Xigasho: hogaamiyaha tamarta cusub, by
Soo koobid: wakhtigan xaadirka ah, cusbada lithium-ka ee ku jirta batariyada lithium-ion-ka ganacsiga ee electrolyte-ka ah waxay u badan yihiin LiPF6 iyo LiPF6 waxay siiyeen electrolyte-ka wax qabad koronto-kimikaad ah oo aad u wanaagsan, laakiin LiPF6 waxay leedahay kuleyl iyo xasilooni kiimikaad oo liidata, waxayna aad ugu nugul tahay biyaha.
Waqtigan xaadirka ah, milixyada lithium-ka ee ku jira batteriga lithium-ion-ganacsiyeedka elektrolytka inta badan waa LiPF6 iyo LiPF6 waxay siiyeen korantada wax qabad kiimikaad heer sare ah.Si kastaba ha ahaatee, LiPF6 waxay leedahay kuleyl iyo xasilooni kiimikaad oo liidata, waxayna aad ugu nugul tahay biyaha.Iyadoo la raacayo ficilka qadar yar oo H2O ah, walxaha acid sida HF waa la jajabin doonaa, ka dibna walxaha togan waa la daxaloobayaa, iyo walxaha birta ee kala-guurka ah ayaa la kala diri doonaa, dusha sare ee electrode taban ayaa loo guuri doonaa si loo burburiyo filimka SEI , Natiijooyinku waxay muujinayaan in filimka SEI uu sii wado koritaanka, taas oo horseedaysa hoos u dhaca joogtada ah ee awoodda baytariyada lithium-ion.
Si looga gudbo dhibaatooyinkaas, dadku waxay rajaynayeen in milixda lithium-ka ee imide ee leh H2O xasilloon iyo kuleyl iyo xasillooni ka wanaagsan kiimikaad, sida cusbada lithium sida LiTFSI, lifsi iyo liftfsi, ay xaddidan yihiin arrimo kharash ah iyo anions of lithium cusbada. sida LiTFSI looma xallin karo daxalka Al-foil, iwm., LiTFSI lithium cusbo ah laguma dabaqin ficil ahaan.Dhowaan, VARVARA sharova ee shaybaadhka HIU ee Jarmalka ayaa helay hab cusub oo loogu isticmaalo cusbada lithium imide sida kuwa lagu daro electrolyte.
Awoodda hoose ee graphite negative electrode ee batteriga Li-ion waxay u horseedi doontaa burburka korantada ee dusha sare, samaynta lakabka passivation, kaas oo loo yaqaan filimka SEI.Filimka SEI wuxuu ka hortagi karaa elektrolytka inuu burburo dusha xun, sidaas darteed xasilloonida filimka SEI wuxuu saameyn muhiim ah ku leeyahay xasilloonida wareegga baytariyada lithium-ion.In kasta oo cusbada lithium-ka sida LiTFSI aan loo isticmaali karin xalalka korantada ganacsiga in muddo ah, waxa loo isticmaalay wax lagu daro oo waxa ay gaadhay natiijooyin aad u wanaagsan.Tijaabada VARVARA sharova waxay ogaatay in ku darista 2wt% LiTFSI ee elektrolytka ay si wax ku ool ah u wanaajin karto waxqabadka wareegga nolosha batari 4/graphite: 600 wareegyada 20 ℃ iyo hoos u dhaca awoodda ayaa ka yar 2%.Kooxda kantaroolka, korantada leh 2wt% VC wax lagu daro ayaa lagu daraa.Isla shuruudo la mid ah, hoos u dhaca awoodda batteriga ayaa gaaraya ilaa 20%.
Si loo xaqiijiyo saamaynta wax-qabadyada kala duwan ee waxqabadka baytariyada lithium-ion, kooxda bannaan ee lp30 (EC: DMC = 1: 1) oo aan lahayn wax lagu daro iyo kooxda tijaabada ah ee leh VC, LiTFSI, lifsi iyo liftfsi waxaa diyaariyey varvarvara sharova. siday u kala horreeyaan.Waxqabadka electrolytes-kan waxaa lagu qiimeeyay badhanka unugga badhkii iyo unug buuxa.
