It is expected to replace lithium-ion batteries! US scientists develop new "dream battery"
American scientists published a paper in the latest issue of the "Journal of the American Chemical Society" saying that they have developed a new type of sodium-sulfur battery that solves the problems of dendrites commonly faced by similar batteries and makes the battery life longer - after 300 cycles Charge and discharge are still stable performance. The latest research is an important milestone on the road to commercialization of sodium-sulfur batteries, which are expected to replace the widely used lithium-ion batteries in the future.
: Eðlisfræðingar Organization Network
Lithium-rafhlöður eru nú mikið notaðar í snjallsíma og rafknúin farartæki. Hins vegar eru litíum og kóbalt, hráefni til framleiðslu á litíum-jónarafhlöðum, ekki aðeins takmörkuð í forða, heldur hafa þau einnig ákveðin neikvæð áhrif á umhverfið, þar með talið notkun á miklu magni af grunnvatni, mengun jarðvegs og vatnslinda er kolefnislosun mikil. Efni eins og natríum og brennisteinn eru ódýrari, aðgengilegri (natríum er hægt að fá úr sjónum) og umhverfisvænni. Með þetta í huga hafa vísindamenn unnið að natríum-rafhlöðum sem geta starfað við stofuhita undanfarin 20 ár.
The latest research leader, Professor Arumgan Mantiram, Director of the Materials Institute at the University of Texas at Austin, said: "The sodium and sulfur are abundant, environmentally friendly, and cost-effective, making sodium-sulfur batteries a promising alternative. kind of 'dream battery'."
In two recent studies of sodium batteries by Mantiram's team, the scientists adjusted the composition of the electrolyte to help ions move back and forth between the cathode and anode, stimulating the charging and discharging of the battery. In addition, they have overcome a common problem in sodium batteries -- needle-like dendrites that grow on the battery's anode, causing the battery to rapidly age, short-circuit, and even catch fire and explode.
The researchers explain that in previous sodium-sulfur battery electrolytes, intermediate compounds formed from sulfur would dissolve in the electrolyte and shuttle between the two electrodes within the battery, leading to material loss, component degradation and dendrite formation. The new electrolyte they formulated uses an inert (not involved in chemical reaction) solvent to dilute the concentrated salt solution, thereby keeping the electrolyte in a "semi-dissolved" state. The results show that the new electrolyte can prevent the dissolution of sulfur, thus solving the shuttle and dendrite problems. This allows the battery to last longer, showing stable performance after 300 charge-discharge cycles.
Verð á litíum hefur rokið upp úr öllu valdi síðastliðið ár og ákall um aðra valkosti en litíum-jónarafhlöður hefur orðið háværari. Rannsakendur ætla að byggja á þessari byltingu með því að prófa stærri rafhlöður til að sjá hvort hægt sé að nota þær í rafknúin farartæki og geymslu endurnýjanlegra orkugjafa eins og vind- og sólarorku.
