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Rechargeable calcium-ion batteries (CIBs) are promising alternatives for use as post-lithium-ion batteries because of the merits of high theoretical capacity and abundant sources of Ca anode, low redox potential and the divalent electron redox properties of calcium.
Interest in calcium batteries saw a resurgence. There has since been a flurry of studies on anodes, cathodes, and electrolytes for viable calcium batteries. This year, scientists in China have pushed the envelope further by using a novel chemistry approach to rechargeable calcium batteries.
The new work proves that calcium can be a viable competitor to lithium in batteries, Hosein says. “These studies show good performance and nice chemistry, and they’re very exciting.” Batteries store and release energy by moving ions between two electrodes through an electrolyte.
Specifically, calcium batteries need stable electrolyte materials that readily dissolve calcium ions from calcium metal anodes during half of the charge cycle and just as easily put them back into the cathode during the other half. The breakthroughs that rekindled the field in the past decade were based on electrolyte advances.