Cov kws tshawb nrhiav tau kwv yees cov carbon network tshiab, zoo ib yam li graphene, tab sis nrog cov roj teeb ntau dua ua rau roj teeb zoo dua. Graphene yog kev sib cav ua yeeb yaj kiab tshaj plaws ntawm cov pa roj carbon. Nws tau raug muab los ua ib txoj cai kev ua si tshiab rau cov roj teeb lithium-tab sis cov txheej txheem tshiab tuaj yeem ua cov roj teeb ntau dua.
Graphene tuaj yeem pom tau ua lub network atoms, qhov chaw uas txhua carbon atoms, qhov twg muaj cov pa roj teeb uas nyob ib sab los ua me me hexagons. Txawm li cas los xij, cov kws tshawb nrhiav paub tias ntxiv rau cov qauv honeycomb, lwm yam qauv tseem tuaj yeem tsim tawm.
Nov yog cov khoom tshiab tsim los ntawm pab pawg los ntawm University of Marburg hauv Tebchaws Yelemees thiab Aalto University hauv Finland. Lawv coaxed carbon atoms rau hauv cov lus qhia tshiab. Qhov thiaj li hu ua Biphenyl network yog muaj los ntawm hexagons, squares thiab octagagons, uas yog ib daim phiaj ntau dua graphene. Cov kws tshawb nrhiav hais tias, yog li ntawd, nws tau sib txawv ntau, thiab qee qhov kev hwm, ntau dua cov khoom txuag hluav taws xob.
Piv txwv li, Txawm hais tias graphene yog muaj nuj nqis rau nws lub peev xwm ua tus semiconductor, tus tshiab carbon network coj ntau dua li cov hlau. Qhov tseeb, thaum tsuas yog 21 atoms dav, cov kab txaij ntawm cov biphenyl network tuaj yeem siv ua cov xov kab ntawv rau cov khoom siv hluav taws xob. Lawv tau taw qhia tias nyob ntawm daim nplai no, graphene tseem coj zoo li tus semiconductor.
Tus kws sau ntawv tseem ceeb hais tias: "Cov khoom lag luam tshiab no kuj tseem siv tau ua cov khoom siv lithoium-ion, nws muaj peev xwm muaj peev xwm loj dua."
Anode ntawm lub roj teeb lithium-ion feem ntau yog tsim ntawm graphite kis ntawm tooj liab ntawv ci. Nws muaj hluav taws xob conductivity, uas tsis yog qhov tseem ceeb rau kev thim rov qab lim hiam ntawm nws cov khaubncaws sab nraud povtseg, tab sis kuj tseem tuaj yeem ua ntxiv rau ntau txhiab lub voj voog. Qhov no ua rau nws muaj peev txheej hnyav, tab sis kuj yog lub roj teeb uas tuaj yeem ntev ntev tau muaj kev tsis txaus siab.
Txawm li cas los xij, ntau yam ntxiv thiab cov kev xaiv me me raws li cov pa hluav taws xob tshiab no tuaj yeem ua rau roj teeb rau cov khoom siv kom muaj zog. Qhov no yuav ua rau hluav taws xob tsheb thiab lwm yam khoom siv uas siv cov roj ntsha lithium-ion me dua thiab sib dua.
Txawm li cas los xij, nyiam graphene, xam tawm yuav ua li cas tsim cov tshiab version ntawm qhov ntsuas loj yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej yog qhov sib tw tom ntej. Txoj kev sib dhos tam sim no ntawm kev sib dhos zoo nkauj ntawm cov pa roj loj uas muaj cov molecules pib daim ntawv txuas nrog Hexagonal cov saw hlau. Cov kev cuam tshuam tom qab txuas cov saw txuas no los ua cov duab xwmfab thiab outagonal, ua qhov tshwm sim zaum kawg ntawm graphene.
Cov kws tshawb nrhiav tau piav qhia: "Lub tswv yim tshiab yog siv cov khoom siv roj ntsha ua ntej los tsim cov ntaub ntawv biphenyl es tsis txhob tsim cov khoom loj dua kom nws to taub zoo dua."
Lub Sijhawm Post: Jan-06-2022
