Sebakeng sa mocheso o tlase, ts'ebetso ea betri ea lithium-ion ha e ntle.Ha libeteri tsa lithium-ion tse sebelisoang ka tloaelo li sebetsa ho -10 ° C, matla a tsona a phahameng a tefiso le matla a ho lahla le motlakase o tla fokotseha haholo ha o bapisoa le mocheso o tloaelehileng [6], ha mocheso oa mocheso o theoha ho -20 ° C, matla a teng a tla fokotseha haholo. esita le ho fokotsoa ho 1/3 mocheso oa kamore 25 ° C, ha mocheso oa mocheso o le tlase, libeteri tse ling tsa lithium ha li khone ho lefella le ho ntša mesebetsi, li kena "betri e shoeleng" mmuso.
1, Litšobotsi tsa libeteri tsa lithium-ion ka mocheso o tlase
(1) E manyenyane
Liphetoho tse khethollang betri ea lithium-ion ka mocheso o tlaase ke tse latelang: ka ho fokotseha ho tsoelang pele ha mocheso, ho hanyetsa ohmic le ho hanyetsa polarization ho eketseha ka likhato tse fapaneng;Matla a ho lahla a betri ea lithium-ion a tlase ho feta mocheso o tloaelehileng.Ha e tjhaja le ho tjhaja ka mocheso o tlase, matla a yona a ho sebetsa a nyoloha kapa a theoha ka potlako ho feta mocheso o tlwaelehileng, e leng se bakang phokotso e kgolo ho matla le matla a lona a ka sebediswang.
(2) Ka microscope
Liphetoho tsa ts'ebetso ea libeteri tsa lithium-ion ka mocheso o tlase haholo-holo ka lebaka la tšusumetso ea lintlha tse latelang tsa bohlokoa.Ha mocheso oa tikoloho o le tlase ho -20 ℃, electrolyte ea metsi ea tiea, viscosity ea eona e eketseha haholo, 'me ionic conductivity ea eona ea fokotseha.Lithium ion diffusion ka thepa e ntle le e mpe ea li-electrode e lieha;Lithium ion ho thata ho e senya, 'me phetisetso ea eona filiming ea SEI e lieha,' me phetiso ea phetisetso ea tefiso ea eketseha.Bothata ba lithium dendrite bo hlahella ka ho khetheha mocheso o tlase.
2, Ho rarolla ts'ebetso e tlase ea mocheso oa libeteri tsa lithium-ion
Rala mokhoa o mocha oa mokelikeli oa electrolytic ho kopana le tikoloho ea mocheso o tlase;Ntlafatsa sebopeho sa li-electrode tse ntle le tse mpe ho potlakisa lebelo la phetisetso le ho khutsufatsa sebaka sa phetiso;Laola sehokelo se setle le se fosahetseng sa electrolyte ho fokotsa ts'ebetso.
(1) metsoako ea electrolyte
Ka kakaretso, tšebeliso ea li-additives tse sebetsang ke e 'ngoe ea litsela tse sebetsang ka ho fetisisa le tsa moruo tsa ho ntlafatsa ts'ebetso ea mocheso o tlase oa betri le ho thusa ho theha filimi e loketseng ea SEI.Hajoale, mefuta ea mantlha ea li-additives ke li-additives tse thehiloeng ho isocyanate, li-additives tse thehiloeng ho sebabole, li-additives tsa metsi a ionic le li-additives tsa inorganic lithium letsoai.
Mohlala, li-additives tse thehiloeng ho dimethyl sulfite (DMS) tse nang le ts'ebetso e nepahetseng ea ho fokotsa, le hobane lihlahisoa tsa eona tsa phokotso le tlamo ea lithium ion li fokola ho feta vinyl sulfate (DTD), ho fokotsa ts'ebeliso ea li-additives tsa organic ho tla eketsa ts'ebetso ea sehokelo. e tsitsitseng haholoanyane le e ntlafetseng ea ionic conductivity ea filimi e mpe ea electrode interface.Li-esters tsa sulfite tse emeloang ke dimethyl sulfite (DMS) li na le mocheso o phahameng oa dielectric le mocheso o pharaletseng o sebetsang.
