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July 19, 2019 02:03 am

Startup Aims To Tackle Grid Storage Problem With New Porous Silicon Battery

New submitter symgym writes: Recently out of stealth mode is a new battery technology that's printed on silicon wafers (36 million "micro-batteries" machined into 12-inch silicon wafers). It can scale from small devices to large-scale grid storage and promises four times the energy density of lithium-ion batteries for half the price. There should also be no issues with fires caused by dendrite formation. "When you use porous silicon, you get about 70 times the surface area compared to a traditional lithium battery... [and] there's millions of cells in a wafer," says Christine Hallquist of Cross Border Power, the startup that plans to commercialize the battery design developed by Washington-based company XNRGI. "It completely eliminates the problem of dendrite formation." If all of this is true, it's a massive disruptive invention. Hallquist also notes that the new batteries are 100% recyclable. "At the end of the life of this product, you bring the wafers back in, you clean the wafer off, you reclaim the lithium and other materials. And it's essentially brand new. So we're 100 percent recyclable." "Hallquist says the battery banks that Cross Border Power plans to sell to utility companies as soon as next year will be installed in standard computer server racks," reports IEEE Spectrum. "One shipping container worth of those racks (totaling 40 racks in all) will offer 4 megawatts (MW) of battery storage capacity, she says. Contrast this, she adds, to a comparable set of rack-storage lithium ion batteries which would typically only yield 1 MW in a shipping container."

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