I. Kev qhia lus
Lithium roj teeb, raws li lub zog tseem ceeb khaws cia, tau siv dav hauv zej zog, xws li hauv cov hluav taws xob thiab cov khoom siv hluav taws xob. Txawm li cas los xij, cov roj teeb lithium yuav ua rau muaj kev sib tw luv luv thaum siv tau, uas tsis yog tsuas yog cuam tshuam rau cov teeb meem kev nyab xeeb, xws li cov hluav taws thiab cov tawg. Sab hauv kev tawm tsam yog ib qho ntawm cov ntsuas tseem ceeb rau kev ntsuas roj teeb lithium lithium. Qhov nce ntxiv hauv kev tiv thaiv sab hauv kev ua rau txo qis hauv roj teeb tawm, kev txo qis hauv lub peev xwm. Yog li ntawd, kawm cov ua kom muaj teeb meem sab hauv kev nce hauv cov roj teeb lithium thaum lub sijhawm luv luv muaj qhov tseem ceeb theoretical thiab qhov tseem ceeb.
Ii. Kev sib xyaw ntawm Lithium roj teeb sab hauv kev tiv thaiv
Sab hauv kev tawm tsam ntawm lub roj teeb lithium feem ntau muaj cov ohmic tiv taus thiab polarization tsis kam. HUMIC INFORANCE suav nrog cov kev tiv thaiv ntawm cov electrodes lawv tus kheej, qhov kev tiv thaiv ntawm cov microstrolyte daws ntawm cov khoom siv \/ cov hluav taws xob tsis zoo thiab cov separator. Kev tiv thaiv polarization Polarizance yog qhov kev coj ua tsis kam tsim vim muaj hluav taws xob hluav taws xob thaum lub roj teeb thiab rho nyiaj polarization thiab conforchring polarization. Electrochemical polarization yog tshwm sim los ntawm kev tsis txaus ntseeg ntawm electrode, thaum kev hloov pauv polarization yog tshwm sim los ntawm kev hloov pauv ntawm ion thiab cov hluav taws xob hauv hluav taws xob.
III. Kev tsom xam ntawm cov ua rau ntawm sab hauv kev nce nce hauv cov roj teeb lithium thaum lub sijhawm luv luv
(I) cov khoom siv-theem hauv paus theem ua rau
1. Kev txheeb ntawm cov khoom siv zoo thiab tsis zoo
Positive electrode materials (such as NCM, LFP) may experience a decrease in electronic conductivity due to the dissolution of transition metals or structural collapse. For example, during the long-term cycling of a battery, transition metal ions in the positive electrode material may dissolve into the electrolyte, leading to structural changes in the positive electrode material and a reduction in its electronic conductivity. Negative electrode graphite may increase lithium ion migration resistance due to the growth of lithium dendrites or an excessively thick SEI film (>100 nm). Kev loj hlob ntawm Lithium Dendrites muaj peev xwm permatorse separcuit Court, thaum ib qho kev ua yeeb yaj kiab luv, thaum muaj kev khiav tawm hauv Lithium ion Migration thiab nce roj teeb sab hauv tsis kam.
2.eleltrolyte laus thiab cov teeb meem interface
Electrolyte Khoom (xws li Life, L₂CO₃) tsub rau ntawm cov chaw hluav taws xob, sib sau lub siab-impedance interface txheej. Nyob rau hauv high-kub los yog ntsuas feem ntau ntawm cov kev mob, electrolyte viscosity nce, thiab Lithium ion thauj mus los. Piv txwv li, thaum lub roj teeb nyob hauv ib puag ncig kub-huab cua, thiab kev tsiv teb chaws ntawm lithium ase slows cia, ua kom muaj kev nce hauv roj teeb sab hauv kev tiv thaiv.
3.current collector thiab tab degradation
Oxidation lossis corrosion ntawm aluminium \/ tooj liab ntawv ua kom muaj kev nce ntxiv hauv kev sib cuag tiv thaiv (ntau yam hauv cov av noo ib puag ncig). Virtual Vuam ntawm tab welding cov ntsiab lus lossis cov khoom siv nkees (xws li nyob rau hauv kev co kev mob) ua rau muaj kev sib tw hauv zos kom ntau. Thaum lub roj teeb siv, cov sau ntawv tam sim no thiab cov tabs tuaj yeem yub los yog corrosion vim ib puag ncig qee qhov, ua rau muaj kev nce ntxiv. Nyob rau tib lub sijhawm, virtual vuam ntawm tab welding cov ntsiab lus lossis cov khoom siv tsis muaj zog kuj tuaj yeem ua kom muaj kev tiv thaiv feem ntau.
(II) cov nyhuv rau cov txheej txheem tsis xws luag
1.Uneven txheej ntawm electrodoo cov nplooj ntawv
Fessedency hauv Aneal ntom ntom (± 5% lossis ntau dua) ua rau tsis sib xws thiab muaj kev nce qib tseem ceeb hauv cheeb tsam Polarization tsis kam. Yog hais tias txheej txheej electrody yog tsis ncaj, nws yuav ua rau tsis ncaj ncees sab hauv lub roj teeb, yog ua rau muaj kev nce qib ntau dhau ntawm kev ua haujlwm hauv zos.
