Cov kws tshawb nrhiav los ntawmTechnical University ntawm Munich(TUM) andRWTH Aachen UniversityNyob rau hauv lub teb chaws Yelemees tau muab piv cov hluav taws xob kev ua tau zoo ntawm high-zog sodium-ion roj teeb (SIBs) mus rau lub xeev-of-the-art high-zog lithium-ion roj teeb (LIBs) nrog ib tug lithium-iron-phosphate (LFP) cathode.

Pab pawg tau pom tias lub xeev-ntawm-tus nqi thiab qhov kub thiab txias muaj kev cuam tshuam ntau dua ntawm cov mem tes tsis kam thiab impedance ntawm SIBs dua li LIBs, uas tuaj yeem cuam tshuam cov kev xaiv tsim thiab qhia tias SIBs yuav xav tau qhov kub thiab txias ntau dua thiab cov kev tswj hwm them nqi kom ua tau zoo, tshwj xeeb tshaj yog nyob rau theem qis dua.

• Los piav qhia txog kev tiv thaiv mem tes ntxiv: lo lus hais txog ntau npaum li cas lub roj teeb hluav taws xob poob thaum lub zog xav tau tam sim ntawd. Yog li, kev tshawb fawb qhia tias cov roj teeb sodium-ion muaj kev cuam tshuam ntau dua los ntawm kev them nqi thiab qhov kub thiab txias tshaj lithium-ion roj teeb.

Kev tshawb fawb:

"Sodium-ion roj teeb [SIBs] feem ntau pom tias yog kev hloov pauv rau LIBs," cov kws tshawb fawb tau hais. "Txawm li cas los xij, qhov sib txawv ntawm tus cwj pwm electrochemical ntawm sodium thiab lithium xav tau kev hloov pauv ntawm ob qho tib si anode thiab cathode. Thaum lub lithium-ion roj teeb [LIBs] feem ntau graphite yog siv los ua cov khoom siv anode, rau SIBs nyuaj carbon tam sim no pom tias yog cov khoom pheej yig tshaj plaws rau SIBs."

Lawv kuj tau piav qhia tias lawv txoj haujlwm yog npaj los ua kom muaj qhov sib txawv hauv kev tshawb fawb, vim tias tseem tsis muaj kev paub txog kev coj tus cwj pwm hluav taws xob ntawm SIBs ntawm qhov sib txawv ntawm qhov kub thiab txias ntawm lub xeev (SOCs).

Pab pawg tshawb fawb tau ua, tshwj xeeb, kev ntsuas hluav taws xob ntawm qhov kub ntawm 10 ° C mus rau 45 ° C thiab qhib qhov hluav taws xob ntsuas hluav taws xob ntawm tag nrho cov xov tooj ntawm qhov kub sib txawv nrog rau kev ntsuas ib nrab ntawm cov xov tooj sib txuas ntawm 25 C.

"Tsis tas li ntawd, peb tau tshawb xyuas qhov ntsuas kub thiab SOC ntawm ob qho tib si ncaj qha tam sim no tsis kam (R DC) thiab galvanostatic electrochemical impedance spectroscopy (GEIS), "nws tau teev tseg. "Yuav tshuaj xyuas lub peev xwm siv tau, siv tau lub zog, thiab kev siv hluav taws xob nyob rau hauv cov xwm txheej zoo, peb tau ua qhov kev ntsuas muaj peev xwm los ntawm kev siv cov nqi sib txawv ntawm qhov sib txawv."

Cov kws tshawb fawb tau ntsuas lub roj teeb lithium-ion, roj teeb sodium-ion nrog nickel-manganese-hlau cathode, thiab roj teeb lithium-ion nrog LFP cathode. Tag nrho peb qhov pom qhov hluav taws xob hysteresis, txhais tau tias lawv qhov hluav taws xob qhib qhov hluav taws xob sib txawv ntawm kev them nyiaj thiab tawm.

"Qhov zoo siab, rau SIBs, hysteresis feem ntau tshwm sim ntawm qis SOCs, uas yog, raws li kev ntsuas ib nrab ntawm tes, yuav yog vim muaj cov pa roj carbon monoxide nyuaj," cov kws tshawb fawb tau hais. "R DC thiab impedance ntawm LIB qhia me ntsis kev vam khom rau SOC. Hauv qhov sib piv, rau SIBs, R DC thiab impedance nce siab ntawm SOCs qis dua 30%, thaum SOCs siab dua muaj qhov cuam tshuam thiab ua rau qis R DC thiab impedance tus nqi."

Ntxiv mus, lawv paub tseeb tias qhov kub ntawm R_DC thiab impedance siab dua rau SIBs dua li LIBs. "Kev ntsuam xyuas LIB tsis qhia qhov cuam tshuam loj ntawm SOC ntawm kev ua haujlwm mus ncig ua haujlwm. Hauv kev sib piv, kev caij tsheb kauj vab SIBs los ntawm 50% mus rau 100% SOC tuaj yeem txo qis kev ua haujlwm tau ntau dua li ib nrab piv rau kev caij tsheb kauj vab los ntawm 0% mus rau 50%, "lawv piav ntxiv, nco ntsoov tias kev ua haujlwm ntawm SIBs loj hlob zuj zus thaum caij tsheb kauj vab ntau dua SOC.