Anybody who has ever enjoyed fresh crab legs or lobster tails can attest to how difficult it is to get through their tough shells. But instead of just throwing them away, researchers are “upcycling” these shells into porous, carbon-filled materials with a wide variety of uses. Now, a team reporting in ACS Omega has used this “crab carbon” to create anode materials for sodium-ion batteries—an up-and-coming competitor to lithium-ion chemistries.
Lithium-ion batteries have become ubiquitous in recent years, powering phones, cars and even toothbrushes. But because the amount of lithium metal in the world is limited, some researchers have turned their attentions to its “chemical cousins” instead. Previously, researchers created a biodegradable zinc-ion battery using the chitin in crab shells. But these wastes could alternatively be turned into “hard carbon,” a material that has been explored as a possible anode for sodium-ion batteries.
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