Ofufuza ochokera kuTechnical University of Munich(TUM) ndiRWTH Aachen Universityku Germany ayerekeza mphamvu yamagetsi ya mabatire a sodium-ion-ion (SIBs) yamphamvu kwambiri yamphamvu kwambiri ya lithiamu-ion batire (LIBs) yokhala ndi cathode ya lithiamu-iron-phosphate (LFP).

Gululo lidapeza kuti kuchuluka kwa ndalama ndi kutentha kumakhala ndi chikoka chachikulu pa kukana kwa pulse komanso kulepheretsa kwa ma SIB kuposa ma LIB, zomwe zingakhudze zosankha zamapangidwe ndikuwonetsa kuti ma SIB angafunike kuwongolera kutentha kwambiri komanso kasamalidwe ka ndalama kuti akwaniritse magwiridwe antchito, makamaka pamiyezo yotsika mtengo.

• Kufotokozeranso kukana kwa pulse: mawuwa amatanthauza kuchuluka kwa mphamvu ya batri ikatsikira pamene mphamvu yadzidzidzi ikagwiritsidwa ntchito. Chifukwa chake, kafukufukuyu akuwonetsa kuti mabatire a sodium-ion amakhudzidwa kwambiri ndi kuchuluka kwa charger ndi kutentha kuposa mabatire a lithiamu-ion.

Kafukufuku:

"Mabatire a sodium-ion [SIBs] nthawi zambiri amawoneka ngati akulowa m'malo mwa LIBs," asayansi adatero. "Komabe, kusiyana kwa khalidwe la electrochemical ya sodium ndi lithiamu kumafuna kusintha kwa anode ndi cathode.

Iwo adalongosolanso kuti ntchito yawo inali yofuna kudzaza kusiyana kwa kafukufukuyu, popeza padakalibe chidziwitso chokhudza khalidwe lamagetsi la SIBs malinga ndi kutentha kosiyanasiyana ndi ma-state-of-charges (SOCs).

Gulu lofufuzalo lidachita, makamaka, kuyeza kwamagetsi pa kutentha koyambira 10 ° C mpaka 45 ° C ndi kuyeza kwamagetsi otseguka a cell-cell pa kutentha kosiyana komanso kuyeza kwa theka la maselo ofanana ndi 25 C.

"Kuphatikiza apo, tidafufuza momwe kutentha ndi SOC zimakhudzira kukana kwaposachedwa (R DC) ndi galvanostatic electrochemical impedance spectroscopy (GEIS)," idatero. "Kuti tiwone momwe angagwiritsire ntchito mphamvu, mphamvu zogwiritsidwa ntchito, komanso mphamvu zogwiritsira ntchito mphamvu pansi pa zochitika zamphamvu, tinayesa kuyesa mphamvu pogwiritsa ntchito mitundu yosiyanasiyana ya katundu pa kutentha kosiyana."

Ofufuzawo anayeza batri ya lithiamu-ion, batri ya sodium-ion yokhala ndi nickel-manganese-iron cathode, ndi batri ya lithiamu-ion yokhala ndi cathode ya LFP. Onse atatu adawonetsa ma voltage hysteresis, kutanthauza kuti magetsi awo otseguka amasiyana pakati pa kulipiritsa ndi kutulutsa.

"Chochititsa chidwi n'chakuti, kwa ma SIBs, hysteresis imapezeka makamaka pa ma SOCs otsika, omwe, malinga ndi miyeso ya theka la maselo, mwina chifukwa cha carbon anode yolimba," anatsindika ophunzirawo. "R DC ndi kulepheretsa kwa LIB kumasonyeza kudalira pang'ono pa SOC. Mosiyana, kwa ma SIB, R DC ndi zolepheretsa zimawonjezeka kwambiri pa SOCs pansi pa 30%, pamene ma SOC apamwamba amakhala ndi zotsatira zosiyana ndi zomwe zimapangitsa kuti R DC ikhale yotsika komanso zolepheretsa."

Kuphatikiza apo, adazindikira kuti kudalira kutentha kwa R_DC ndi kulepheretsa ndikwambiri kwa ma SIB kuposa ma LIB. "Mayesero a LIB sasonyeza mphamvu yaikulu ya SOC paulendo wobwerera." Mosiyana ndi zimenezi, kuyendetsa njinga za SIBs kuchokera ku 50% mpaka 100% SOC kungachepetse kutayika kwachangu ndi theka laling'ono poyerekeza ndi kupalasa njinga kuchokera ku 0% mpaka 50%, "adalongosolanso kuti mphamvu za SIBs zimakula kwambiri pamene kukwera njinga kwa SOC kutsika kusiyana ndi ma cell angapo.