Qhov cuam tshuam ntawm kev tswj qhov kub thaum lub sijhawm ua graphitization rau kev ua haujlwm ntawm electrode tuaj yeem muab sau ua cov ntsiab lus tseem ceeb hauv qab no:
1. Kev Tswj Kub Ncaj Qha Cuam Tshuam rau Qib Graphitization thiab Cov Qauv Crystal
Kev Txhim Kho Qib Graphitization: Cov txheej txheem graphitization xav tau qhov kub siab (feem ntau yog li ntawm 2500 ° C txog 3000 ° C), thaum lub sijhawm uas cov pa roj carbon hloov pauv los ntawm kev co thermal los tsim cov qauv graphite txheej txheem. Qhov tseeb ntawm kev tswj qhov kub thiab txias cuam tshuam ncaj qha rau qib graphitization:
- Kub Qis (<2000°C): Cov pa roj carbon feem ntau tseem nyob hauv cov qauv txheej txheem tsis sib xws, ua rau qib graphitization qis. Qhov no ua rau tsis txaus hluav taws xob conductivity, thermal conductivity, thiab mechanical strength ntawm lub electrode.
- Kub Siab (saum toj no 2500 ° C): Cov pa roj carbon atoms rov qab hloov pauv tag nrho, ua rau qhov loj ntawm cov graphite microcrystals nce ntxiv thiab txo qhov sib nrug ntawm cov txheej. Cov qauv siv lead ua kom zoo dua, yog li ua rau lub electrode muaj hluav taws xob zoo dua, kev ruaj khov ntawm tshuaj lom neeg, thiab lub neej voj voog.
Kev Txhim Kho Cov Qauv Siv Crystal: Kev tshawb fawb qhia tau hais tias thaum qhov kub ntawm graphitization tshaj 2200 ° C, qhov chaw siab ntawm cov koob coke yuav ruaj khov dua, thiab qhov ntev ntawm qhov chaw siab sib raug zoo nrog qhov nce ntawm graphite microcrystal loj, qhia tias qhov kub siab txhawb nqa kev txiav txim ntawm cov qauv siv lead ua.
2. Kev Tswj Kub Cuam Tshuam Cov Khoom Tsis Huv Thiab Kev Huv Si
Kev Tshem Tawm Cov Khoom Tsis Huv: Thaum lub sijhawm tswj hwm kev ua kom sov ntawm qhov kub ntawm 1250 ° C thiab 1800 ° C, cov khoom tsis yog carbon (xws li hydrogen thiab oxygen) tawm hauv cov pa roj, thaum cov hydrocarbons uas muaj qhov hnyav molecular tsawg thiab cov pab pawg tsis huv lwj, txo cov khoom tsis huv hauv lub electrode.
Kev Tswj Tus Nqi Kub: Yog tias tus nqi kub sai dhau, cov pa roj uas tsim los ntawm kev lwj ntawm cov khoom tsis huv yuav raug kaw, ua rau muaj qhov tsis zoo sab hauv ntawm lub electrode. Ntawm qhov tod tes, tus nqi kub qeeb yuav ua rau siv hluav taws xob ntau dua. Feem ntau, tus nqi kub yuav tsum tau tswj ntawm 30 ° C / h thiab 50 ° C / h kom sib npaug ntawm kev tshem tawm cov khoom tsis huv thiab kev tswj hwm kev ntxhov siab thermal.
Kev Txhim Kho Kev Huv Si: Thaum kub siab, cov carbides (xws li silicon carbide) yuav lwj mus ua cov pa hlau thiab graphite, ua rau cov khoom tsis huv ntxiv thiab ua rau lub electrode huv si dua. Qhov no, ua rau txo cov kev tsis haum tshuaj thaum lub sijhawm them-tso tawm thiab ua rau lub roj teeb siv tau ntev dua.
3. Kev Tswj Kub thiab Electrode Microstructure thiab Cov Khoom Nto
Microstructure: Qhov kub ntawm graphitization cuam tshuam rau cov qauv ntawm cov khoom me me thiab cov nyhuv ntawm cov electrode. Piv txwv li, cov roj-raws li koob coke kho ntawm qhov kub ntawm 2000 ° C thiab 3000 ° C tsis muaj qhov poob ntawm cov khoom me me thiab kev ua haujlwm zoo ntawm cov khoom sib txuas, tsim cov qauv khoom me me ruaj khov. Qhov no ua rau cov channel sib xyaw lithium-ion nce ntxiv thiab ua rau qhov ceev tiag tiag thiab qhov ceev ntawm cov electrode.
