Kukhona inqubekelaphambili kubuchwepheshe bebhethri ye-Li-S: ngaphezu kwe-99%. amandla ngemuva kwemijikelezo engama-200

Ososayensi baseNyuvesi yaseMelbourne (e-Australia) bamemezele inqubekelaphambili kubuchwepheshe bokuqinisa ibhethri i-lithium-sulfur (Li-S). Bakwazi ukudala amaseli agcine ngaphezu kwamaphesenti angama-99 omthamo wawo ngemuva kwemijikelezo engama-200 yokusebenza futhi anikeza izikhathi eziningi umthamo wamaseli e-lithium-ion ngesisindo esifanayo.

Izakhi ze-Li-S - kunezinkinga, kunezixazululo

Umqondo wokusebenzisa isulfure kumaseli awumusha: Amabhethri e-Li-S asevele asetshenziswa ngo-2008 ku-Zephyr-6, eyaphula irekhodi lobubanzi obungahlali. Ingase ihlale emoyeni cishe izinsuku ezingu-3,5 ngenxa yamabhethri e-lithium-sulphur angasindi anika injini amandla futhi azishaje ngokwawo ngamabhethri e-photovoltaic (umthombo).

Kodwa-ke, amaseli e-Li-S ane-drawback eyodwa enkulu: ukumelana kuze kufike emashumini ambalwa emijikelezo yokusebenzaNgoba lapho ishaja, i-cathode eyenziwe ngesulfure inyusa umthamo wayo ngamaphesenti angaba ngu-78 (!), Okuphindwe izikhathi ezingu-8 kune-graphite kumaseli e-lithium-ion. Ukuvuvukala kwe-cathode kubangela ukuba ibhidlike futhi ichitheke isibabule ku-electrolyte.

Futhi usayizi omncane we-cathode, umthamo omncane weseli lonke - ukuwohloka kwenzeka ngokushesha.

> Imoto kagesi kufanele ihlale isikhathi esingakanani? Ibhethri likagesi lishintshwa iminyaka emingaki? [SIZOPHENDULA]

Ososayensi baseMelbourne banquma ukunamathisela ama-molecule esulfure nge-polymer, kodwa bawanikeza isikhala esincane kunangaphambili. Ezinye zezibopho eziqinile zathathelwa indawo amabhuloho e-polymer aguquguqukayo, okwenza kwaba nokwenzeka ukufeza ukumelana okuphezulu ekubhujisweni lapho ivolumu ishintsha - amabhuloho ahlanganisa izakhi ze-cathode ndawonye njengerabha:

Amabhuloho epolymer axhumanisa izakhiwo zamamolekyuli esulfure (c) Inyuvesi yaseMelbourne

Amaseli anama-cathode athuthukisiwe angcono kakhulu. bakwazile ukugcina amaphesenti angama-99 omthamo wabo wangempela ngemuva kwemijikelezo yokushaja engaphezu kuka-200 (umthombo). Futhi baye bagcina inzuzo enkulu yesulfure: bagcina amandla aphindwe izikhathi ezi-5 ngomthamo weyunithi ngayinye kunamaseli e-lithium-ion.

Amaminithi? Ukushaja nokushajwa kwenzeke ngamandla angu-0,1 C (0,1 x umthamo), ngemva kweminye imijikelezo engu-200, ngisho nezixazululo ezingcono kakhulu ziye zehla zafinyelela kumaphesenti angu-80 omthamo wazo wokuqala... Ukwengeza, emithwalweni ephezulu (ukushaja / ukukhulula ku-0,5 C), amaseli alahlekelwa amaphesenti angama-20 womthamo wawo ngemuva kweshumi nambili, kuze kube umkhawulo wemijikelezo yokushaja engaphezudlwana kwe-100.

Kukhona inqubekelaphambili kubuchwepheshe bebhethri ye-Li-S: ngaphezu kwama-99%. amandla ngemva kwemijikelezo engu-200