Abacwaningi abavela ku-I-Technical University yaseMunich(TUM) kanyeI-RWTH Aachen UniversityeJalimane iqhathanise ukusebenza kukagesi kwamabhethri e-sodium-ion (SIBs) ane-high-energy nebhethri ye-lithium-ion yesimanje (LIBs) ene-lithium-iron-phosphate (LFP) cathode.

Ithimba lithole ukuthi isimo sezindleko nezinga lokushisa kunomthelela ophezulu ekuphikiseni ukushaya kwenhliziyo kanye nokuthimbezeleka kwama-SIB kunama-LIB, okungase kube nomthelela ekukhethweni kwedizayini futhi kuphakamise ukuthi ama-SIB angase adinge izinga lokushisa eliyinkimbinkimbi kanye nezinhlelo zokuphatha zokushaja ukuze kuthuthukiswe ukusebenza kahle, ikakhulukazi emazingeni okukhokha aphansi.

• Ukuqhubeka nokuchaza ukumelana nokushaya kwenhliziyo: leli gama libhekisela ekutheni ugesi webhethri wehla kangakanani lapho kusetshenziswa isidingo samandla kungazelelwe. Ngakho-ke, ucwaningo lubonisa ukuthi amabhethri e-sodium-ion athinteka kakhulu ngezinga lokushaja nokushisa kunamabhethri e-lithium-ion.

Ucwaningo:

"Amabhethri e-sodium-ion [ama-SIB] avame ukubonwa njengokuwa esikhundleni sama-LIB," kusho ososayensi. "Noma kunjalo, umehluko ekuziphatheni kwe-electrochemical ye-sodium ne-lithium kudinga ukulungiswa kukho kokubili i-anode ne-cathode. Nakuba kumabhethri e-lithium-ion [LIBs] ngokuvamile i-graphite isetshenziswa njenge-anode material, kuma-SIBs i-hard carbon okwamanje ibonakala njengento ethembisa kakhulu kuma-SIB."

Baphinde bachaza ukuthi umsebenzi wabo uhlose ukuvala igebe ocwaningweni, njengoba kusekhona ukuntula ulwazi mayelana nokuziphatha kukagesi kwama-SIB mayelana namazinga okushisa ahlukahlukene kanye ne-state-of-charges (SOCs).

Ithimba labacwaningi lenze, ikakhulukazi, izilinganiso zokusebenza kukagesi emazingeni okushisa asukela ku-10 degrees C kuya ku-45 degrees C kanye nezilinganiso zamandla kagesi wesekhethi evulekile yeseli eligcwele kumazinga okushisa ahlukene kanye nezilinganiso zengxenye yeseli yamaseli ahambisanayo ku-25 C.

“Ngaphezu kwalokho, siphenye ithonya lokushisa ne-SOC kukho kokubili ukumelana namanje okuqondile (R DC) kanye ne-galvanostatic electrochemical impedance spectroscopy (GEIS),” icacisile. "Ukuze sihlole umthamo ongasebenziseka, amandla asebenzisekayo, kanye nokusebenza kahle kwamandla ngaphansi kwezimo eziguquguqukayo, senze ukuhlola amandla esilinganiso ngokusebenzisa izilinganiso zokulayisha ezihlukene kumazinga okushisa ahlukene."

Abacwaningi balinganise ibhethri ye-lithium-ion, ibhethri ye-sodium-ion ene-nickel-manganese-iron cathode, nebhethri ye-lithium-ion ene-LFP cathode. Bobathathu babonise i-voltage hysteresis, okusho ukuthi i-voltage yabo yomjikelezo ovulekile ihluke phakathi kokushaja nokukhipha.

Kuyathakazelisa ukuthi kuma-SIBs, i-hysteresis iyenzeka ngokuyinhloko kuma-SOC aphansi, okusho ukuthi, ngokwezilinganiso ze-half-cell, cishe ngenxa ye-carbon anode eqinile," kugcizelela izifundiswa. "I-R DC kanye nokubambezeleka kwe-LIB kukhombisa ukuncika okuncane kakhulu ku-SOC. Ngokuphambene, kuma-SIB, i-R DC kanye ne-impedance yenyuka kakhulu kuma-SOC ngaphansi kuka-30%, kuyilapho ama-SOC aphezulu enomthelela ophambene futhi aholela ekwehleni kwe-R DC namanani okuvimbela."

Ngaphezu kwalokho, bathole ukuthi ukuncika kwezinga lokushisa kwe-R_DC kanye ne-impedance kuphezulu kuma-SIB kunama-LIB. "Ukuhlolwa kwe-LIB akubonisi ithonya elibalulekile le-SOC ekusebenzeni kahle kohambo lokuya nokubuya. Ngokuphambene, ukuhamba ngebhayisikili ama-SIBs ukusuka ku-50% kuya ku-100% SOC kunganciphisa ukulahlekelwa kokusebenza kahle ngaphezu kwesigamu uma kuqhathaniswa nokuhamba ngebhayisikili kusuka ku-0% kuya ku-50%," bachaza ngokuqhubekayo, bephawula ukuthi ukusebenza kahle kwama-SIBs kukhula kakhulu uma kuqhathaniswa nama-SOC ububanzi uma kuqhathaniswa nobubanzi obuphezulu be-SOC ebangeni.