Revolutionizing Energy Storage: The Resurgence of Calcium
Learn about the latest advancements in calcium-based batteries, a promising sustainable alternative to lithium-ion technology.
Calcium is environmentally benign, mitigating concerns over toxicity. Calcium batteries are one of many candidates to replace lithium-ion battery technology. It is a multivalent battery. Key advantages are lower cost, earth abundance (41,500 ppm), higher energy density, high capacity and high cell voltage, and potentially higher power density.
A calcium sulfur (CaS) battery has theoretical energy densities of 3202 Wh/L and 1835 Wh/kg, versus 2800 Wh/L for Li//S. Calcium batteries offer promising performance, safety, and sustainability compared to other prevalent battery technologies, such as lithium, sodium, magnesium, aluminum, potassium, and zinc.
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.
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.
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