Hauv daim ntawv no, qhov kev ua tau zoo tshaj ntawm 40Ah hnab roj teeb nrog cov electrode NCM111 + LMO tau kawm los ntawm kev sim thiab simulations.Lub overcharge tam sim no yog 0.33C, 0.5C thiab 1C, feem.Lub roj teeb loj yog 240mm * 150mm * 14mm.( xam raws li qhov ntsuas hluav taws xob ntawm 3.65V, nws lub zog tshwj xeeb yog li 290Wh / L, uas tseem qis dua)
Qhov hluav taws xob, qhov kub thiab txias thiab kev hloov pauv sab hauv thaum lub sijhawm overcharge yog qhia hauv daim duab 1. Nws tuaj yeem muab faib ua plaub theem:
Thawj theem: 1
Qhov thib ob theem: 1.2
Kauj ruam 3: 1.4
Qhov thib plaub theem: SOC> 1.6, lub siab sab hauv ntawm lub roj teeb tshaj qhov txwv, lub casing ruptures, lub diaphragm shrinks thiab deforms, thiab lub roj teeb thermal runaway.Lub voj voog luv luv tshwm sim hauv lub roj teeb, lub zog loj tau tso tawm sai, thiab qhov kub ntawm lub roj teeb nce siab mus rau 780 ° C.
Cov cua sov tsim tawm thaum lub sij hawm overcharge muaj xws li: reversible entropy tshav kub, Joule tshav kub, tshuaj tiv thaiv tshav kub thiab tshav kub tso tawm los ntawm internal short circuit.Cov cua sov ntawm cov tshuaj tiv thaiv muaj xws li cov cua sov tso tawm los ntawm kev sib cais ntawm Mn, cov tshuaj tiv thaiv ntawm cov hlau lithium nrog cov electrolyte, oxidation ntawm electrolyte, decomposition ntawm SEI zaj duab xis, decomposition ntawm qhov tsis zoo electrode thiab decomposition ntawm zoo electrode. (NCM111 and LMO).Table 1 qhia txog qhov hloov pauv enthalpy thiab ua kom lub zog ntawm txhua qhov tshuaj tiv thaiv.(Cov kab lus no tsis quav ntsej cov kev cuam tshuam sab ntawm cov binders)
Daim duab 3 yog kev sib piv ntawm cov hluav taws xob tsim hluav taws xob thaum lub sij hawm overcharging nrog cov nqi sib txawv.Cov lus xaus hauv qab no tuaj yeem kos los ntawm Daim duab 3:
1) Raws li kev them nyiaj tam sim no nce, lub sij hawm thermal runaway nce.
2) Thaum tshav kub kub ntau lawm overcharging yog dominated los ntawm Joule tshav kub.SOC <1.2, tag nrho cov khoom cua sov yog qhov sib npaug ntawm Joule tshav kub.
3) Hauv theem thib ob (1
4) SOC> 1.45, lub tshav kub tso tawm los ntawm cov tshuaj tiv thaiv ntawm cov hlau lithium thiab electrolyte yuav tshaj Joule tshav kub.
5) Thaum SOC> 1.6, cov tshuaj tiv thaiv decomposition ntawm SEI zaj duab xis thiab qhov tsis zoo electrode pib, qhov kub ntawm electrolyte oxidation cov tshuaj tiv thaiv nce siab, thiab tag nrho cov cua kub ntau lawm nce mus txog qhov kawg ntawm tus nqi.(Cov lus piav qhia hauv 4 thiab 5 hauv cov ntaub ntawv muaj qee qhov tsis sib xws nrog cov duab, thiab cov duab ntawm no yuav yeej thiab tau hloov kho.)
6) Thaum lub sij hawm overcharge txheej txheem, cov tshuaj tiv thaiv ntawm cov hlau lithium nrog cov electrolyte thiab oxidation ntawm electrolyte yog cov tshuaj tiv thaiv tseem ceeb.
Los ntawm cov kev soj ntsuam saum toj no, lub peev xwm oxidation ntawm cov electrolyte, lub peev xwm ntawm qhov tsis zoo electrode, thiab qhov pib kub ntawm thermal runaway yog peb qhov tseem ceeb rau kev overcharging.Daim duab 4 qhia txog qhov cuam tshuam ntawm peb qhov tseem ceeb ntawm kev ua tau zoo tshaj.Nws tuaj yeem pom tau tias qhov kev nce hauv oxidation muaj peev xwm ntawm cov electrolyte tuaj yeem txhim kho kev ua tau zoo ntawm lub roj teeb, thaum lub peev xwm ntawm qhov tsis zoo electrode muaj kev cuam tshuam me ntsis ntawm kev ua haujlwm dhau.(Hauv lwm lo lus, lub high-voltage electrolyte pab txhim kho lub overcharge kev ua tau zoo ntawm lub roj teeb, thiab nce N / P piv tsis tshua muaj kev cuam tshuam rau lub overcharge ntawm lub roj teeb.)
Cov ntaub ntawv
D. Ren et al.Phau ntawv Journal of Power Sources 364(2017) 328-340
Post lub sij hawm: Dec-15-2022