Kodi mfundo zazikulu zomwe zimafunika pa mndandanda wa coke ya petroleum yokhala ndi graphitized m'magawo osiyanasiyana ogwiritsira ntchito (monga ma anode a lithiamu batri ndi ma cathode a aluminiyamu) ndi ziti?

Zofunikira za Divergent Index za Graphitized Petroleum Coke m'magawo awiri ofunikira ogwiritsira ntchito: Lithium-ion Battery Anodes ndi Aluminium Cathodes

Zofunikira pa index ya petroleum coke yokhala ndi graphitized zikuwonetsa kusiyana kwakukulu pa kapangidwe ka mankhwala, kapangidwe ka thupi, ndi magwiridwe antchito a electrochemical m'ma anode a batri a lithiamu-ion ndi ma cathode a aluminiyamu. Zofunikira zazikulu zafotokozedwa motere:

I. Ma Batri a Lithium-ion Anode: Magwiridwe Amagetsi a Electrochemical ngati Pakati, Ndi Kukhazikika Kwakapangidwe Komwe Kumaganiziridwa

1. Sulfure Yochepa (<0.5%)
   Zotsalira za sulfure zimatha kuyambitsa kupindika ndi kufalikira kwa kristalo panthawi ya graphitization, zomwe zimapangitsa kuti electrode isweke. Kuphatikiza apo, sulfure imatha kutulutsa mpweya kutentha kwambiri, kuwononga filimu ya solid electrolyte interphase (SEI) ndikupangitsa kuti mphamvu yake isasinthe. Mwachitsanzo, GB/T 24533-2019 imafuna kuwongolera mwamphamvu kuchuluka kwa sulfure pa graphite yomwe imagwiritsidwa ntchito mu ma anode a batri a lithiamu-ion.
2. Phulusa Lochepa (≤0.15%)
   Zonyansa zachitsulo zomwe zili mu phulusa (monga sodium, iron) zimapangitsa kuti electrolyte iwonongeke, zomwe zimafulumizitsa kuwonongeka kwa batri. Zonyansa za sodium zingayambitsenso kusungunuka kwa anode mu uchi, zomwe zimachepetsa nthawi yozungulira. Graphite yoyera kwambiri imafuna njira "yokwera katatu" (kutentha kwambiri, kuthamanga kwambiri, zopangira zoyera kwambiri) kuti muchepetse kuchuluka kwa phulusa pansi pa 0.15%.
3. Makonzedwe Apamwamba a Crystallinity ndi Oriented
   • Kuchuluka Kwambiri Koona: Kumawonetsa kristalo ya graphite; kuchuluka kwakukulu koona kumaonetsetsa kuti njira zoyendetsera bwino zoyika/kutulutsa lithiamu-ion, zomwe zimapangitsa kuti liwiro lizigwira ntchito bwino.
   • Koefficient Yokulitsa Kutentha Kochepa: Needle coke, yokhala ndi kapangidwe kake ka ulusi, imawonetsa koefficient yokulitsa kutentha kotsika ndi 30% kuposa sponge coke, zomwe zimachepetsa kukula kwa voliyumu panthawi ya charge/discharge (monga, anisotropic graphite imakula motsatira C-axis, zomwe zimapangitsa kuti batire itukuke).
4. Kukula kwa Tinthu Toyenera ndi Malo Enaake Omwe Ali Pamwamba
   • Kugawa Tinthu Tambiri: Magawo a D10, D50, ndi D90 okonzedwa bwino amathandiza tinthu tating'onoting'ono kudzaza mipata pakati pa tinthu tating'onoting'ono, zomwe zimapangitsa kuti tinthu tating'onoting'ono tizikhala bwino (kuchuluka kwa tinthu tating'onoting'ono kumawonjezera katundu wogwiritsidwa ntchito pa voliyumu iliyonse, ngakhale kuti kuchuluka kwambiri kwa tinthu tating'onoting'ono kumachepetsa kunyowa kwa ma electrolyte).
   • Malo Okhazikika Okhazikika: Malo okhazikika okhazikika (>10 m²/g) amafupikitsa njira zosamukira za lithiamu-ion, zomwe zimawonjezera magwiridwe antchito, koma zimakulitsa malo a filimu ya SEI, ndikuchepetsa mphamvu yoyambira ya coulombic (ICE).
5. Kugwiritsa Ntchito Bwino Kwambiri Koyambirira kwa Coulombic (≥92.6%)
   Kuchepetsa kugwiritsa ntchito lithiamu panthawi yopanga SEI panthawi yoyamba yochaja/kutulutsa mpweya ndikofunikira kwambiri kuti pakhale mphamvu zambiri. Miyezo imafuna mphamvu yoyambira yotulutsa mpweya ≥350.0 mAh/g ndi ICE ≥92.6%.

