Inkomoko: umuyobozi mushya w'ingufu, by
Abstract: Kugeza ubu, umunyu wa lithium muri batiri ya lithium-ion yubucuruzi ya electrolyte ahanini ni LiPF6 na LiPF6 batanze electrolyte imikorere myiza yamashanyarazi, ariko LiPF6 ifite ubushyuhe buke nubushyuhe, kandi yunvikana cyane kumazi.
Kugeza ubu, imyunyu ya lithium mu bucuruzi bwa litiro-ion ya batiri electrolyte ni LiPF6 na LiPF6 yahaye electrolyte imikorere myiza y’amashanyarazi.Nyamara, LiPF6 ifite ubushyuhe buke nubushyuhe, kandi yunvikana cyane kumazi.Mubikorwa bya H2O nkeya, ibintu bya aside nka HF bizabora, hanyuma ibintu byiza bizangirika, kandi ibyuma byinzibacyuho bizashonga, kandi hejuru ya electrode mbi izimurwa kugirango isenye firime ya SEI , Ibisubizo byerekana ko firime ya SEI ikomeje kwiyongera, biganisha ku kugabanuka guhoraho kwubushobozi bwa bateri ya lithium-ion.
Mu rwego rwo gutsinda ibyo bibazo, abantu bizeye ko umunyu wa lithium ya imide hamwe na H2O ihamye kandi itajegajega neza hamwe nubushyuhe bwimiti, nkumunyu wa lithium nka LiTFSI, lifsi na liftfsi, bigarukira kubintu biterwa na anion yumunyu wa lithium. nka LiTFSI ntishobora gukemurwa kugirango yangirwe na Al foil, nibindi, umunyu wa lithium LiTFSI ntabwo wakoreshejwe mubikorwa.Vuba aha, VARVARA sharova yo muri laboratoire ya HIU yo mu Budage yabonye uburyo bushya bwo gukoresha umunyu wa imide lithium nkinyongera ya electrolyte.
Ubushobozi buke bwa grafite ya electrode itari nziza muri bateri ya Li-ion bizatuma habaho kwangirika kwa electrolyte hejuru yacyo, bigakora passivation layer, bita firime ya SEI.Filime ya SEI irashobora kubuza electrolyte kubora kubutaka bubi, bityo rero firime ya SEI igira uruhare runini mukuzunguruka kwizuba rya bateri ya lithium-ion.Nubwo umunyu wa lithium nka LiTFSI udashobora gukoreshwa nka solute ya electrolyte yubucuruzi mugihe gito, yakoreshejwe nkinyongera kandi yageze kubisubizo byiza cyane.Ubushakashatsi bwa VARVARA sharova bwerekanye ko kongeramo 2wt% LiTFSI muri electrolyte bishobora kuzamura neza imikorere yizunguruka ya batiri ya lifepo4 / grafite: inzinguzingo 600 kuri 20 ℃ kandi kugabanuka kwubushobozi ntibiri munsi ya 2%.Mu itsinda rishinzwe kugenzura, electrolyte hamwe na 2wt% VC yongeyeho.Mubihe bimwe, kugabanuka kwubushobozi bwa bateri bigera kuri 20%.
Kugirango hamenyekane ingaruka zinyongeramusaruro zitandukanye kumikorere ya bateri ya lithium-ion, itsinda ryambaye ubusa lp30 (EC: DMC = 1: 1) nta nyongeramusaruro hamwe nitsinda ryubushakashatsi hamwe na VC, LiTFSI, lifsi na liftfsi byateguwe na varvarvara sharova bikurikiranye.Imikorere ya electrolytite yasuzumwe na buto igice cyakagari na selile yuzuye.
Igishushanyo kiri hejuru cyerekana umurongo wa voltammetric ya electrolytite yitsinda rishinzwe kugenzura ubusa hamwe nitsinda ryubushakashatsi.Mugihe cyo kugabanya, twabonye ko impinga igaragara yagaragaye muri electrolyte yitsinda ryambaye ubusa nka 0,65v, bihuye no kugabanuka kwangirika kwa EC.Isenyuka ryubu ryitsinda ryitsinda ryubushakashatsi hamwe ninyongera ya VC ryimukiye mubushobozi buhanitse, byatewe ahanini nuko voltage yo kubora ya VC yiyongereye yari hejuru ya EC, Kubwibyo, kubora byabaye mbere, birinda EC.Nyamara, imirongo ya voltammetric ya electrolyte yongewemo na LiTFSI, lifsi na littfsi ntago yari itandukanye cyane niyitsinda ryambaye ubusa, ryerekanaga ko inyongeramusaruro idashobora kugabanya kwangirika kwa EC solvent.
Igishushanyo kiri hejuru cyerekana imikorere ya electrochemicique ya grafite anode muri electrolytite zitandukanye.Uhereye ku mikorere yambere yishyurwa no gusohora, imikorere ya coulomb yitsinda ryambaye ubusa ni 93.3%, imikorere yambere ya electrolytite hamwe na LiTFSI, lifsi na liftfsi ni 93.3%, 93.6% na 93.8%.Nyamara, imikorere yambere ya electrolytike hamwe ninyongera ya VC ni 91.5% gusa, ibyo bikaba biterwa cyane cyane nuko mugihe cya mbere cya lithium intercalation ya grafite, VC ibora hejuru ya grafite anode kandi ikoresha Li nyinshi.
