Cov kws tshawb nrhiav los ntawmTsev Kawm Ntawv Qib Siab Kev Ua Haujlwm ntawm Munich(TUM) thiabRWTH Aachen Universitynyob rau hauv lub teb chaws Yelemees tau piv qhov kev ua tau zoo ntawm hluav taws xob ntawm cov roj teeb sodium-ion muaj zog heev (SIBs) rau cov roj teeb lithium-ion muaj zog heev (LIBs) uas muaj cov roj teeb lithium-iron-phosphate (LFP) cathode.

Cov pab pawg neeg pom tias lub xeev them thiab qhov kub muaj feem cuam tshuam ntau dua rau qhov tsis kam ntawm lub zog thiab qhov impedance ntawm SIBs dua li LIBs, uas yuav cuam tshuam rau kev xaiv tsim thiab qhia tias SIBs yuav xav tau cov txheej txheem tswj hwm kub thiab them ntau dua kom ua tau zoo dua, tshwj xeeb tshaj yog ntawm cov nqi them qis dua.

• Yuav piav qhia ntxiv txog kev tiv thaiv ntawm lub zog: lo lus no txhais tau tias lub roj teeb hluav taws xob poob qis npaum li cas thaum muaj kev thov fais fab tam sim ntawd. Yog li ntawd, kev tshawb fawb qhia tau tias cov roj teeb sodium-ion raug cuam tshuam ntau dua los ntawm qib them thiab kub dua li cov roj teeb lithium-ion.

Kev Tshawb Fawb:

"Cov roj teeb sodium-ion [SIBs] feem ntau pom tias yog qhov 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 rau cov roj teeb lithium-ion [LIBs] feem ntau graphite yog siv ua cov khoom siv anode, rau SIBs cov roj carbon nyuaj tam sim no pom tias yog cov khoom siv zoo tshaj plaws rau SIBs."

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

Cov pab pawg tshawb fawb tau ua qhov kev ntsuas hluav taws xob ntawm qhov kub thiab txias txij li 10 degrees C txog 45 degrees C thiab kev ntsuas hluav taws xob qhib ntawm lub cell tag nrho ntawm qhov kub sib txawv nrog rau kev ntsuas ib nrab ntawm cov cell sib xws ntawm 25 C.

"Ntxiv mus, peb tau tshawb nrhiav qhov cuam tshuam ntawm qhov kub thiab SOC rau ob qho tib si kev tiv thaiv tam sim no (R DC) thiab galvanostatic electrochemical impedance spectroscopy (GEIS)," nws tau hais tseg. "Txhawm rau tshuaj xyuas lub peev xwm siv tau, lub zog siv tau, thiab kev siv hluav taws xob zoo nyob rau hauv cov xwm txheej dynamic, peb tau ua qhov kev xeem muaj peev xwm los ntawm kev siv cov nqi thauj khoom sib txawv ntawm qhov kub sib txawv."

Cov kws tshawb nrhiav tau ntsuas lub roj teeb lithium-ion, lub roj teeb sodium-ion nrog lub cathode nickel-manganese-iron, thiab lub roj teeb lithium-ion nrog lub cathode LFP. Tag nrho peb lub tau pom tias muaj qhov voltage hysteresis, uas txhais tau tias lawv qhov hluav taws xob qhib-circuit sib txawv ntawm kev them thiab kev tso tawm.

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

Ntxiv mus, lawv tau paub tseeb tias qhov kub thiab txias ntawm R_DC thiab impedance siab dua rau SIBs dua li LIBs. "Cov kev xeem LIB tsis qhia txog qhov cuam tshuam tseem ceeb ntawm SOC rau kev ua haujlwm zoo. Qhov sib txawv, kev caij tsheb kauj vab ntawm SIBs los ntawm 50% txog 100% SOC tuaj yeem txo qhov kev poob haujlwm ntau dua ib nrab piv rau kev caij tsheb kauj vab los ntawm 0% txog 50%, "lawv piav qhia ntxiv, sau tseg tias qhov ua tau zoo ntawm SIBs loj hlob sai heev thaum caij tsheb kauj vab ntawm cov hlwb hauv qhov ntau SOC siab dua piv rau qhov ntau SOC qis dua.