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Abstract: pari zvino, iyo lithium munyu mukutengesa lithium-ion bhatiri electrolyte inonyanya LiPF6 uye LiPF6 yakapa electrolyte yakanakisa electrochemical performance, asi LiPF6 ine urombo hwekupisa uye kugadzikana kwemakemikari, uye inonzwa zvakanyanya kumvura.
Parizvino, iyo lithium munyu mune yekutengesa lithium-ion bhatiri electrolyte inonyanya kuve LiPF6 uye LiPF6 yakapa iyo electrolyte yakanakisa electrochemical kuita.Nekudaro, LiPF6 ine hurombo hwekupisa uye kugadzikana kwemakemikari, uye inonzwa zvakanyanya kumvura.Pasi pekuita kwehuwandu hushoma hweH2O, zvinhu zveasidhi zvakadai seHF zvichave zvakaora, uye ipapo zvinhu zvakanaka zvichange zvichisvibiswa, uye zvinhu zvesimbi zvinoshanduka zvichanyungudutswa, uye pamusoro pe electrode yakaipa ichatamiswa kuti iparadze SEI firimu. , Zvigumisiro zvinoratidza kuti firimu yeSEI inoramba ichikura, iyo inotungamirira pakuderera kunoramba kuripo kwesimba re lithiamu-ion mabhatiri.
Kuti vakunde matambudziko aya, vanhu vakatarisira kuti iyo lithium salt yeimide ine H2O yakagadzikana uye zvirinani kupisa uye kugadzikana kwekemikari, senge lithium munyu seLiTFSI, lifsi uye liftfsi, inoganhurwa nemitengo yezvinhu uye anions yelithium munyu. seLiTFSI haigone kugadziriswa nekuda kwekuora kweAl foil, nezvimwewo, LiTFSI lithium munyu haina kuiswa mukuita.Munguva pfupi yapfuura, VARVARA sharova yeGerman HIU laboratory yakawana nzira itsva yekushandisa imide lithium salt se electrolyte additives.
Iyo yakaderera kugona kwe graphite negative electrode muLi-ion bhatiri inotungamira mukuora kwe electrolyte pamusoro payo, kuumba passivation layer, iyo inonzi SEI firimu.SEI firimu rinogona kudzivirira electrolyte kubva pakuora panzvimbo isina kunaka, saka kugadzikana kweSEI firimu kune zvakakosha pakutenderera kugadzikana kwemabhatiri e-lithium-ion.Kunyangwe lithium munyu seLiTFSI isingakwanise kushandiswa sesolute yekutengesa electrolyte kwechinguva, yakashandiswa sekuwedzera uye yakawana mhedzisiro yakanaka.VARVARA sharova experiment yakawana kuti kuwedzera 2wt% LiTFSI muelectrolyte kunogona kuvandudza zvinobudirira kushanda kwelifepo4/graphite bhatiri: 600 cycles pa20 ℃ uye kusasimba kuri pasi pe2%.Muboka rekutonga, iyo electrolyte ine 2wt% VC yekuwedzera inowedzerwa.Pasi pemamiriro akafanana, kuderera kwesimba rebhatiri kunosvika anenge 20%.
Kuti uone mhedzisiro yezvinowedzera zvakasiyana pakushanda kwemabhatiri e-lithium-ion, boka risina chinhu lp30 (EC: DMC = 1: 1) risina kuwedzera uye boka rekuedza rine VC, LiTFSI, lifsi uye liftfsi rakagadzirirwa nevarvarvara sharova. zvichiteerana.Kuita kwema electrolyte aya kwakaongororwa nebhatani hafu sero uye sero rakazara.
Mufananidzo uri pamusoro unoratidza ma voltammetric curves e electrolytes ye blank control group neboka rekuedza.Munguva yekuderedza, takaona kuti peak iri pachena yazvino yakaonekwa mu electrolyte yeboka risina chinhu panenge 0.65v, inoenderana nekuderera kwekuparara kweEC solvent.The decomposition current peak of the experimental group with VC additive shifted to high potential, which was especially because the decomposition voltage of VC additive was high than that of EC, Naizvozvo, kuparara kwakaitika pakutanga, iyo yakadzivirira EC.Zvisinei, ma voltammetric curves e electrolyte akawedzerwa neLiTFSI, lifsi uye littfsi additives akanga asina kunyanya kusiyana neaya eboka risina chinhu, izvo zvakaratidza kuti imide additives haigoni kuderedza kuparara kweEC solvent.
Nhamba iri pamusoro inoratidza kushanda kwe electrochemical ye graphite anode muma electrolyte akasiyana.Kubva pakubudirira kwekutanga kuchaja uye kuburitsa, kugona kwecoulomb kweboka risina chinhu i93.3%, kushanda kwekutanga kwema electrolytes neLiTFSI, lifsi uye liftfsi i93.3%, 93.6% uye 93.8% zvichiteerana.Zvisinei, kushanda kwekutanga kwe electrolytes neVC additive inongova 91.5%, iyo inonyanya nokuti panguva yekutanga lithium intercalation yegraphite, VC inoora pamusoro pe graphite anode uye inoshandisa Li yakawanda.
