Kle a pou elimine akimilasyon dendrit nan anod batri ityòm-ion - eksplwate efè chofaj pwòp tèt ou-nan batri a.
Batri rechargeable ityòm-ion yo se batri prensipal yo itilize nan elektwonik konsomatè yo, epi yo de pli zan pli vin batri chwa pou machin elektrik ak aplikasyon pou depo enèji nan griy la. Elektwòd pozitif (katod) se oksid metal ityòm, ak elektwòd negatif (anod) se grafit. Men, syantis yo pa te abandone batri ityòm metal ak pi gwo dansite enèji, epi yo san pran souf ap eseye jwenn yon fason soti pou pi pwisan ityòm metal pil.
Researchers at the Rensselaer Polytechnic Institute have now found a way to use the thermal energy inside the battery to diffuse dendrites into a smooth layer, or as study leader Nikhil Koratkar, a professor in the Department of Materials Science and Engineering, says, dendrites can "Repair in place" through the self-heating effect of the battery, the paper was published in the journal "Science".
Batri a fondamantalman konpoze de yon katod, yon anod, yon elektwolit, ak yon separateur. Se separasyon an ki sitiye ant de elektwòd yo pou anpeche batri a soti nan kout -sikwi akòz kontak youn ak lòt. Anplis de sa, porositë yo nan séparateur a plen ak elektwolit yo se iyon (chaje atòm) navèt ant elektwòd yo. chanèl, plis elektwolit absòbe pa séparateur a, pi wo konduktiviti iyonik la.
Lè batri a egzeyate, iyon ityòm ki chaje pozitivman sou anod la transfere nan katod la pou jenere elektrisite; lè batri a chaje, iyon yo ityòm koule soti nan katod la tounen nan anod la, ak batri a ak metal ityòm kòm anod la se tendans metal la ityòm kòm anod la pandan chaj la repete ak pwosesis egzeyat. Inegal depoze pou fòme dendrites, sa yo buildups ekzamp ka evantyèlman penetre séparateur a epi rive nan katod la, kout deyò selil la ak poze yon risk eksplozyon dife.
Sèvi ak grafit kòm anod la, ki evite pwoblèm nan dendrit ityòm, se pi bon opsyon batri kounye a, men byento, yo ka pa kapab kenbe ak bezwen kapasite depo.
To make lithium metal batteries thrive, the researchers' proposed solution is to use the battery's internal resistive heating to eliminate dendrite buildup. Resistive heating (also known as Joule heating) is a process in which a metallic material resists an electric current and thus generates heat. This "self-heating" effect can occur through the process of charging and discharging.
Therefore, the researchers enhanced the self-heating effect by increasing the current density (charge-discharge rate) of the battery, and found that this process can allow the dendrites to diffuse evenly and smoothly to achieve a "healing" effect. The same results were also obtained in the lithium-sulfur battery experiment. Therefore, when the battery is not in use, the "self-healing" effect of the battery can be achieved by charging and discharging at a high rate for several cycles.
Rechèch la son pwomèt. Chaje suralimante ka rajenisman batri a, anpeche sikui kout ki te koze pa dendrit, epi asire ke batri a pi an sekirite epi li gen yon dansite enèji segondè, men èske sa a anpeche batri a dekonpoze rapidman? Petèt ekip la mande plis rechèch.