Cov Khoom Ntawm Qhov Nto: Kev kho kub siab txo qhov tsis zoo ntawm qhov chaw ntawm lub electrode, txo qhov chaw tshwj xeeb ntawm qhov chaw. Qhov no, ua rau txo qis qhov kev puas tsuaj ntawm electrolyte thiab kev loj hlob ntau dhau ntawm cov zaj duab xis electrolyte interphase (SEI), txo qhov kev tiv thaiv sab hauv ntawm lub roj teeb thiab txhim kho kev ua haujlwm ntawm kev them-tawm.
4. Kev Tswj Kub Tswj Kev Ua Haujlwm Hluav Taws Xob ntawm Cov Hluav Taws Xob
Kev Cia Khoom Lithium: Qhov kub ntawm graphitization cuam tshuam rau qhov sib nrug ntawm cov txheej thiab qhov loj ntawm cov graphite microcrystals, yog li tswj hwm kev sib xyaw / deintercalation ntawm cov lithium ions. Piv txwv li, koob coke kho ntawm 2500 ° C qhia txog qhov chaw ruaj khov dua thiab muaj peev xwm cia lithium ntau dua, qhia tias qhov kub siab txhawb nqa qhov zoo tshaj plaws ntawm cov qauv siv lead ua graphite thiab txhim kho qhov kev ua tau zoo electrochemical ntawm electrode.
Kev Ruaj Ntseg ntawm Lub Voj Voog: Kev ua graphitization thaum kub siab txo qhov kev hloov pauv ntawm lub electrode thaum lub sijhawm them-tawm, txo qhov kev ntxhov siab thiab yog li ntawd tiv thaiv kev tsim thiab nthuav dav ntawm cov kab nrib pleb, uas ua rau lub roj teeb lub neej ntev dua. Kev tshawb fawb qhia tau tias thaum qhov kub ntawm graphitization nce ntxiv los ntawm 1500 ° C txog 2500 ° C, qhov tseeb ntawm cov graphite hluavtaws nce ntxiv los ntawm 2.15 g / cm³ txog 2.23 g / cm³, thiab kev ruaj ntseg ntawm lub voj voog zoo dua qub.
5. Kev Tswj Kub thiab Electrode Thermal Stability thiab Kev Nyab Xeeb
Kev Ruaj Ntseg Thermal: Kev ua graphitization thaum kub siab ua rau lub electrode tsis kam oxidation thiab thermal stability zoo dua. Piv txwv li, thaum qhov kub oxidation txwv ntawm graphite electrodes hauv huab cua yog 450 ° C, cov electrodes uas raug kho kub siab tseem ruaj khov ntawm qhov kub siab dua, txo qhov kev pheej hmoo ntawm thermal runaway.
Kev Nyab Xeeb: Los ntawm kev ua kom zoo tshaj plaws kev tswj qhov kub thiab txias, qhov kev ntxhov siab sab hauv ntawm lub electrode tuaj yeem txo qis, tiv thaiv kev tawg thiab yog li ntawd txo cov kev phom sij ntawm kev nyab xeeb hauv cov roj teeb thaum muaj qhov kub thiab txias lossis overcharge.
Cov Tswv Yim Tswj Kub Hauv Kev Siv Ua Haujlwm
Kev Ua Kub Ntau Theem: Kev siv txoj hauv kev ua kom sov theem (xws li kev ua ntej ua kom sov, carbonization, thiab graphitization theem), nrog rau cov nqi cua sov sib txawv thiab qhov kub thiab txias teem rau txhua theem, pab sib npaug ntawm kev tshem tawm cov khoom tsis huv, kev loj hlob ntawm cov siv lead ua, thiab kev tswj hwm kev ntxhov siab thermal.
Kev Tswj Huab Cua: Kev ua graphitization hauv cov roj inert (xws li nitrogen lossis argon) lossis txo cov roj (xws li hydrogen) huab cua tiv thaiv kev oxidation ntawm cov khoom siv carbon thaum txhawb kev hloov pauv ntawm cov pa roj carbon thiab kev tsim cov qauv graphite.
Kev Tswj Tus Nqi Txias: Tom qab ua tiav graphitization, lub electrode yuav tsum tau txias qeeb qeeb kom tsis txhob muaj cov khoom tawg lossis deformation los ntawm kev hloov pauv kub sai sai, kom ntseeg tau tias lub electrode muaj kev ncaj ncees thiab kev ua haujlwm ruaj khov.
Lub sijhawm tshaj tawm: Lub Xya Hli-15-2025