Kev cuam tshuam ntawm Carbon Txheej Thickness ntawm Aluminium Ntawv Nyiaj rau Kev Ua Haujlwm ntawm Lithium -Ion roj teeb

Aluminium ntawv ci yog thawj cathode tam sim no collector nyob rau hauv kev lag luam lithium{0}} ion roj teeb. Txawm li cas los xij, cov pa txhuas ntawv ci tam sim no muaj ntau qhov kev sib tw, suav nrog kev tiv thaiv kev tiv thaiv ntawm qhov sib cuam tshuam ntawm cov ntawv ci nruj thiab cov cathode cov khoom siv ua haujlwm, ua rau muaj kev cuam tshuam loj heev. Tsis muaj zog adhesion nrog cov khoom siv, ua ke nrog kev hloov pauv tas li ntawm cov electrode thaum lub sij hawm them nqi / tawm mus, tuaj yeem ua rau cov khoom siv detachment ("plua plav"), ua kom muaj peev xwm ploj mus thiab kev ua neej nyob. Tsis tas li ntawd, cov khoom lag luam los ntawm oxidative decomposition ntawm electrolyte tuaj yeem koom nrog cov tshuaj tiv thaiv electrochemical ntawm aluminium ntawv ci, ua kom nws cov corrosion. Txhawm rau daws cov teeb meem no, ntau txoj hauv kev hloov kho rau cov ntawv txhuas txhuas tau tshawb xyuas, suav nrog tshuaj lom neeg etching, electrochemical etching, DC anodization, kev kho mob corona, thiab cov coatings conductive (xws li graphene coatings, carbon nanotube coatings, thiab composite coatings) siv rau lub substrate nto. Ib txhia ntawm no twb tau siv nyob rau hauv cov khoom lag luam. Nyob rau hauv xyoo tas los no, cov coatings conductive, tshwj xeeb tshaj yog cov pa roj carbon-coated aluminium foil, tau pom dav siv. Cov laj thawj tseem ceeb yog lawv lub peev xwm los txo qhov cuam tshuam ntawm kev sib cuag ntawm lub cathode tam sim no sau, txo cov polarization, thiab yog li txhim kho lub roj teeb lub peev xwm tawm mus rau qee qhov.

Kev tshawb fawb tam sim no ntawm cov pa roj carbon-coated foils feem ntau tsom rau cov ntawv ci sib raug zoo nrog cov qauv cathode thiab cov nqi ua haujlwm. Cov txheej txheem xws li tshuaj lom neeg corrosion, electrochemical etching, thiab kev kho corona tuaj yeem txhim kho lub wettability thiab nto roughness ntawm txhuas ntawv ci, txo cov nqi hloov pauv, thiab txhim kho tus nqi thiab kev caij tsheb kauj vab. Cov txheej txheem xws li graphene, carbon nanotubes, thiab tiv thaiv - cov txheej txheem corrosion tau pom los txhim kho kev ua haujlwm ntawm tes. Piv txwv li, ib txoj kev tshawb fawb tau sau tseg tias graphene txheej ua rau tsuas yog 5 mΩ nce hauv kev tiv thaiv sab hauv tom qab 50 lub voj voog, ua kom pom qhov adhesion zoo. Thaum cov kev tshawb fawb tseem ceeb tau ua tiav ntawm cov tshuab slurry, kev siv cov txheej txheem, thiab cov thev naus laus zis kho saum npoo, qhov cuam tshuam ntawm carbon txheej thickness ntawm tag nrho cov xov tooj ntawm tes, tshwj xeeb tshaj yog nyob rau hauv tus nqi thiab cycling kev ua tau zoo ntawm Lithium Iron Phosphate (LFP) cathodes, tsis tshua muaj tau tshaj tawm. Txoj kev tshawb no feem ntau siv 16 μm tuab aluminium ntawv ci ua lub substrate los tshawb xyuas cov kev hloov pauv ntawm cov ntawv ci nrog ntau cov pa roj carbon txheej thicknesses thiab lawv cov kev cuam tshuam tom qab ntawm kev ua haujlwm ntawm tes.

Raws li pom nyob rau hauv nruab nrab ntawm lub rooj, qhov ntom ntom ntawm cov ntawv ci maj mam nce nrog cov txheej txheem txheej thickness. Cov hluav taws xob tsis kam ntawm cov ntawv ci tsis hloov linearly nrog tuab. Tag nrho cov khoom tam sim no nrog cov pa roj carbon txheej muaj qhov ua tau zoo dua li cov ntshiab txhuas, nrog rau qhov tseem ceeb ntawm 2 txog 6 npaug siab dua. Piv txwv Al-2 qhia qhov qis tshaj sab hauv, thaum Al-5 muaj qhov siab tshaj plaws. Qhov no yog ntaus nqi rau cov ntsiab lus ntawm (tsawg conductive) binder / colloidal cov ntaub ntawv nyob rau hauv lub txheej thaum lub txheej hnyav nce. Raws li cov pa roj carbon txheej thickness nce, qhov chaw sib cuag ntawm Lithium Iron Phosphate (LFP) cov khoom siv thiab cov txheej txheej txheej txheej kuj nce, ua rau muaj zog ntxiv. Txawm li cas los xij, nrog rau thaj tsam ntau dua, kev sib cuag ntawm cov khoom siv thiab cov ntaub ntawv / colloidal nyob rau hauv cov txheej txheem conductive kuj nce, yog li nce qhov kev tawm tsam.

