Tuesday, July 23, 2024

Bringing lithium-sulfur batteries nearer to commercialization – pv journal Worldwide


Researchers on the University of South Carolina have efficiently transferred their extremely steady lithium-sulfur battery expertise from coin to pouch cells and reported succesful vitality densities.

From pv journal EES News

Lithium-sulfur batteries are a promising candidate for high-performance vitality storage purposes attributable to their low price and excessive theoretical vitality density of greater than 500 Wh/kg when mixed with lithium steel anodes.

However, the manufacturing of a extra steady sulfur cathode is difficult attributable to polysulfide shuttling and modifications within the quantity of sulfur that result in chemical and mechanical degradation of the cathode throughout biking.

Researchers on the University of South Carolina have taken a giant step ahead in fixing this challenge by growing a easy electrode processing technique for producing extremely steady sulfur cathodes. These electrodes have a self-structured binder confinement for sulfur particles utilizing solely industrial sulfur, carbon black, and binder, with out extra elements.

The researchers managed the dissolution of the binder in the course of the slurry preparation step to kind a porous binder/carbon shell construction across the sulfur particles that would entice soluble polysulfides and decelerate the curing mechanism. -shuttling.

The sulfur cathodes achieved by way of this technique supply a exceptional capability retention of 74% in 1000 cycles, attributable to a considerable discount in lithium-polysulfide shuttling and lively materials loss. Electrodes with a excessive space cost additionally present wonderful cyclability in addition to a excessive capability.

The researchers reported these outcomes final yr after finishing the primary part of the undertaking, the place they used coin cells. Now, they’re shifting to sensible types of the battery to see if commercialization is feasible.

The staff’s present work focuses on the pouch cell, which theoretically has the very best vitality density as a result of this sort has the least quantity of waste weight. “Pouch cells sometimes have a lighter and thinner battery casing than different kinds, leaving a lot of the battery’s quantity and weight for the elements that present the vitality,” mentioned Chemical Engineering Assistant Professor Golareh Jalilvand. .

As the challenges of batteries develop in measurement, USC researchers report a speedy and profitable transition from coin to pouch cells. “We have achieved distinctive lithium-sulfur pouch cells with excessive vitality densities,” mentioned Jalilvand. “I’m trying ahead to seeing the lengthy life cycle and sturdiness of our pouch cells as a result of that is the ultimate verify mark for us and our trade companion. With that, possibly it is time to say we’ve a lithium-sulfur battery prepared for commercialization.

Due to the lengthy charge-discharge time, the researchers discovered lithium-sulfur batteries to be essentially the most appropriate for purposes that don’t require quick charging. This consists of heavy-duty vehicles, buses, and different modes of transportation that require a protracted discharge time, generally often called milage, and could be parked in a single day at charging stations. The expertise additionally reveals nice potential for stationary purposes resembling grid-level vitality storage in addition to area purposes.

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