Cov ntsiab lus tseem ceeb ntawm cov kev cai ntsuas rau graphitized roj av coke hauv ntau daim ntawv thov (xws li lithium roj teeb anodes thiab cathodes rau txhuas) yog dab tsi?

Cov Kev Cai Sib Txawv rau Cov Roj Av Graphitized Coke hauv Ob Lub Chaw Siv Tseem Ceeb: Lithium-ion Battery Anodes thiab Aluminium Cathodes

Cov kev cai ntsuas rau cov roj av coke uas muaj graphitized qhia txog qhov sib txawv tseem ceeb hauv cov tshuaj lom neeg, cov qauv lub cev, thiab kev ua haujlwm electrochemical thoob plaws cov roj teeb lithium-ion anodes thiab txhuas cathodes. Cov ntsiab lus tseem ceeb tau muab sau ua raws li hauv qab no:

I. Cov Anodes Roj Teeb Lithium-ion: Kev Ua Haujlwm Hluav Taws Xob Ua Lub Hauv Paus, nrog rau Kev Ruaj Ntseg ntawm Cov Qauv

1. Cov Ntsiab Lus Sulfur Tsawg (<0.5%)
   Cov seem sulfur tuaj yeem ua rau cov siv lead ua kom sib zog thiab nthuav dav thaum lub sijhawm graphitization, ua rau electrode tawg. Tsis tas li ntawd, sulfur tuaj yeem tso cov pa roj tawm ntawm qhov kub siab, ua rau puas tsuaj rau cov khoom siv electrolyte interphase (SEI) zaj duab xis thiab ua rau lub peev xwm poob qis. Piv txwv li, GB / T 24533-2019 yuam kom tswj hwm cov ntsiab lus sulfur rau graphite siv hauv cov roj teeb lithium-ion anodes.
2. Cov ntsiab lus tshauv tsawg (≤0.15%)
   Cov hlau tsis huv hauv cov tshauv (piv txwv li, sodium, hlau) ua rau cov electrolyte decomposition, ua rau lub roj teeb puas sai dua. Cov sodium tsis huv kuj tseem tuaj yeem ua rau anode honeycomb oxidation, txo lub neej voj voog. Graphite uas muaj kev ntshiab siab xav tau cov txheej txheem "peb-siab" (kub siab, siab siab, cov khoom siv raw uas muaj kev ntshiab siab) kom txo cov tshauv hauv qab 0.15%.
3. Crystallinity siab thiab kev npaj ua kom pom tseeb
   • Qhov Ceev Tseeb Siab: Qhia txog qhov crystallinity ntawm graphite; qhov ceev tiag siab dua ua kom muaj cov channel rau kev ntxig/rho tawm lithium-ion, ua kom kev ua haujlwm nrawm dua.
   • Cov Coefficient Kev Nthuav Dav Thermal Qis: Cov coke koob, nrog nws cov qauv fibrous, qhia txog 30% qis dua cov coke daim txhuam cev, txo qhov ntim nthuav dav thaum lub sijhawm them / tawm (piv txwv li, anisotropic graphite nthuav dav raws C-axis, ua rau lub roj teeb o).
4. Qhov Loj ntawm Cov Khoom Sib Npaug thiab Thaj Chaw Nto Tshwj Xeeb
   • Kev Faib Qhov Loj ntawm Cov Khoom Me Me: Cov kev teeb tsa D10, D50, thiab D90 zoo tshaj plaws ua rau cov khoom me me tuaj yeem sau cov qhov khoob ntawm cov loj dua, txhim kho qhov ceev ntawm cov kais (qhov ceev ntawm cov kais siab dua ua rau cov khoom siv nquag thauj khoom ib chav, txawm hais tias cov qib ntau dhau txo qhov electrolyte ntub).
   • Thaj Chaw Nto Tshwj Xeeb Nruab Nrab: Thaj chaw nto tshwj xeeb siab (>10 m²/g) ua rau txoj kev tsiv teb tsaws chaw lithium-ion luv dua, ua kom nrawm dua, tab sis ua rau thaj chaw zaj duab xis SEI loj dua, txo qis kev ua haujlwm coulombic thawj zaug (ICE).
5. Kev Ua Haujlwm Coulombic Siab Thaum Pib (≥92.6%)
   Txo kev siv lithium thaum lub sijhawm tsim SEI thaum lub sijhawm them/tso tawm thawj zaug yog qhov tseem ceeb rau kev tswj hwm lub zog ceev. Cov qauv xav tau lub peev xwm tso tawm thawj zaug ≥350.0 mAh / g thiab ICE ≥92.6%.