Qhov saum npoo ntawm cov pa roj carbon-coated substrate tag nrho zoo nkaus li xoob thiab ntxeem tau. Piv rau liab qab aluminium ntawv ci, qhov saum npoo ua rougher, muab cov ntsiab lus sib cuag ntau dua. Qhov saum npoo topography undulation ua ntau pronounced nrog nce conductive txheej thickness. Txawm li cas los xij, txawm tias rau Al{10}}1 ntawv ci, cov pa roj carbon txheej yog coated sib npaug ntawm cov ntawv txhuas liab qab. Cov txheej txheem no muaj cov khoom nyob ib ncig ntawm 3.4 μm hauv qhov loj thiab cov khoom me me hauv 150-200 nm ntau yam, nrog qee cov agglomeration ntawm cov khoom los ntawm cov txheej txheem txheej slurry pom. Npib hlwb fabricated nrog carbon-coated aluminium foils ntawm txawv thicknesses tag nrho cov symmetrical oxidation thiab txo peaks, qhia zoo redox cov tshuaj tiv thaiv reversibility piv rau liab qab txhuas ntawv nyiaj. Qhov muaj peev xwm sib txawv ntawm cov oxidation thiab txo cov peaks yog me dua li ntawm liab qab aluminium ntawv ci, qhia tias muaj cov pa roj carbon txheej mitigates electrode polarization.

Los ntawm cov khoom physicochemical foundations

• Lub tev lub zog ntawm daim ntawv electrode nce nrog carbon txheej thickness.
• Qhov tsis kam ntawm daim ntawv electrode nce nrog txheej thickness.
• Qhov tsawg kawg nkaus tus nqi tiv thaiv tau pom ntawm tag nrho cov tuab ntawm 2.0 μm.
• Ntawm cov thicknesses ntawm 4.0 μm thiab 5.0 μm, tus nqi hloov pauv tsis kam nce, lub peev xwm diffusion ntawm Li + tsis muaj zog, thiab polarization nce.
• Cov txiaj ntsig no qhia tau tias cov pa roj carbon txheej thickness yuav tsum tau tswj nyob rau hauv qhov tsim nyog.

Los ntawm tag nrho -cell electrochemical kev ua tau zoo foundations

• Cov pa roj carbon-coated aluminium foil qhia tau zoo nyob rau hauv chav tsev kub 0.5C thiab 2.0C kev caij tsheb kauj vab, nrog rau qis- qhov kub thiab txias ua haujlwm ntawm -20℃.
• Kev ua haujlwm zoo tshaj plaws nyob rau hauv cov xwm txheej no tau pom ntawm tag nrho cov txheej tuab ntawm 2.0 μm.
• Cov kev sim no tseem qhia tau hais tias ntawm 1.0C tam sim no tus nqi, cov ntawv txhuas liab qab tau nthuav tawm kev ua haujlwm zoo tshaj plaws, tuav ntau dua 90% kev tuav pov hwm tom qab 1,500 cycles. Qhov kev tshawb pom no muab kev taw qhia rau kev tshawb nrhiav ntxiv rau hauv cov txheej txheem ntawm carbon-coated aluminium foil.
• Qhov kev ua tau zoo sib txawv nrog cov pa roj carbon txheej sib txawv. Siv cov txheej tuab tuab heev (piv txwv li, 4.0 μm thiab 5.0 μm) tsis tuaj yeem txhim kho cov roj teeb ua haujlwm tau zoo tab sis tsis txhob siv cov khoom siv slurry thiab nce nqi.
• Thaum liab qab aluminium ntawv ci tuaj yeem ua tiav lub voj voog zoo tshaj plaws ntawm 1.0C, nws txoj kev ncig lub voj voog qhia tau tias muaj kev hloov pauv loj, uas ua rau muaj kev puas tsuaj rau tom qab - theem kwv yees ntawm lub roj teeb Lub Xeev Kev Noj Qab Haus Huv (SOH).

Xav txog tag nrho cov ntsuas kev nkag siab, tag nrho cov pa roj carbon txheej thickness ntawm1.0 μmsawv cev rau tus nqi zoo tshaj -kev xaiv kev ua tau zoo rau carbon-coated aluminium foil.

Cov ntaub ntawv
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