hauv cov khoom yog qhov tshwm sim ntau heev, yog li feem ntau ntawm cov sij hawm lawv yuav tsis quav ntsej. Txawm li cas los xij, tom qab ua tib zoo saib lawv, peb pom qhov kev xav tsis zoo ntawm tus cwj pwm epitaxial, thiab nws ncaj qha txhawb peb lub tswv yim los txhim kho cov khoom sib cuag. "
Piv nrog rau qhov uas tau txais kev ua kom txias txias, lub tswv yim uas cov kws tshawb nrhiav tuaj yeem paub txog kev sib raug zoo ntawm cov khoom siv hluav taws xob thiab cov hluav taws xob ntawm qhov ntsuas atomic, raws li tau pom hauv daim duab atomic-resolution electron microscopy duab. (Muab los ntawm MA pab pawg.)
Ua kom zoo dua ntawm qhov pom tshwm sim, cov kws tshawb fawb txhob txwm ua kom cov hmoov amorphous nrog tib lub ntsiab lus raws li perovskite-structured khoom electrolyte nyob rau saum npoo ntawm Li-nplua nuj txheej txheej, thiab ua tiav tiav kev sib cuag, seamless ntawm ob cov khoom siv hauv cov khoom siv electrode. Nrog rau qhov teeb meem kev sib cuag electrode-electrolyte tau hais txog, xws li cov khoom siv hluav taws xob sib xyaw ua ke tau xa tus nqi peev xwm txawm tias piv rau qhov los ntawm cov khoom siv hluav taws xob sib xyaw ua kua. Qhov tseem ceeb tshaj, cov kws tshawb fawb kuj pom tias hom kab mob epitaxial khoom-khoom sib tiv tauj tuaj yeem ua rau cov lattice loj tsis sib haum, thiab yog li lub tswv yim uas lawv tau thov kuj tseem siv tau rau ntau lwm cov khoom siv perovskite electrolytes thiab txheej electrodes.
MA tau hais tias "Qhov haujlwm no tau taw qhia qhov kev coj ua uas tsim nyog ua," MA hais. "Kev siv lub hauv paus ntsiab lus ntawm no rau lwm cov ntaub ntawv tseem ceeb tuaj yeem ua rau muaj kev ua tau zoo ntawm tes thiab kev tshawb fawb zoo dua. Peb tab tom tos ntsoov rau nws."
Cov kws tshawb fawb npaj siab mus txuas ntxiv lawv txoj kev tshawb fawb hauv cov lus qhia no, thiab siv cov tswv yim npaj rau lwm lub peev xwm loj, muaj peev xwm cathodes.
Txoj kev tshawb no tau luam tawm ntawm Matter, ib phau ntawv xov xwm tseem ceeb ntawm Cell Xovxwm, hu ua "Atomically Intimate Sib cuag ntawm Khoom Electrolytes thiab Electrodes rau Li Roj Teeb". Thawj tus kws sau ntawv yog LI Fuzhen, tus kawm tiav ntawm USTC. Prof. MA Cheng cov neeg koom tes suav nrog Prof. NAN Ce-Wen los ntawm Tsinghua University thiab Dr. ZHOU Lin los ntawm Ames Laboratory.
(Lub Tsev Kawm Ntawv ntawm Chemistry thiab Material Sciences)
Daim ntawv txuas: https://www.cell.com/matter/fulltext/S2590-2385(19)30029-3
Post lub sij hawm: Jun-03-2019