II. Ma Cathode a Aluminium: Kuyendetsa ndi Kukana Kutentha kwa Kutentha monga Zofunika Kwambiri

1. Kulamulira kwa Sulfure Yoyenera
   • Coke ya sulfure yochepa (S < 0.8%): Imagwiritsidwa ntchito mu ma electrode apamwamba a graphite kuti mpweya wopangidwa ndi sulfure udzitseke komanso kusweka panthawi yopanga zitsulo, kuchepetsa kugwiritsidwa ntchito kwa chitsulo pa tani imodzi (monga, kampani imodzi inachepetsa kugwiritsidwa ntchito kwa anode ndi 12% pogwiritsa ntchito coke ya sulfure yochepa).
   • Coke yapakati-sulfure (S 2%–4%): Yoyenera ma anode a aluminiyamu a electrolysis, kulinganiza mtengo ndi magwiridwe antchito.
2. Kulekerera Phulusa Kwambiri (ndi Kulamulira Kokha Zodetsa)
   Kuchuluka kwa vanadium mu phulusa kuyenera kukhala ≤0.03% kuti tipewe kuchepa kwa mphamvu ya aluminiyamu mu electrolysis current. Kuipa kwa sodium kumafuna kulamulira mwamphamvu kuti tipewe kusungunuka kwa anode mu uchi.
3. Kulimba Kwambiri kwa Makristalo ndi Kukana Kugwedezeka kwa Kutentha
   Needle coke ndi yabwino kwambiri chifukwa cha kapangidwe kake ka ulusi, komwe kamapereka kukhuthala kwakukulu, mphamvu, kutsika kwa ablation, komanso kukana kutentha kwambiri, zomwe zimathandiza kuti ipirire kusinthasintha kwa kutentha nthawi zambiri panthawi ya electrolysis ya aluminiyamu. Kuchuluka kwa kutentha kochepa kumachepetsa kuwonongeka kwa kapangidwe kake, ndikuwonjezera nthawi ya moyo wa cathode.
4. Kukula kwa Tinthu ndi Mphamvu ya Makina
   • Tinthu Tomwe Timakonda Kutupa: Timachepetsa kuchuluka kwa ufa wa coke kuti tisasweke panthawi yonyamula ndi kusungunuka kwa calcium, zomwe zimapangitsa kuti makina azikhala olimba.
   • Kuchuluka Kwambiri kwa Calcined Coke: 70% calcined coke imagwiritsidwa ntchito mu aluminiyamu electrolysis anodes kuti iwonjezere mphamvu yamagetsi ndi kukana dzimbiri.
5. Mphamvu Yamagetsi Yaikulu
   Ma electrode a singano coke amatha kunyamula mafunde a 100,000 A, zomwe zimapangitsa kuti ntchito yopanga zitsulo ikhale yabwino kwa mphindi 25 pa ng'anjo iliyonse komanso kuti conductivity ikhale yokwera katatu kuposa coke wamba, zomwe zimachepetsa kwambiri kugwiritsa ntchito mphamvu.

III. Chidule cha Kusiyana Kwakukulu

IV. Zochitika Zamakampani

• Ma Batri a Lithium-ion: Ma Coke atsopano okhala ndi nucleus (mawonekedwe a radial) ndi coke wosinthidwa wa pitch-modified calcined (wowonjezera moyo wa cycle ya anode ya carbon hard) ndi malo ofufuzira omwe akutuluka kuti apititse patsogolo kuchuluka kwa mphamvu ndi magwiridwe antchito a cycle.
• Ma Cathode a Aluminium: Kufunika kwakukulu kwa ma electrode akuluakulu a needle coke a 750 mm ndi medium-sulfur coke operera silicon carbide kukupangitsa kuti zinthu zipangidwe bwino kuti zikhale ndi mphamvu yoyendetsa bwino magetsi komanso kukana kuwonongeka.