I-coke kaphethiloli ene-calcined ingahlukaniswa ibe yi-coke ene-sulfur ephezulu, okuqukethwe kwayo kwe-sulfur okungaphezu kuka-3%, kanye ne-coke ene-sulfur ephansi, okuqukethwe kwayo kwe-sulfur okungaphansi kuka-3%. I-coke kaphethiloli ene-calcined esezingeni eliphansi isetshenziswa kakhulu ekuncibilikiseni i-silicon yezimboni nasekukhiqizeni ipulasitiki ye-anode. I-coke ene-sulfur ephezulu ivame ukusetshenziswa njengophethiloli ezitshalweni zesimende nasezitshalweni zikagesi.