Researchers use crab shells to create new biodegradable batteries with 99.7% efficiency

are widely used as energy storage devices. The market for LIBs is projected to grow from US $30 billion in 2017 to $100 billion in 2025.

"For example, polypropylene and polycarbonate separators, which are widely used in Lithium-ion batteries, take hundreds or thousands of years to degrade and add to environmental burden."the most abundant polymer in nature. It's found in crustaceans' outer shells, including crabs, shrimps, lobsters, insect exoskeletons, and fungal cell walls. Crab shells are a readily available source because they're currently thrown away as food waste.

In the study, researchers used chitosan as a gel electrolyte to make batteries more sustainable and environmentally friendly. Chitosan is naturally broken down by micro-organisms, which means that the battery can simply be buried in the soil at the end of its life span, where it will break down within five months. This leaves behind only zinc, which could be recycled.The challenge with LIBs is sourcing raw materials, mainly lithium and cobalt. This is creating an enormous risk, as the scarce nature of these raw materials could lead to widespread shortages.

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