2.Kev ua yuam kev hauv txheej txheem \/ winding
Misalignment ntawm electrode cov ntawv ua rau Edground Burr Sib cuag, nce kev pheej hmoo ntawm micro-luv cig thiab impedance. Thaum lub sij hawm tsim hluav taws xob, yog tias muaj qhov yuam kev hauv cov txheej txheem stacking lossis winding
3.Kev txhaj tshuaj tsis txaus electrolyte txhaj thiab ntub dej
Lub electrolyte tsis nkag siab tas mus li rau lub separator pores (ntub dej <90%), thaiv ion raws. Yog tias cov electrolyte tsis nkag rau hauv lub voos siab sib txawv, nws yuav thaiv ion raws li lithium ions, thiab nce roj teeb sab hauv kev tiv taus.
(III) cuam tshuam ntawm kev siv ib puag ncig thiab kev ua haujlwm
1.Tsawg-kub ib puag ncig
Cov Ionic conductivity ntawm electrolyte txo qis dua 50%, thiab ob qho tib sihmic kuj thiab polarization tiv taus. Hauv qhov tsawg-kub ib puag ncig, ionic conductivity ntawm electrolyte txo qis, ua rau muaj kev nce ntxiv hauv roj teeb ohmic tsis kam.
2.Cov nqi them siab tus nqi thiab rho tawm
Kev nkag siab zoo polarization ua ke, lub voltage platform tsaus muag, thiab zoo sab hauv kev nce los ntawm 20% {1}}%. Thaum lub roj teeb undergoes them tus nqi siab thiab kev faib tawm nyob ze ntawm electrode kev hloov pauv sai, ua kom muaj kev cuam tshuam kom muaj zog dua, ua rau muaj kev cuam tshuam rau kev tiv thaiv zoo.
3.Lub Sij Hawm Ntev Ua Haujlwm
Cumulative cuam tshuam xws li Lithium Active thiab txo hauv electrode porosity ua rau ib qho kev nce qib sab hauv kev loj hlob tshaj 5%. Thaum lub sijhawm caij tsheb kauj vab mus sij hawm ntev Cov kev sib tw no ua rau muaj kev cuam tshuam nrog Kev Tiv Thaiv Sab Hauv Kev Loj Hlob Qib Siab Tshaj 5%.
(Iv) Lub zos overheating thiab cov txheej txheem kev puas tsuaj los ntawm cov voj voog luv
1.Local overheating
Qhov loj tam sim no tau tsim thaum lub sijhawm luv luv hauv lub nroog luv luv ua rau lub ntsej muag ntse hauv qhov kub hauv nroog sab hauv lub roj teeb. Kev sim siab kub ua rau muaj kev cuam tshuam ntawm cov khoom siv hluav taws xob sab hauv, xws li cov qauv hluav taws xob thiab hloov pauv ntawm cov khoom siv hluav taws xob, ntxiv ntxiv ntxiv ntxiv rau sab hauv kev tiv thaiv. Piv txwv li, thaum muaj roj teeb tej kev paub luvfab, ua rau muaj qhov kub thiab txias ua kom nce thiab ua rau muaj hluav taws xob siab thiab ua kom muaj roj teeb nce sab hauv kev tiv thaiv.
2.Xlub tsim kev puas tsuaj
Qhov loj loj tam sim no thiab kub tsim thaum lub sijhawm luv luv hauv lub tsheb yuav ua rau muaj kev puas tsuaj hauv lub roj teeb, xws li separator melting thiab electrode khoom lag luam. Cov teeb meem kev puas tsuaj ncaj qha cuam tshuam rau Ion thiab Electron Thauj raws ntawm lub roj teeb, ua rau muaj kev nce qib tseem ceeb hauv kev tawm tsam sab hauv. Piv txwv li, qhov kub kub tsim tawm thaum lub sijhawm luv luv hluav taws xob yuav yaj tus qauv ntawm cov ntaub ntawv zoo thiab tsis zoo ntawm cov khoom siv hluav taws xob, ua kom muaj roj teeb sab hauv kev tiv taus.
IV. Tag
Cov teeb meem ntawm sab hauv kev nce hauv cov roj teeb lithium rau cov txheej txheem luv luv, suav nrog cov khoom siv ntawm cov khoom siv ntawm cov khoom siv thiab cov khoom siv hluav taws xob ntau thiab cov txheej txheem kev puas tsuaj los ntawm cov voj voog luv luv. Cov xwm txheej no cuam tshuam nrog txhua lwm yam, sib sau ua ke rau kev nce hauv sab hauv kev tawm tsam hauv cov roj teeb lithium thaum lub sijhawm luv luv. Nkag siab cov ua rau muaj qhov tseem ceeb rau cov qauv tsim, tsim khoom, siv cov roj teeb lithium. Nyob rau hauv lub roj teeb tsim theem, cov khoom tsim nyog yuav tsum tau xaiv thiab cov txheej txheem ua kom zoo rau txo cov roj teeb sab hauv kev tiv thaiv. Thaum siv roj teeb, cov roj teeb yuav tsum tau ceev kom deb ntawm kev siv hluav taws xob siv hluav taws xob ib puag ncig thiab cov roj teeb uas yuav tsum tau tswj hwm lub neej thiab kom muaj roj teeb kev nyab xeeb. Nyob rau tib lub sijhawm, rau cov roj teeb uas tau ntsib qhov kev kho mob luv luv, lub sijhawm kev kho mob yuav tsum tau ua kom tsis txhob muaj teeb meem kev nyab xeeb ntau dua. Kev tshawb fawb yav tom ntej yuav tsum tau rov qab mus rau hauv cov txheej txheem ntawm kev tswj hwm roj teeb thiab tsim kev tiv thaiv roj teeb ua kom zoo thiab muaj teeb meem kev nyab xeeb ntau dua thiab kev nyab xeeb.