Iko kuumbwa kweSEI firimu kuchave nekupesvedzera kukuru pane ionic conductivity, uye zvobva zvakanganisa chiyero chekuita kweLi ion bhatiri.Pakuyedzwa kwechiyero chekuita, zvinoonekwa kuti electrolyte ine lifsi uye liftfsi additives ine yakaderera zvishoma pane mamwe maelectrolyte mukubuda kwakakwira ikozvino.Muyedzo yeC/2 cycle bvunzo, kutenderera kuita kwema electrolyte ese ane imide additives kwakagadzikana zvakanyanya, ukuwo kugona kwema electrolyte ane VC additives kunoderera.
Kuti tiongorore kugadzikana kwe electrolyte mukufamba kwenguva refu kwe lithium-ion bhatiri, VARVARA sharova yakagadzirawo LiFePO4 / graphite yakazara sero ine bhatani cell, uye yakaongorora kutenderera kwekuita kwe electrolyte ine zvakasiyana-siyana zvekuwedzera pa20 ℃ uye 40 ℃.Migumisiro yekuongorora inoratidzwa mutafura iri pasi apa.Zvinogona kuonekwa kubva patafura kuti kushanda kwe electrolyte neLiTFSI yekuwedzera kwakakwira zvakanyanya kupfuura iyo ine VC yekuwedzera kekutanga, uye kuita kwebhasikoro pa20 ℃ kunotonyanya kurema.Chiyero chekuchengeta simba re electrolyte ine LiTFSI yekuwedzera i98.1% mushure memazana matanhatu, ukuwo mwero wekuchengeta simba re electrolyte neVC additive i79.6% chete.Nekudaro, mukana uyu unonyangarika kana iyo electrolyte ichitenderedzwa pa40 ℃, uye ese maelectrolyte ane maitiro ebhasikoro akafanana.
Kubva pane zvataurwa pamusoro apa, hazvina kuoma kuona kuti kutenderera kwekuita kwe lithium-ion bhatiri kunogona kuvandudzwa zvakanyanya kana lithium imide munyu inoshandiswa se electrolyte additive.Kuti tidzidze maitiro ekuita kwezvinowedzerwa seLiTFSI mumabhatiri e-lithium-ion, VARVARA sharova yakaongorora kuumbwa kwefirimu reSEI rakaumbwa pamusoro pegraphite anode mumaelectrolyte akasiyana neXPS.Iyi inotevera nhamba inoratidza iyo XPS yekuongorora mhedzisiro yeSEI firimu yakaumbwa pamusoro pegraphite anode mushure mekutanga uye makumi mashanu kutenderera.Zvinogona kuonekwa kuti iyo LIF yemukati muSEI firimu yakaumbwa mu electrolyte ine LiTFSI yekuwedzera yakanyanya kukwirisa kupfuura iri mu electrolyte ine VC yekuwedzera.Kuwedzera kuongororwa kwehuwandu hwekuumbwa kweSEI firimu kunoratidza kuti kurongeka kweLIF yemukati muSEI firimu ndeye lifsi> liftfsi> LiTFSI> VC> blank boka mushure mekutanga kutenderera, asi iyo SEI firimu haichinjiki mushure mekutanga kubhadharisa.Mushure mekutenderera makumi mashanu, iyo LIF yemukati meSEI firimu mu lifsi uye liftfsi electrolyte yakadzikira ne 12% ne 43%, zvichiteerana, nepo LIF yemukati me electrolyte yakawedzerwa neLiTFSI yakawedzera ne9%.
Kazhinji, isu tinofunga kuti chimiro cheSEI membrane chakakamurwa kuita zvidimbu zviviri: yemukati inorganic layer uye yekunze organic layer.Iyo inorganic layer inonyanya kuumbwa neLIF, Li2CO3 uye zvimwe zvimiro zvemukati, zvine zvirinani electrochemical performance uye yakakwirira ionic conductivity.Iyo yekunze organic layer inonyanya kuumbwa ne porous electrolyte decomposition uye polymerization zvigadzirwa, senge roco2li, PEO uye zvichingodaro, iyo isina kudzivirirwa kwakasimba kweiyo electrolyte, Naizvozvo, tinovimba kuti SEI membrane ine zvakawanda inorganic components.Imide additives inogona kuunza mamwe inorganic LIF zvikamu kune SEI membrane, iyo inoita kuti chimiro cheSEI membrane chigadzikane, inogona kudzivirira zvirinani kuparara kwe electrolyte mubhatiri kutenderera maitiro, kuderedza Li kushandiswa, uye zvakanyanya kunatsiridza kutenderera kuita kwebhatiri.
Sekuwedzera kwe electrolyte, kunyanya LiTFSI additives, imide lithium salt inogona kuvandudza zvakanyanya kutenderera kwebhatiri.Izvi zvinonyanya kukonzerwa nekuti iyo SEI firimu yakaumbwa pamusoro pegraphite anode ine LIF yakawanda, yakaonda uye yakatsiga SEI firimu, iyo inoderedza kuora kwe electrolyte uye inoderedza kupikisa kwechimiro.Nekudaro, kubva kune yazvino data yekuyedza, LiTFSI yekuwedzera inonyanya kukodzera kushandiswa pakamuri tembiricha.Pa40 ℃, LiTFSI yekuwedzera haina mukana uri pachena pamusoro peVC additive.
Nguva yekutumira: Kubvumbi-15-2021