The future2 May 2020 08:53
https://korii.slate.fr/tech/electricite-stockage-renouvelable-solaire-avenir-batteries-vanadium
In California, a third of the electricity produced is from renewable energy. This state of the American west coast, particularly sunny throughout the year , has been engaged for some time in solar energy.
But California is sometimes a victim of its success, its electrical network no longer being able to store the energy captured from solar panels . In March 2017, after several cloudless days, the state even had to pay its neighbor Arizona to siphon off the surplus.
What is holding back California, like other parts of the world , in its renewable energy efforts is the issue of storage. To date, unable to store electricity long enough and in large quantities, we compensate, especially at night, with fossil fuels.
To solve this problem, scientists have been working on an innovative model of batteries, capable of conserving a lot of energy for an extended period of time, says Wired . They use vanadium , a metal considered to be rare and which today is mainly used as an additive in the production of steel.
The solution is not without flaws. The main thing is big: if you want these batteries to be able to store and distribute a lot of energy, they must be huge.
Each of them is made up of eight tanks of more than 35,000 liters of electrolytic solution and, to avoid leaks, these devices must be placed in concrete pits ready to support thousands of liters.
Immortal batteries
Beyond this difficulty of space, these storage units could well revolutionize the solar energy sector, and thus participate in the reduction of CO 2 emissions .
Thought differently from the classic lithium-ion batteries, which are found among others in smartphones, cars and electric scooters , they have more electrolytes and therefore have greater capacities.
They are also chemically very stable and cannot ignite in the event of overheating, unlike lithium-ion batteries . Better still, vanadium batteries have theoretically infinite lifetimes. Some of their parts may require replacements, but the electrolytic solution never degrades.
It remains to be seen how this new technology will influence the renewable energy sector in the coming years. One thing is certain, the price of vanadium, a crucial material in the steel industry , will be closely monitored. Prices could ignite.