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Holistic cell design leads to high-performance, long cycle-life Li/S battery

         

Nov. 19, 2013 — Researchers on the U.S. Division of Vitality’s Lawrence Berkeley Nationwide Laboratory (Berkeley Lab) have validated within the laboratory a lithium-sulfur (Li/S) battery that has greater than twice the particular vitality of lithium-ion batteries, and that lasts for greater than 1,500 cycles of cost-discharge with minimal decay of the battery’s capability. That is the longest cycle existence stated thus far for any lithium-sulfur battery.

A schematic of a lithium-sulfur battery with SEM picture of silicon-graphene oxide subject matter.

Demand for prime-efficiency batteries for electrical and hybrid electrical automobiles able to matching the diversity and energy of the combustion engine encourages scientists to enhance new battery chemistries that might ship extra energy and vitality than lithium-ion batteries, at the moment the most effective performing battery chemistry available on the market.

For electrical automobiles to have a 300-mile vary, the battery will have to present a cell-stage explicit power of 350 to four hundred Watt-hours/kilogram (Wh/kg). This could require virtually double the particular power (about 200 Wh/kg) of present lithium-ion batteries. The batteries would additionally want to have as a minimum 1,000, and ideally 1,500 cost-discharge cycles with out exhibiting a significant energy or vitality storage capability loss.

“Our cells may just present a considerable chance for the advance of zero-emission automobiles with a riding vary just like that of fuel automobiles,” says Elton Cairns, of the Environmental Power Applied sciences Division (EETD) at Berkeley Lab.

The battery at first confirmed an estimated cell-particular vitality of greater than 500 Wh/kg and it maintained it at >300 Wh/kg after 1,000 cycles — so much greater than that of presently to be had lithium-ion cells.

The staff is now looking for enhance for the persevering with construction of the Li/S cell, together with greater sulfur utilization, operation underneath excessive prerequisites, and scale-up. Partnerships with business are being sought. The following steps within the building are to additional elevate the cell power density, toughen cell efficiency below excessive stipulations, and scale as much as higher cells.

The consequences have been pronounced within the journal Nano Letters, in a paper authored via Min-Kyu Music (Molecular Foundry, Berkeley Lab), Yuegang Zhang (Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese language Academy of Sciences) and Cairns (Environmental Vitality Applied sciences Division, Berkeley Lab). The analysis used to be funded with the aid of the U.S. Division of Vitality’s Place of job of Science and a College of California Proof of Thought Award.