Ib hom tshiab ntawm cov hlau lead raws li anode yuav raug siv nyob rau hauv tiam tom ntej ntawm lithium roj teeb

Cov roj teeb lithium ion muab lub zog rau txhua yam khoom siv, los ntawm smartphones mus rau laptops mus rau lub tsheb fais fab. Cov kws tshawb fawb thoob ntiaj teb tau tshawb nrhiav cov khoom tshiab thiab txhim kho kom tsim tau cov roj teeb zoo dua rau cov no thiab lwm yam kev siv.

Cov kws tshawb fawb ntawm Argonne National Laboratory ntawm US Department of Energy (DOE) tau tshaj tawm cov hluav taws xob tshiab tsim los rau cov roj teeb lithium-ion siv cov khoom siv qis xws li txhuas thiab carbon. Cov pab txhawb rau qhov kev tshawb pom tseem ceeb no kuj suav nrog cov kws tshawb fawb los ntawm Northwestern University, Brookhaven National Laboratory, thiab Ulsan National Institute of Science thiab Technology (UNIST).

Eungje Lee, Tus Thawj Saib Xyuas Kev Tshawb Fawb thiab Cov Khoom Siv Hluav Taws Xob ntawm Kev Tshawb Fawb Kev Tshawb Fawb thiab Kev Tshawb Fawb (CSE) ntawm Argonne University, tau hais tias, "Peb qhov kev tshawb fawb muaj txiaj ntsig zoo rau kev tsim cov nqi qis, kev ua haujlwm siab, thiab cov roj ntsha lithium-ion muaj zog uas tuaj yeem muab lub zog rau hybrid. thiab txhua lub tsheb hluav taws xob. "

Lub hauv paus ntsiab lus ua haujlwm ntawm lithium-ion roj teeb yog ntxig lithium ions rau hauv lub anode thaum them nyiaj thiab tshem tawm lawv thaum tawm. Tam sim no graphite anode tuaj yeem dhau ntau txhiab tus nqi tawm mus, tab sis nws zoo li tau mus txog qhov txwv ntawm lub zog cia.

Lee tau hais tias, "Peb tau txiav txim siab los kawm cov hmoov txhuas los hloov cov graphite ua cov khoom siv anode. Lead yog tshwj xeeb tshaj yog txaus nyiam vim nws yog ob qho tib si pheej yig thiab pheej yig. Tsis tas li ntawd, vim muaj keeb kwm ntev ntawm txhuas-acid roj teeb muab lub zog pab rau lub tsheb. , nws muaj cov khoom siv ua tiav thiab yog ib qho khoom siv rov ua dua tshiab hauv ntiaj teb hauv Tebchaws Meskas, tam sim no tus nqi rov qab yog 99%.

Li hais ntxiv, "Peb cov anode tshiab tuaj yeem muab cov nyiaj tau los tshiab rau kev lag luam loj uas tam sim no koom nrog cov roj teeb txhuas-acid roj teeb tsim thiab rov ua dua tshiab."

Lub anode ntawm pab neeg no tsis yog ib tug zoo tib yam txhuas phaj, tab sis suav tsis txheeb microscopic hais nrog complex qauv: txhuas nanoparticles embedded nyob rau hauv ib tug carbon matrix thiab surrounded los ntawm ib tug nyias plhaub ntawm txhuas oxide. Txawm hais tias cov qauv no suab nyuaj, pab pawg tau tsim ib txoj hauv kev yooj yim, tus nqi qis.

"Peb txoj kev koom nrog kev sib xyaw cov hlau lead oxide loj nrog cov hmoov carbon thiab oscillating rau ob peb teev kom txog thaum cov khoom siv me me nrog cov qauv ntawm lub plhaub uas xav tau," piav qhia Christopher Johnson, tus kws tshawb fawb tseem ceeb ntawm txoj haujlwm thiab tus kws tshawb fawb zoo ntawm Argonne, CSE.

Kev ntsuam xyuas hauv cov roj teeb hauv chav kuaj nrog ntau tshaj 100 lub voj voog tawm tau pom tias lub zog cia ntawm cov hlau lead tshiab raws li nanocomposite anode yog ob npaug ntawm cov graphite anode tam sim no (tus qauv rau tib qhov hnyav). Kev ua haujlwm ruaj khov thaum lub caij caij tsheb kauj vab tuaj yeem ua tau, vim tias qhov me me me tuaj yeem txo qhov kev ntxhov siab, thaum cov pa roj carbon matrix muab cov kev xav tau thiab ua raws li qhov tsis tuaj yeem tiv thaiv kev puas tsuaj rau ntim nthuav dav thaum lub caij tsheb kauj vab. Pab neeg tshawb fawb tseem pom tias ntxiv me me ntawm fluoroethyl carbonate rau tus qauv electrolyte ua rau kev ua tau zoo.

Cov kws tshawb fawb tau kawm txog kev them nyiaj thiab tso tawm cov txheej txheem ntawm cov anode ntawm GeoSoilEnviro Advanced Radiation Source Center (GSECARS) ua los ntawm University of Chicago, nyob hauv Argona, DOE Science User Facility Office. Los ntawm synchrotron X-ray diffraction, lawv muaj peev xwm taug qab cov theem hloov ntawm cov khoom tsis zoo electrode thaum them thiab tawm. Cov txiaj ntsig zoo li no, ua ke nrog cov txiaj ntsig tau sau los ntawm Atomic thiab Nanoscale Characterization Center ntawm Northwestern University thiab DOE User Facility National Synchrotron Light Source II hauv Brookhaven, qhia cov tshuaj electrochemical uas tshwm sim ntawm cov hlau lead thiab lithium ions thaum lub sij hawm them thiab tawm, uas yog yav dhau los tsis paub.

Lee hais tias, "Qhov kev pom tseem ceeb no yuav yog qhov tseem ceeb rau kev nkag siab txog cov tshuaj tiv thaiv ntawm cov hlau lead thiab silicon anodes."

Silicon anode yog lwm tus nqi qis thiab kev ua haujlwm siab rau cov tiam tom ntej ntawm lithium-ion roj teeb.

Johnson tau hais tias, "Peb qhov kev tshawb pom nyuaj rau kev nkag siab tam sim no ntawm cov khoom siv hluav taws xob no." Peb qhov kev tshawb pom kuj tseem muaj qhov cuam tshuam zoo rau kev tsim cov khoom siv hluav taws xob qis, kev ua haujlwm siab anode rau kev thauj mus los thiab lub zog ruaj khov, xws li cov khoom siv hluav taws xob rov qab rau hauv daim phiaj hluav taws xob. "

Pab neeg no cov ntawv tau luam tawm nyob rau hauv cov ntawv luam tawm tsis ntev los no Advanced Functional Materials.