Ibigize firime ya SEI bizagira uruhare runini kumikorere ya ionic, hanyuma bigire ingaruka kumikorere ya bateri ya Li ion.Mu kizamini cyo gukora igipimo, usanga electrolyte ifite ubuzima bwa lifsi na liftfsi ifite ubushobozi buke buke ugereranije nizindi electrolytike mu gusohora kwinshi.Mu kizamini cya C / 2, imikorere ya cycle ya electrolytite zose hamwe ninyongera ya imide irahagaze neza, mugihe ubushobozi bwa electrolytite hamwe ninyongera za VC buragabanuka.
Kugirango hamenyekane ituze rya electrolyte mugihe cyigihe kirekire cya batiri ya lithium-ion, VARVARA sharova yateguye kandi LiFePO4 / grafite selile yuzuye hamwe na selile, hanyuma isuzuma imikorere yizunguruka ya electrolyte hamwe ninyongera zitandukanye kuri 20 ℃ na 40 ℃.Ibisubizo by'isuzuma bigaragara mu mbonerahamwe ikurikira.Birashobora kugaragara kumeza ko imikorere ya electrolyte hamwe ninyongera ya LiTFSI iri hejuru cyane ugereranije niyongerewe na VC kunshuro yambere, kandi imikorere yamagare kuri 20 even irarenze.Igipimo cyo kugumana ubushobozi bwa electrolyte hamwe ninyongera ya LiTFSI ni 98.1% nyuma yinzinguzingo 600, mugihe igipimo cyo kugumana ubushobozi bwa electrolyte hamwe ninyongera ya VC ni 79,6% gusa.Nyamara, iyi nyungu irazimira iyo electrolyte izunguruka kuri 40 and, kandi electrolytite zose zifite imikorere yamagare.
Duhereye ku isesengura ryavuzwe haruguru, ntabwo bigoye kubona ko imikorere yizunguruka ya batiri ya lithium-ion ishobora kunozwa cyane mugihe umunyu wa lithium imide ukoreshwa nkinyongera ya electrolyte.Mu rwego rwo kwiga uburyo bwibikorwa byinyongera nka LiTFSI muri bateri ya lithium-ion, VARVARA sharova yasesenguye imiterere ya firime ya SEI ikozwe hejuru ya grafite anode muri electrolytite zitandukanye na XPS.Igishushanyo gikurikira cyerekana ibisubizo bya XPS isesengura rya firime ya SEI yakozwe hejuru ya grafite anode nyuma yambere na 50.Birashobora kugaragara ko ibiri muri LIF muri firime ya SEI byakozwe muri electrolyte hamwe ninyongera ya LiTFSI iri hejuru cyane ugereranije no muri electrolyte hamwe ninyongera ya VC.Ubundi isesengura ryinshi ryimiterere ya firime ya SEI yerekana ko gahunda yibintu bya LIF muri firime ya SEI ari lifsi> liftfsi> LiTFSI> VC> itsinda ryambaye ubusa nyuma yicyiciro cya mbere, ariko film ya SEI ntabwo ihinduka nyuma yo kwishyurwa bwa mbere.Nyuma yinzinguzingo 50, LIF yibiri muri firime ya SEI muri lifsi na liftfsi electrolyte yagabanutseho 12% na 43%, mugihe LIF yibigize electrolyte yongeyeho na LiTFSI yiyongereyeho 9%.
Mubisanzwe, twibwira ko imiterere ya membrane ya SEI igabanijwemo ibice bibiri: imbere imbere ya organorganic layer na organique yo hanze.Igice kidasanzwe kigizwe ahanini na LIF, Li2CO3 nibindi bikoresho bidafite ingufu, bifite imikorere myiza yamashanyarazi nubushobozi buke bwa ionic.Igice kama cyo hanze kigizwe ahanini na parike ya electrolyte yangirika nibicuruzwa bya polymerizasiya, nka roco2li, PEO nibindi, bidafite uburinzi bukomeye kuri electrolyte, Kubwibyo, turizera ko membrane ya SEI irimo ibintu byinshi bidafite umubiri.Inyongeramusaruro zirashobora kuzana ibintu byinshi bidasanzwe bya LIF mubice bya SEI, bigatuma imiterere ya membrane ya SEI itajegajega, irashobora gukumira neza kwangirika kwa electrolyte mugikorwa cyizunguruka ya bateri, kugabanya ikoreshwa rya Li, no kuzamura cyane imikorere yizunguruka ya bateri.
Ninyongera ya electrolyte, cyane cyane inyongera ya LiTFSI, imide ya lithium imide irashobora kunoza cyane imikorere yizunguruka ya bateri.Ibi ahanini biterwa nuko firime ya SEI yakozwe hejuru ya grafite anode ifite firime nyinshi za LIF, yoroheje kandi ihamye ya SEI, igabanya kwangirika kwa electrolyte kandi ikagabanya kurwanya interineti.Ariko, uhereye kumibare yubushakashatsi iriho, inyongera ya LiTFSI irakwiriye gukoreshwa mubushyuhe bwicyumba.Kuri 40 ℃, inyongera ya LiTFSI nta nyungu igaragara kurenza VC.
Igihe cyo kohereza: Apr-15-2021