The lithium-ion battery is the most commonly used in electronic devices. But when it comes to the field of renewable energies, its application runs up against cost problems.
Many researchers have proposed solutions that rely on the use of affordable and accessible materials. The most recent discovery comes from Michael Angell, a PhD student at Standford University.
Significant performance
Michael Angell based himself on the work of Professor Hongjie Dai and his assistants in 2015. This Standford team developed an aluminum ion battery using an electrolyte called EMIC (1-ethyl-3-methylimidazolium chloride) . This solution produces a liquid salt or ionic liquid when mixed with aluminum chloride.
In place of the EMIC, the search used urea, a compound present in high percentage in the urine. It must be said that its prototype offers an appreciable performance. It does not have the same capacity as a lithium-ion battery, but the charge and discharge rate is higher. The coulombic yield even reaches 97.7, indicating a long service life.
It should be remembered that urea is 100 times cheaper than the previously used EMIC. While electrolyte is the most expensive part of the battery, it may well be that urine will be used in future technologies for storing electricity from wind turbines or solar plates.
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