Jaantuska kore wuxuu muujinayaa qalooca voltammetric ee korantada ee kooxda xakamaynta bannaan iyo kooxda tijaabada ah.Intii lagu jiray habka dhimista, waxaan ogaanay in heerka ugu sarreeya ee hadda muuqda uu ka soo muuqday elektrolytka kooxda madhan qiyaastii 0.65v, oo u dhiganta hoos u dhigista kala-goynta dareeraha EC.Burburka ugu sarreeya ee kooxda tijaabada ah ee VC-da ayaa u wareegay awoodda sare, taas oo inta badan ahayd sababtoo ah korantada kala-goynta ee VC wax-qabadku waxay ka sarreeyeen kan EC, Sidaa darteed, kala-goynta ayaa dhacay markii hore, taas oo ilaalisay EC.Si kastaba ha ahaatee, qalooca voltammetric ee elektrolytka ee lagu daray LiTFSI, lifsi iyo littfsi darooyinku aad ugama duwana kuwa kooxda madhan, taas oo muujisay in waxyaalaha lagu daro imide aanay yarayn karin burburka dareeraha EC.
Jaantuska kore wuxuu muujinayaa waxqabadka korantada ee graphite anode ee elektrolytka kala duwan.Laga soo bilaabo waxtarka dallaca koowaad iyo sii daynta, waxtarka coulomb ee kooxda bannaan waa 93.3%, waxtarka ugu horreeya ee elektrolytka leh LiTFSI, lifsi iyo liftfsi waa 93.3%, 93.6% iyo 93.8%, siday u kala horreeyaan.Si kastaba ha ahaatee, waxtarka ugu horreeya ee electrolytes leh VC daro waa kaliya 91.5%, taas oo inta badan ah sababtoo ah inta lagu jiro isdhexgalka ugu horreeya ee lithium ee graphite, VC waxay ku jajabisaa dusha sare ee graphite anode waxayna cuntaa Li badan.
Halabuurka filimka SEI wuxuu saameyn weyn ku yeelan doonaa dhaqdhaqaaqa ionic, ka dibna wuxuu saameynayaa waxqabadka heerka batteriga Li ion.Tijaabada waxqabadka heerka, waxaa la ogaaday in korantada leh lifsi iyo liftfsi lagu daro ay awood waxyar ka hooseeyso marka loo eego kuwa kale ee ku jira dareeraha hadda jira.Imtixaanka wareegga C / 2, waxqabadka wareegga dhammaan elektrolytka ee leh waxyaabaha lagu daro imide waa mid aad u deggan, halka awoodda korantada ee leh VC ay hoos u dhacdo.
Si loo qiimeeyo xasilloonida elektrolytka ee wareegga muddada-dheer ee baytariga lithium-ion, VARVARA sharova waxay sidoo kale diyaarisay LiFePO4 / graphite unug buuxa oo leh unug badhanka, waxayna qiimeeyeen waxqabadka wareegga elektrolytka ee lagu daro kala duwan 20 ℃ iyo 40 ℃.Natiijooyinka qiimaynta waxa lagu muujiyay shaxda hoose.Waxaa laga arki karaa miiska in waxtarka elektrolytka leh wax-ku-darka LiTFSI uu aad uga sarreeyo kan lagu daro VC markii ugu horreysay, iyo waxqabadka baaskiilka ee 20 ℃ uu xitaa aad u culus yahay.Heerka haynta awoodda korantada ee leh wax-ku-darka LiTFSI waa 98.1% ka dib 600 wareegyo, halka heerka haynta awoodda korantada leh wax-ku-darka VC ay tahay kaliya 79.6%.Si kastaba ha ahaatee, faa'iidadani waxay baaba'aysaa marka elektrolytka lagu wado baaskiil 40 ℃, iyo dhammaan electrolytes waxay leeyihiin waxqabadka baaskiilka oo isku mid ah.
