Ofufuza ochokera kuYunivesite yaukadaulo ya Munich(TUM) ndiYunivesite ya RWTH Aachenku Germany ayerekeza mphamvu zamagetsi za mabatire a sodium-ion (SIBs) amphamvu kwambiri ndi mphamvu zamagetsi za batire ya lithiamu-ion yapamwamba kwambiri (LIBs) yokhala ndi lithiamu-iron-phosphate (LFP) cathode.

Gululo linapeza kuti momwe magetsi alili komanso kutentha kwake zimakhudza kwambiri kukana kwa kugunda kwa mtima ndi kulephera kwa ma SIB kuposa ma LIB, zomwe zingakhudze kusankha kwa mapangidwe ndipo zikusonyeza kuti ma SIB angafunike njira zamakono zowongolera kutentha ndi magetsi kuti agwire bwino ntchito, makamaka pamlingo wotsika wa magetsi.

• Kuti tifotokoze bwino kukana kwa kugunda kwa mtima: mawuwa amatanthauza kuchuluka kwa mphamvu ya batri yomwe imatsika pamene mphamvu yadzidzidzi ikufunika. Chifukwa chake, kafukufukuyu akusonyeza kuti mabatire a sodium-ion amakhudzidwa kwambiri ndi kuchuluka kwa chaji ndi kutentha kuposa mabatire a lithiamu-ion.

Kafukufuku:

“Mabatire a sodium-ion [SIBs] nthawi zambiri amaonedwa ngati olowa m'malo mwa ma LIBs,” asayansiwo adatero. “Komabe, kusiyana kwa machitidwe a electrochemical a sodium ndi lithiamu kumafuna kusintha pa anode ndi cathode. Ngakhale kuti mabatire a lithiamu-ion [LIBs] nthawi zambiri graphite imagwiritsidwa ntchito ngati zinthu za anode, kwa ma SIBs hard carbon pakadali pano amaonedwa ngati zinthu zabwino kwambiri za ma SIB.”

Anafotokozanso kuti ntchito yawo inali yoti ikwaniritse kusiyana kwa kafukufukuyu, chifukwa pakadalibe chidziwitso chokhudza momwe magetsi amagwirira ntchito pa SIB pankhani ya kutentha kosiyanasiyana ndi momwe magetsi amayendera (SOCs).

Gulu lofufuzali linachita, makamaka, kuyeza magwiridwe antchito amagetsi pa kutentha kuyambira madigiri 10 C mpaka madigiri 45 C ndi kuyeza mphamvu yamagetsi yotseguka ya selo lonse pa kutentha kosiyanasiyana komanso kuyeza theka la maselo ofanana pa madigiri 25 C.

"Kuphatikiza apo, tinafufuza momwe kutentha ndi SOC zimakhudzira mphamvu ya direct current resistance (R DC) ndi galvanostatic electrochemical impedance spectroscopy (GEIS)," inatero. "Kuti tiwone mphamvu yogwiritsidwa ntchito, mphamvu yogwiritsidwa ntchito, komanso kugwiritsa ntchito mphamvu moyenera pansi pa mikhalidwe yosinthasintha, tinachita mayeso a mphamvu ya liwiro pogwiritsa ntchito mitengo yosiyanasiyana ya katundu pa kutentha kosiyanasiyana."

Ofufuzawo anayeza batire ya lithiamu-ion, batire ya sodium-ion yokhala ndi cathode ya nickel-manganese-iron, ndi batire ya lithiamu-ion yokhala ndi cathode ya LFP. Onse atatuwa adawonetsa hysteresis ya voltage, zomwe zikutanthauza kuti voliyumu yawo yotseguka imasiyana pakati pa kuchaja ndi kutulutsa.

"Chochititsa chidwi n'chakuti, kwa ma SIB, hysteresis imachitika makamaka pa ma SOC otsika, zomwe, malinga ndi muyeso wa theka la maselo, mwina chifukwa cha anode yolimba ya carbon," akatswiri adatsimikiza. "R DC ndi impedance ya LIB sizikudalira kwambiri SOC. Mosiyana ndi zimenezi, kwa ma SIB, R DC ndi impedance zimawonjezeka kwambiri pa ma SOC pansi pa 30%, pomwe ma SOC apamwamba amakhala ndi zotsatira zosiyana ndipo zimapangitsa kuti R DC ndi impedance zitsike."

Komanso, adatsimikiza kuti kudalira kutentha kwa R_DC ndi impedance ndikokwera kwambiri kwa ma SIB kuposa ma LIB. "Mayeso a LIB sakuwonetsa kukhudzidwa kwakukulu kwa SOC pakugwira ntchito bwino kwa maulendo obwerera. Mosiyana ndi zimenezi, kuyendetsa ma SIB kuchokera pa 50% mpaka 100% SOC kungachepetse kutayika kwa magwiridwe antchito ndi theka poyerekeza ndi kuyendetsa njinga kuchokera pa 0% mpaka 50%," adafotokozanso, ponena kuti kugwira ntchito bwino kwa ma SIB kumakula kwambiri mukayendetsa maselo m'malo okwera a SOC poyerekeza ndi malo otsika a SOC.