(2) Mokelikeli oa electrolyte
Electrolyte e tloaelehileng ea lithium-ion battery ke ho qhaqha 1 mol ea lithium hexafluorophosphate (LiPF6) ka har'a motsoako o tsoakiloeng, o kang EC, PC, VC, DMC, methyl ethyl carbonate (EMC) kapa diethyl carbonate (DEC), moo sebopeho sa solvent, melting point, dielectric constant, viscosity le ho lumellana le lithium letsoai ho tla ama ka ho teba mocheso o sebetsang oa betri.Hona joale, electrolyte ea khoebo e bonolo ho tiisa ha e sebelisoa sebakeng sa mocheso o tlase oa -20 ℃ le ka tlase, ho lula ho le tlaase ho etsa hore letsoai la lithium le be thata ho arola, 'me viscosity e phahame haholo ho etsa hore betri e kene ka hare le e tlaase. sethala sa motlakase.Libetri tsa lithium-ion li ka ba le ts'ebetso e ntle ea mocheso o tlase ka ho ntlafatsa karo-karolelano e teng ea solvent, joalo ka ka ho ntlafatsa sebopeho sa electrolyte (EC:PC:EMC=1:2:7) e le hore TiO2(B)/graphene negative electrode e be le A. bokgoni ba ~ 240 mA h g-1 ho -20 ℃ le 0.1 A g-1 segokanyipalo hona joale.Kapa hlahisa litlhare tse ncha tsa mocheso o tlase oa electrolyte.Ts'ebetso e mpe ea libeteri tsa lithium-ion ka mocheso o tlase haholo-holo e amana le ho senyeha butle ha Li + nakong ea ts'ebetso ea ho kenngoa ha Li + ka thepa ea electrode.Lintho tse nang le matla a tlase a tlamang lipakeng tsa Li+ le limolek'hule tsa solvent, joalo ka 1, 3-dioxopentylene (DIOX), li ka khethoa, 'me nanoscale lithium titanate e sebelisoa e le lisebelisoa tsa elektrode ho kopanya teko ea betri ho lefella coefficient e fokotsehileng ea phallo. lisebelisoa tsa elektrode ka mocheso o tlase haholo, e le ho fihlela ts'ebetso e ntle ea mocheso o tlase.
(3) letsoai la lithium
Hajoale, ion ea LiPF6 ea khoebo e na le conductivity e phahameng, litlhoko tse phahameng tsa mongobo tikolohong, botsitso bo fokolang ba mocheso, le likhase tse mpe tse kang HF ka karabelo ea metsi li bonolo ho baka likotsi tsa polokeho.Filimi e tiileng ea electrolyte e hlahisoang ke lithium difluoroxalate borate (LiODFB) e tsitsitse ka ho lekaneng 'me e na le ts'ebetso e ntle ea mocheso o tlase le ts'ebetso e phahameng ea tekanyo.Sena ke hobane LiODFB e na le melemo ea lithium dioxalate borate (LiBOB) le LiBF4.
3. Kakaretso
Ts'ebetso e tlase ea mocheso oa libeteri tsa lithium-ion e tla angoa ke lintlha tse ngata tse kang lisebelisoa tsa electrode le electrolyte.Ntlafatso e felletseng ho tsoa mekhoeng e mengata e kang lisebelisoa tsa electrode le electrolyte e ka khothaletsa ts'ebeliso le nts'etsopele ea libeteri tsa lithium-ion, mme tebello ea ts'ebeliso ea libeteri tsa lithium e ntle, empa theknoloji e hloka ho ntlafatsoa le ho phethahala lipatlisisong tse ling.
Nako ea poso: Jul-27-2023