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What is This / Nuus / Ingenieurs het 'n skeier ontwikkel wat gasvormige elektroliete stabiliseer om ultra-lae temperatuur batterye veiliger te maak Ingenieurs het 'n skeier ontwikkel wat gasvormige elektroliete stabiliseer om ultra-lae temperatuur batterye veiliger te maak Volgens buitelandse mediaberigte het nano-ingenieurs aan die Universiteit van Kalifornië San Diego 'n batteryskeier ontwikkel wat as 'n versperring tussen die katode en anode kan dien om te verhoed dat die gasvormige elektroliet in die battery verdamp. Die nuwe diafragma keer dat die interne druk van die storm ophoop en sodoende verhoed dat die battery swel en ontplof.
Die navorsingsleier, Zheng Chen, professor in nano-ingenieurswese aan die Jacobs Skool vir Ingenieurswese aan die Universiteit van Kalifornië, San Diego, het gesê: "Deur gasmolekules vas te vang, kan die membraan optree as 'n stabiliseerder vir vlugtige elektroliete."
Die nuwe skeier kan batterywerkverrigting by ultra-lae temperature verbeter. Die batterysel wat die diafragma gebruik, kan teen minus 40°C werk, en die kapasiteit kan so hoog as 500 milliampere-uur per gram wees, terwyl die kommersiële diafragmabattery in hierdie geval amper geen krag het nie. Navorsers sê selfs al word dit vir twee maande ongebruik gelaat, is die batteryselkapasiteit steeds hoog. Hierdie prestasie wys dat die diafragma ook die bergingslewe kan verleng. Hierdie ontdekking stel navorsers in staat om hul doel verder te bereik: om batterye te vervaardig wat elektrisiteit kan verskaf aan voertuie in ysige omgewings, soos ruimtetuie, satelliete en diepseeskepe.
Hierdie navorsing is gebaseer op 'n studie in die laboratorium van Ying Shirley Meng, professor in nano-ingenieurswese aan die Universiteit van Kalifornië, San Diego. Hierdie navorsing gebruik 'n spesifieke vloeibare gas-elektroliet om 'n battery te ontwikkel wat vir die eerste keer goeie werkverrigting in 'n omgewing minus 60°C kan handhaaf. Onder hulle is die vloeibare gas-elektroliet 'n gas wat vloeibaar gemaak word deur druk toe te pas en is meer bestand teen lae temperature as tradisionele vloeibare elektroliete.
Maar hierdie soort elektroliet het 'n gebrek; dit is maklik om van vloeistof na gas te verander. Chen het gesê: "Hierdie probleem is die grootste veiligheidsprobleem vir hierdie elektroliet." Die druk moet verhoog word om die vloeistofmolekules te kondenseer en die elektroliet in 'n vloeibare toestand te hou om die elektroliet te gebruik.
Chen se laboratorium het saam met Meng en Tod Pascal, professor in nano-ingenieurswese aan die Universiteit van Kalifornië, San Diego, saamgewerk om hierdie probleem op te los. Deur die kundigheid van rekenaarkundiges soos Pascal met navorsers soos Chen en Meng te kombineer, is ’n metode ontwikkel om die verdampte elektroliet vloeibaar te maak sonder om te veel druk vinnig toe te pas. Die personeel hierbo genoem is verbonde aan die Materials Research Science and Engineering Centre (MRSEC) van die Universiteit van Kalifornië, San Diego.
Hierdie metode is ontleen aan 'n fisiese verskynsel waarin gasmolekules spontaan kondenseer wanneer hulle in klein nanoskaalruimtes vasgevang word. Hierdie verskynsel word kapillêre kondensasie genoem, wat die gas kan laat vloeibaar word teen 'n laer druk. Die navorsingspan het hierdie verskynsel gebruik om 'n batteryskeier te bou wat die elektroliet in ultra-lae temperatuur batterye kan stabiliseer, 'n vloeibare gas elektroliet gemaak van fluormetaangas. Die navorsers het 'n poreuse kristallyne materiaal genaamd 'n metaal-organiese raamwerk (MOF) gebruik om die membraan te skep. Die unieke ding van MOF is dat dit vol piepklein porieë is, wat fluormetaangasmolekules kan vasvang en teen relatief lae druk kondenseer. Fluormetaan krimp byvoorbeeld gewoonlik by minus 30°C en het 'n krag van 118 psi; maar as MOF gebruik word, is die kondensasiedruk van poreus by dieselfde temperatuur slegs 11 psi.
Chen het gesê: "Hierdie MOF verminder aansienlik die druk wat nodig is vir die elektroliet om te werk. Daarom kan ons battery 'n groot hoeveelheid kapasiteit teen lae temperature verskaf sonder agteruitgang." Die navorsers het 'n MOF-gebaseerde skeier in 'n litium-ioonbattery getoets. . Die litium-ioon battery bestaan uit 'n fluorkoolstof katode en 'n litium metaal anode. Dit kan dit vul met 'n gasvormige fluormetaanelektroliet teen 'n interne druk van 70 psi, veel laer as die druk wat nodig is om fluorometaan te vloeibaar maak. Die battery kan steeds 57% van sy kamertemperatuurkapasiteit by minus 40°C handhaaf. Daarenteen, by dieselfde temperatuur en druk, is die krag van 'n kommersiële diafragmabattery wat 'n gasvormige elektroliet wat fluormetaan bevat, byna nul.
Die mikroporieë gebaseer op die MOF-skeier is die sleutel, want hierdie mikroporieë kan meer elektroliete in die battery laat vloei selfs onder verminderde druk. Die kommersiële diafragma het groot porieë en kan nie gasvormige elektrolietmolekules onder verminderde druk behou nie. Maar mikroporositeit is nie die enigste rede waarom die diafragma goed werk onder hierdie toestande nie. Die diafragma wat deur die navorsers ontwerp is, laat die porieë ook toe om 'n aaneenlopende pad van die een kant na die ander te vorm en sodoende te verseker dat litiumione vrylik deur die diafragma kan vloei. In die toets is die ioniese geleidingsvermoë van die battery wat die nuwe diafragma gebruik by minus 40°C tien keer dié van die battery wat die kommersiële diafragma gebruik.
Chen se span toets tans MOF-gebaseerde skeiers op ander elektroliete. Chen het gesê: "Ons het soortgelyke effekte gesien. Deur hierdie MOF as 'n stabiliseerder te gebruik, kan verskeie elektrolietmolekules geadsorbeer word om batteryveiligheid te verbeter, insluitend tradisionele litiumbatterye met vlugtige elektroliete."