Ngomhla wama-21 ka-Agasti, uProf MA Cheng ovela kwiYunivesithi yeSayensi kunye neTeknoloji yaseChina (i-USTC) kunye namaqabane akhe bacebise isicwangciso esisebenzayo sokujongana nomcimbi woqhagamshelwano we-electrode-electrolyte othintela ukuphuhliswa kwesizukulwana esilandelayo seebhetri zeLi eziqinileyo. I-electrode ehlanganisiweyo eqinileyo eyenziwe ngale ndlela ibonise amandla akhethekileyo kunye nomgangatho wokusebenza.
Ukutshintsha i-electrolyte yolwelo oluphilayo kwiibhetri zeLi-ion zesiqhelo ngee-electrolyte eziqinileyo kunokunciphisa kakhulu imiba yokhuseleko, kwaye kunokwaphula “isilingi yeglasi” ukuze kuphuculwe ukuxinana kwamandla. Nangona kunjalo, izinto eziqhelekileyo ze-electrode nazo ziqinileyo. Ekubeni uqhagamshelwano phakathi kwezinto ezimbini eziqinileyo luphantse lungenzeki ukuba lusondelelene njengalo luphakathi kokuqinileyo kunye nolwelo, okwangoku iibhetri ezisekwe kwi-electrolytes eqinileyo ngokuqhelekileyo zibonisa uqhagamshelwano olubi lwe-electrolyte kunye nokusebenza okunganelisiyo kweseli epheleleyo.
"I-electrode-electrolyte umba woqhagamshelwano lweebhetri eziqinileyo zifana neyona nto imfutshane yombhobho weplanga," watsho uProf. MA Cheng wase-USTC, umbhali okhokelayo wokufunda. "Enyanisweni, kule minyaka abaphandi sele bephuhlise uninzi lwee-electrode ezibalaseleyo kunye nee-electrolyte eziqinileyo, kodwa unxibelelwano olubi phakathi kwabo lusenokunciphisa ukusebenza kakuhle kothutho lwe-Li-ion."
Ngethamsanqa, isicwangciso se-MA sinokoyisa lo mngeni mkhulu. Uphononongo lwaqala ngovavanyo lwe-athomu-nge-athomu yesigaba sokungcola kwiprototype, i-electrolyte eqinileyo ye-perovskite. Nangona i-crystal structure yahluke kakhulu phakathi kokungcola kunye ne-electrolyte eqinile, zabonwa ukuba zenze i-epitaxial interfaces. Emva koluhlu lohlalutyo olunzulu lwesakhiwo kunye neekhemikhali, abaphandi bafumanisa ukuba isigaba sokungcola si-isostructural kunye ne-high-capacity Li-rich layered electrode. Oko kukuthi, i-electrolyte eqinileyo yeprototype inokugqama kwi "template" eyenziwe yisakhelo se-athomu ye-electrode ephezulu yokusebenza, okukhokelela kunxibelelwano olusondeleyo lwe-atom.
“Kuyothusa ngokwenene oku,” watsho umbhali wokuqala u-LI Fuzhen, ngoku ongumfundi onesidanga sase-USTC. “Ubukho bokungcola kwizinto eziphathekayo buyinto exhaphake kakhulu, kangangokuba ixesha elininzi azisayi kuhoywa.” Noko ke, emva kokuzijongisisa, siye safumanisa le ndlela yokuziphatha ye-epitaxial eyayingalindelekanga, yaye yaphefumlela ngokuthe ngqo isicwangciso sethu sokuphucula unxibelelwano oluqinileyo.”
Xa kuthelekiswa nendlela eqhelekileyo eyamkelwayo yokucinezela ukubanda, iqhinga elicetywayo ngabaphandi banokuqonda unxibelelwano olucokisekileyo, olungenamthungo phakathi kwee-electrolyte eziqinileyo kunye nee-electrode kwisikali seathom, njengoko kubonisiwe kumfanekiso we-atomic-resolution electron microscopy. (Ibonelelwe liqela le-MA.)
Ukuthatha inzuzo yento ebonwayo, abaphandi bagxininisa ngamabomu i-amorphous powder kunye nokwakheka okufanayo kunye ne-electrolyte eqinileyo ye-perovskite phezu kwendawo ye-Li-rich rich layered compound, kwaye baqonda ngempumelelo uqhagamshelwano olucokisekileyo, olungenamthungo phakathi kwezi zinto zimbini eziqinileyo kwi-electrode edibeneyo. Ngomba woqhagamshelwano we-electrode-electrolyte ujongiwe, i-electrode eqinileyo edibeneyo ehlanganisiweyo yazisa amandla okulinganisa anokuthelekiswa nalawo avela kwi-electrode edibeneyo edibeneyo. Okubaluleke ngakumbi, abaphandi baye bafumanisa ukuba olu hlobo lwe-epitaxial-solid-solid contact inokunyamezela ukungahambi kakuhle kwe-lattice enkulu, kwaye ngoko ke isicwangciso esicetywayo sinokusebenza kwezinye ezininzi ii-electrolyte eziqinileyo ze-perovskite kunye nee-electrode ezicwangcisiweyo.
“Lo msebenzi walatha umkhombandlela ofanele ukulandelwa,” utshilo uM. “Ukusebenzisa umgaqo ochazwe apha kwezinye izinto ezibalulekileyo kunokukhokelela ekubeni iiseli zisebenze kakuhle ngakumbi nakwinzululwazi ebangel’ umdla ngakumbi.
Abaphandi banenjongo yokuqhubeka nokuhlola kwabo kweli cala, kwaye basebenzise isicwangciso esicetywayo kwezinye ii-cathodes eziphezulu, eziphezulu.
Uphononongo lwapapashwa kwi-Matter, ijenali ye-flagship ye-Cell Press, enesihloko esithi "Uqhagamshelwano olusondeleyo lwe-Atomically phakathi kwe-Electrolytes eSolid kunye ne-Electrodes ye-Li Battery". Umbhali wokuqala ngu-LI Fuzhen, umfundi ophumelele i-USTC. Amaqabane kaProf MA Cheng aquka uProf NAN Ce-Wen ovela kwiYunivesithi yaseTsinghua kunye noGqr ZHOU Lin ovela kwiLebhu yase-Ames.
(Isikolo seKhemistri kunye neSayensi yezinto eziphathekayo)
Ikhonkco lephepha: https://www.cell.com/matter/fulltext/S2590-2385(19)30029-3
Ixesha lokuposa: Jun-03-2019