II. Cov Khoom Siv Aluminium Cathodes: Kev Ua Hluav Taws Xob thiab Kev Tiv Thaiv Kev Kub Ntxhov Ua Qhov Tseem Ceeb

1. Kev Tswj Xyuas Cov Tshuaj Sulfur Qib
   • Cov Coke Uas Muaj Sulfur Tsawg (S < 0.8%): Siv rau hauv cov electrodes graphite zoo tshaj plaws los tiv thaiv cov pa roj uas ua rau muaj sulfur thiab tawg thaum lub sijhawm ua hlau, txo kev siv hlau ib tuj (piv txwv li, ib lub tuam txhab txo kev siv anode los ntawm 12% siv cov coke uas muaj sulfur tsawg).
   • Medium-sulfur Coke (S 2%–4%): Haum rau cov anodes electrolysis txhuas, sib npaug tus nqi thiab kev ua tau zoo.
2. Kev Tiv Thaiv Cov Tshauv Siab (nrog Kev Tswj Xyuas Kev Ua Phem Tshwj Xeeb)
   Cov ntsiab lus ntawm vanadium hauv cov tshauv yuav tsum yog ≤0.03% kom tsis txhob muaj kev poob qis ntawm cov txiaj ntsig tam sim no ntawm aluminium electrolysis. Cov khoom tsis huv ntawm sodium yuav tsum tau tswj hwm nruj kom tiv thaiv kev oxidation ntawm anode honeycomb.
3. Crystallinity siab thiab Thermal Shock Resistance
   Cov koob coke yog qhov nyiam rau nws cov qauv fibrous, uas muaj qhov ceev ceev, lub zog, qis ablation, thiab zoo heev thermal shock tiv taus, ua rau nws tuaj yeem tiv taus qhov kub hloov pauv ntau zaus thaum lub sijhawm electrolysis txhuas. Lub coefficient thermal nthuav dav qis txo qhov kev puas tsuaj ntawm cov qauv, ua rau lub neej cathode ntev dua.
4. Qhov Loj ntawm Cov Khoom Mechanical thiab Lub Zog
   • Cov Khoom Me Me Uas Nyiam Tshaj: Txo cov hmoov coke kom tiv thaiv kev tawg thaum thauj mus los thiab calcination, kom ntseeg tau tias muaj zog.
   • Feem pua ​​ntawm Calcined Coke: 70% calcined coke yog siv rau hauv cov anodes electrolysis txhuas los txhim kho kev coj ua thiab kev tiv thaiv corrosion.
5. Kev Ua Hluav Taws Xob Siab
   Cov electrodes coke koob muaj peev xwm nqa tau 100,000 A tam sim no, ua tiav kev ua hlau zoo ntawm 25 feeb rau ib lub cub tawg thiab kev coj hluav taws xob siab dua peb zaug dua li cov coke ib txwm muaj, txo qis kev siv hluav taws xob.

III. Cov Ntsiab Lus Tseem Ceeb ntawm Qhov Txawv

IV. Cov Qauv Kev Lag Luam

• Cov Anodes Roj Teeb Lithium-ion: Cov coke tshiab uas muaj cov qauv nuclear (radial texture) thiab cov coke calcined uas hloov kho suab (txhim kho lub neej voj voog ntawm cov pa roj carbon anode) yog cov chaw tshawb fawb tshiab los txhim kho qhov ceev ntawm lub zog thiab kev ua haujlwm ntawm lub voj voog.
• Cov Khoom Siv Aluminium Cathodes: Kev thov ntau ntxiv rau 750 hli loj-loj koob coke electrodes thiab nruab nrab-sulfur coke rau kev sib tsoo silicon carbide yog tsav tsheb kev txhim kho cov khoom siv mus rau kev ua hluav taws xob siab dua thiab kev tiv thaiv kev hnav.