A team of researchers has developed a battery prototype using salt water and nontoxic materials that can charge in seconds
researchers from the departments of physics and chemistry at Imperial College London have developed a battery prototype using salt water and nontoxic materials that can charge in seconds.
While it can hold less charge than conventional lithium-ion batteries, the prototype, which is made from polymers – long chains of molecules that make up plastics – can charge and discharge in a matter of seconds. As an added benefit of these materials, it also changes color as it charges, giving users an easy way to read out the state of charge of the battery.
Batteries with faster charge time – but lower capacity – could have a range of applications where energy needs to be exchanged quickly, but the batteries don't need to be small.Polymer materials have been successfully used in batteries before, as additives to provide flexibility or as electrolytes that separate positive and negative electrodes, but their effective use as active materials in battery electrodes operating in water has proved difficult in the past.
With this principle, they were able to create positive and negative electrodes that can host their opposite ions from the water – and they had the ingredients for a battery. As the polymer backbones were already flexible – expanding and contracting while the battery charged and discharged – no additives were needed.
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