Silicon-raws li cathodes stabilize Li-S hlwb. Cov nyhuv: ntau tshaj 2 lub voj voog es tsis txhob ntau lub kaum os

Cov kws tshawb fawb los ntawm Daegu Institute of Science thiab Technology (DGIST, Kaus Lim Qab Teb) tau tsim cov silicon-based cathode uas xav tias yuav tiv taus ntau dua 2 lub voj voog hauv Li-S hlwb. Classic lithium-ion hlwb siv cov silicon ntshiab hauv cov anodes kom ntxiv thiab maj mam hloov graphite. Silicon oxide tau siv ntawm no, thiab silicon dioxide tau siv hauv cathode.

Li-S cell = lithium anode, silicon dioxide cathode nrog sulfur

Li-S hlwb raug suav hais tias yog qhov nthuav vim tias lawv lub zog siab ceev, qhov hnyav thiab cov nqi tsim khoom tsawg. Txawm li cas los xij, tsis muaj leej twg tseem tau tswj hwm los tsim ib qho version uas yuav tiv taus ntau tshaj li ob peb lub hlis them nqi. Tag nrho vim yog lithium polysulfides (LiPS), uas yaj hauv cov electrolyte thaum lub sij hawm tso tawm thiab hnov mob nrog cov anode, txo nws lub peev xwm thiab, vim li ntawd, ua kom puas lub roj teeb.

Nws yog qhov ua tau tias cov kws tshawb fawb South Kauslim tau nrhiav kev daws teeb meem. Hloov cov khoom siv carbon (xws li graphite), lawv siv cov cathode. lamellar qauv ntawm mesoporous silica (POMS).

Cov qauv lamellar yog to taub, thaum mesoporosity yog hais txog qhov tsub zuj zuj ntawm pores (kab noj hniav) hauv silica uas muaj lub hom phiaj loj, qhov ntom ntom thiab me me dispersion (qhov chaw). Nws yog me ntsis zoo li yog tias koj tsis tu ncua los ntawm cov phiaj uas nyob ib sab ntawm qee yam ntawm silicate los ua ib lub sieve.

DGIST cov kws tshawb fawb siv cov qhov no los tso cov sulfur hauv lawv (Daim duab a). Thaum tso tawm, cov sulfur dissolves thiab tsim lithium polysulfides (LiPS) nrog lithium. Yog li, tus nqi ntws, tab sis LiPS tseem nyob ze ntawm lub cathode vim yog cov pa roj carbon monoxide ntxiv (cov qauv dub, daim duab b).

Thaum them nyiaj, LiPS tso tawm lithium, uas rov qab mus rau lithium anode. Ntawm qhov tod tes, sulfur yog hloov mus rau silica. Tsis muaj LiPS to rau lub anode, tsis muaj hlau puas.

Li-S roj teeb tsim nyob rau hauv txoj kev no khaws cia siab thiab ruaj khov rau ntau tshaj 2 lub voj voog ua haujlwm. Tsawg kawg yog 500-700 lub voj voog ntawm kev ua haujlwm yog suav tias yog tus qauv rau cov lithium-ion hlwb, txawm hais tias nws yuav tsum tau ntxiv tias cov lithium-ion ua haujlwm tau zoo tuaj yeem tiv taus ntau txhiab lub voj voog.