Muaj kev vam meej hauv Li-S roj teeb thev naus laus zis: ntau dua 99%. Lub zog tom qab 200 cycles

Cov kws tshawb fawb ntawm University of Melbourne (Australia) tau tshaj tawm kev nce qib hauv lithium-sulfur (Li-S) roj teeb stabilization technology. Lawv muaj peev xwm tsim cov hlwb uas khaws cia ntau dua 99 feem pua ntawm lawv lub peev xwm tom qab 200 lub voj voog ntawm kev ua haujlwm thiab muab ntau zaus lub peev xwm ntawm lithium-ion hlwb rau tib qhov hnyav.

Li-S ntsiab - muaj teeb meem, muaj kev daws teeb meem

Lub tswv yim ntawm kev siv cov sulfur hauv cov hlwb tsis yog tshiab: Li-S roj teeb twb tau siv rau xyoo 2008 ntawm Zephyr-6, uas tau tsoo cov ntaub ntawv rau qhov tsis yog tsaws. Nws tuaj yeem nyob hauv huab cua yuav luag 3,5 hnub ua tsaug rau lub teeb yuag lithium-sulfur roj teeb uas siv lub cav thiab them lawv tus kheej los ntawm cov roj teeb photovoltaic (qhov chaw).

Txawm li cas los xij, Li-S hlwb muaj ib qho teeb meem loj: tiv taus txog li ob peb kaum ntawm kev ua haujlwmVim tias thaum them nyiaj, lub cathode ua los ntawm sulfur nce nws qhov ntim li ntawm 78 feem pua (!), uas yog 8 npaug ntau dua li ntawm graphite hauv lithium-ion hlwb. Qhov o ntawm cathode ua rau nws tawg thiab yaj cov sulfur hauv cov electrolyte.

Thiab qhov me me ntawm cathode, qhov me me ntawm lub peev xwm ntawm tag nrho cov cell - degradation tshwm sim tam sim ntawd.

> Lub tsheb fais fab yuav kav ntev npaum li cas? Muaj pes tsawg xyoo tus kws kho hluav taws xob lub roj teeb hloov? [Peb yuav teb]

Cov kws tshawb fawb hauv Melbourne tau txiav txim siab los muab cov sulfur molecules ua ke nrog cov polymer, tab sis muab qhov chaw me ntsis ntau dua li ua ntej. Ib feem ntawm cov ntaub ntawv kaw ntom ntom tau hloov pauv los ntawm cov txuas hluav taws xob hloov pauv tau yooj yim, uas ua rau nws muaj peev xwm ua kom muaj kev tiv thaiv ntau dua rau kev puas tsuaj nrog kev hloov pauv hauv ntim - cov txuas txuas txuas nrog cov ntsiab lus cathode zoo li roj hmab:

Polymer txuas txuas txuas cov qauv ntawm sulfur molecules (c) University of Melbourne

Cells nrog cov cathodes txhim kho zoo yog qhov zoo tshaj plaws. muaj peev xwm tuav tau 99 feem pua ntawm lawv cov peev txheej qub tom qab tshaj 200 lub voj voog (ib qhov chaw). Thiab lawv tau khaws cia qhov zoo tshaj plaws ntawm leej faj: lawv khaws cia txog li 5 npaug ntawm lub zog ib chav tsev ntau dua lithium-ion hlwb.

Minuses? Them thiab tso tawm tau tshwm sim ntawm lub zog ntawm 0,1 C (0,1 x muaj peev xwm), tom qab lwm 200 lub voj voog, txawm tias cov kev daws teeb meem zoo tshaj plaws tau nqis mus rau 80 feem pua ntawm lawv cov peev txheej qub... Tsis tas li ntawd, ntawm kev thauj khoom ntau dua (them / tso tawm ntawm 0,5 C), lub hlwb poob 20 feem pua ntawm lawv lub peev xwm tom qab ob peb lub kaum os, feem ntau tsuas yog tshaj 100 lub voj voog xwb.

Muaj kev vam meej hauv Li-S roj teeb thev naus laus zis: ntau dua 99%. lub zog tom qab 200 cycles