(I-Lithium metal anode) Isigaba sokusebenzelana sobuso se-electrolyte eqinile esuselwa ku-anion

I-Solid Electrolyte Interphase (SEI) isetshenziswa kabanzi ukuchaza isigaba esisha esakhiwe phakathi kwe-anode ne-electrolyte kumabhethri asebenzayo.Amandla aphezulu we-lithium (Li) amabhethri ensimbi athikamezwa kakhulu ukufakwa kwe-lithium ye-dendritic eqondiswa yi-SEI engafani.Nakuba inezinzuzo eziyingqayizivele ekuthuthukiseni ukufana kwe-lithium deposition, ekusetshenzisweni okusebenzayo, umphumela we-SEI ye-anion-derived ayilungile.Muva nje, iqembu locwaningo lika-Zhang Qiang laseNyuvesi yaseTsinghua lihlongoze ukusebenzisa ama-anion receptors ukuze kulungiswe ukwakheka kwe-electrolyte ukuze kwakhiwe i-SEI esuselwe kwi-anion ezinzile.I-tris(pentafluorophenyl)borane anion receptor (TPFPB) enama-athomu e-boron angenayo i-electron isebenzisana ne-bis(fluorosulfonimide) anion (FSI-) ukuze kuncishiswe ukuzinza kokunciphisa kwe-FSI-.Ngaphezu kwalokho, lapho kukhona i-TFPPB, uhlobo lwamaqoqo e-ion (AGG) lwe-FSI- ku-electrolyte lushintshile, futhi i-FSI- isebenzisana ne-Li+ eyengeziwe.Ngakho-ke, ukubola kwe-FSI- kukhuthazwa ukukhiqiza i-Li2S, futhi ukuzinza kwe-SEI etholakala ku-anion kuyathuthukiswa.

I-SEI yakhiwe imikhiqizo enciphisa ukubola kwe-electrolyte.Ukwakheka nokwakheka kwe-SEI kulawulwa ngokuyinhloko ukwakheka kwe-electrolyte, okungukuthi, ukusebenzisana okuncane phakathi kwe-solvent, anion, ne-Li+.Isakhiwo se-electrolyte sishintsha hhayi kuphela ngohlobo lwe-solvent ne-lithium usawoti, kodwa futhi nokugxila kukasawoti.Eminyakeni yamuva, i-high-concentration electrolyte (HCE) kanye ne-high-concentration electrolyte yendawo (LHCE) ibonise izinzuzo eziyingqayizivele ekuqiniseni i-lithium metal anode ngokwenza i-SEI ezinzile.Isilinganiso se-molar se-solvent kuya kusawoti we-lithium siphansi (ngaphansi kuka-2) futhi ama-anions angeniswa emgodleni wokuqala wokuxazulula we-Li +, okwenza ama-contact ion pairs (CIP) kanye nokuhlanganisa (AGG) ku-HCE noma i-LHCE.Ukwakhiwa kwe-SEI kulawulwa ama-anion ku-HCE kanye ne-LHCE, ebizwa nge-anion-derived SEI.Naphezu kokusebenza kwayo okukhangayo ekuzinziseni i-lithium metal anode, ama-SEI amanje atholakala ku-anion awanele ukuhlangabezana nezinselele zezimo ezingokoqobo.Ngakho-ke, kuyadingeka ukuthi kuqhutshekwe kuthuthukiswe ukuzinza nokufana kwe-SEI ephuma ku-anion ukuze kunqobe izinselele ngaphansi kwezimo zangempela.

Ama-anion asesimweni se-CIP kanye ne-AGG yizandulela eziyinhloko ze-SEI esuselwa ku-anion.Ngokuvamile, isakhiwo se-electrolyte sama-anion silawulwa ngokungaqondile yi-Li +, ngoba ukushaja okuhle kwama-molecule e-solvent kanye ne-diluent kwenziwa endaweni ebuthakathaka futhi ayikwazi ukuxhumana ngokuqondile nama-anions.Ngakho-ke, amasu amasha okulawula ukwakheka kwe-anionic electrolyte ngokusebenzisana ngokuqondile nama-anion alindelwe kakhulu.