Ma cathodes opangidwa ndi silicon amakhazikika ma cell a Li-S. Zotsatira zake: kupitilira kwa 2 kulipiritsa m'malo mwa khumi ndi awiri
Asayansi ochokera ku Daegu Institute of Science and Technology (DGIST, South Korea) apanga cathode yopangidwa ndi silicon yomwe ikuyembekezeka kupirira maulendo opitilira 2 m'maselo a Li-S. Maselo apamwamba a lithiamu-ion amagwiritsa ntchito silicon yoyera mu anode kuti agwirizane ndikusintha pang'onopang'ono graphite. Silicon oxide idagwiritsidwa ntchito pano, ndipo silicon dioxide idagwiritsidwa ntchito mu cathode.
Li-S cell = lithiamu anode, silicon dioxide cathode ndi sulfure
Maselo a Li-S amaonedwa kuti ndi osangalatsa chifukwa cha kuchuluka kwa mphamvu zawo, kulemera kwawo komanso mtengo wotsika wopanga. Komabe, palibe amene adakwanitsa kupanga mtundu womwe ungapirire maulendo angapo olipira. Zonse chifukwa cha lithiamu polysulfides (LiPS), zomwe zimasungunuka mu electrolyte pamene zimatuluka ndikuchitapo kanthu ndi anode, kuchepetsa mphamvu yake ndipo, chifukwa chake, kuwononga batri.
N’kutheka kuti ofufuza a ku South Korea apeza njira yothetsera vutoli. M'malo mwa zinthu zopangidwa ndi kaboni (monga graphite), adagwiritsa ntchito cathode. Lamellar kapangidwe ka mesoporous silika (POMS).
Mapangidwe a lamellar ndi omveka, pamene mesoporosity imatanthawuza kudzikundikira kwa pores (mitsempha) mu silika yomwe ili ndi kukula kwa chandamale, kachulukidwe ka malo ndi kufalikira kwakung'ono (gwero). Izi zimakhala ngati kuponya mbale zoyandikana zamtundu wina wa silicate pafupipafupi kuti mupange sieve.
Asayansi a DGIST adagwiritsa ntchito mabowowa kuyikamo sulfure (Chithunzi a). Pakutha, sulfure amasungunuka ndikupanga lithiamu polysulfides (LiPS) ndi lithiamu. Choncho, ndalamazo zimayenda, koma LiPS imakhalabe yotsekedwa pafupi ndi cathode chifukwa cha carbon factor yowonjezera yosadziwika (mapangidwe akuda, chithunzi b).
Pakulipira, LiPS imatulutsa lithiamu, yomwe imabwereranso ku anode ya lithiamu. Kumbali ina, sulfure imasinthidwa kukhala silika. Palibe kutayikira kwa LiPS ku anode, palibe kuwonongeka kwachitsulo.
Batire ya Li-S yopangidwa motere imakhalabe ndi mphamvu zambiri komanso kukhazikika kwa mizere yopitilira 2 yogwira ntchito. Osachepera 500-700 m'zinthu ntchito amaonedwa muyezo kwa tingachipeze powerenga Li-ion maselo, ngakhale ziyenera kuwonjezeredwa kuti bwino kukonzedwa maselo lifiyamu-ion akhoza kupirira zikwi zingapo m'zinthu.
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