Falanqaynta kor ku xusan, ma adka in la arko in waxqabadka wareegga ee baytari lithium-ion si weyn loo wanaajin karo marka lithium imide cusbo loo isticmaalo wax lagu daro korantada.Si loo barto habka wax-qabadka ee waxyaabaha lagu daro sida LiTFSI ee baytariyada lithium-ion, VARVARA sharova waxay falanqeysay halabuurka filimka SEI ee lagu sameeyay dusha sare ee graphite anode ee electrolytes kala duwan ee XPS.Jaantuska soo socdaa wuxuu muujinayaa natiijooyinka falanqaynta XPS ee filimka SEI ee laga sameeyay dusha sare ee graphite anode ka dib wareegyada koowaad iyo 50aad.Waxaa la arki karaa in nuxurka LIF ee filimka SEI ee lagu sameeyay elektrolytka oo leh wax lagu daro LiTFSI uu aad uga sarreeyo kan ku jira korantada ee leh VC daro.Falanqaynta tirada dheeraadka ah ee ka kooban filimka SEI waxay muujinaysaa in nidaamka LIF ee filimka SEI uu yahay lifsi> liftfsi> LiTFSI> VC> koox madhan ka dib wareegga koowaad, laakiin filimka SEI ma aha mid aan isbeddelin ka dib markii ugu horeysay.Wareegyada 50 ka dib, nuxurka LIF ee filimka SEI ee lifsi iyo liftfsi electrolyte ayaa hoos u dhacay 12% iyo 43%, siday u kala horreeyaan, halka LIF content ee elektrolytka lagu daray LiTFSI uu kordhay 9%.
Guud ahaan, waxaan u maleyneynaa in qaabka xuubka SEI uu u qaybsan yahay laba lakab: lakabka gudaha ee gudaha iyo lakabka dabiiciga ah ee dibadda.Lakabka inorganic wuxuu inta badan ka kooban yahay LIF, Li2CO3 iyo qaybo kale oo aan organic ahayn, kuwaas oo leh waxqabad koronto kiimikaad oo wanaagsan iyo kororka ionic sare.Lakabka dabiiciga ah ee dibadda wuxuu inta badan ka kooban yahay kala-soocidda elektrolytka daloolka leh iyo alaabada polymerization, sida roco2li, PEO iyo wixii la mid ah, taas oo aan lahayn difaac adag oo loogu talagalay elektrolytka, Sidaa darteed, waxaan rajeyneynaa in xuubka SEI uu ka kooban yahay qaybo badan oo aan dabiici ahayn.Waxyaalaha Imide waxay keeni kartaa qaybo badan oo LIF ah oo aan organic ahayn xuubka SEI, taas oo ka dhigaysa qaab-dhismeedka xuubka SEI mid xasiloon, wuxuu si fiican uga hortagi karaa kala-soocidda elektrolytka ee habka wareegga batteriga, wuxuu yareeyaa isticmaalka Li, wuxuuna si weyn u wanaajiyaa waxqabadka wareegga batteriga.
Sida kuwa lagu daro korantada, gaar ahaan kuwa lagu daro LiTFSI, imide lithium cusbada waxay si weyn u wanaajin kartaa waxqabadka wareegga batteriga.Tani waxay badanaa sabab u tahay xaqiiqda ah in filimka SEI ee lagu sameeyay dusha sare ee graphite anode uu leeyahay LIF badan, khafiif ah oo xasilan SEI, kaas oo yareynaya kala-goynta elektrolytka waxayna yaraynaysaa iska caabbinta interface.Si kastaba ha ahaatee, xogta tijaabada ah ee hadda jirta, wax lagu daro LiTFSI ayaa aad ugu habboon isticmaalka heerkulka qolka.Marka la joogo 40 ℃, wax lagu daro LiTFSI ma laha faa'iido muuqata marka loo eego ku darsiga VC.
Waqtiga boostada: Abriil-15-2021