According to foreign media reports, storing renewable energy is just as important as generating renewable energy. Flow battery is probably one of the most promising methods. Despite many obstacles in improving technology, Harvard engineers have been working for the past few years. Progress in the use of organic liquid flow batteries.
Now the team has tested a new molecule that can achieve the most durable and efficient organic flow battery to date.
The flow battery consists of two liquid electrolytes, stored in an external tank, and piped to the battery as needed. During charging and discharging, they pass electrons back and forth through the membrane in the battery and can be changed by changing the tank and Membranes are sized to adjust their storage capacity and power output. Traditionally, the best results for such batteries come from vanadium and bromine electrolytes dissolved in acid, but these chemicals can be costly and corrosive. Organic alternatives to vanadium The substance was found in the form of a terpenoid.
In 2014, the Harvard team began experimenting with more than 10,000 terpenoids and gradually determined which mites worked best. After that, they replaced bromine with ferrous iron, converted the acid to an alkaline mixture, and then chose to modify it. The molecular structure of organic vitamin B2 is a particularly useful ape. Finally, they adjusted the formulation of a neutral aqueous solution last year.
Now, researchers have transformed a scorpion to create a new type of organic molecule that balances life and performance, creating the most durable and efficient organic flow battery to date. This key ingredient is called ' 3. The Maserah's numerator, named after the longevity chief of the Bible.
'In the previous work, we have demonstrated a long-lived but low-voltage chemical that causes low energy for molecular storage and storage of high energy costs,' said lead author Michael Aziz. 'Now, We have the first chemical with long-term stability and more than one volt, which is often considered the threshold for commercial deployment. I believe it is the first organic flow battery to meet all the technical standards that are actually implemented.
In the test of the molecule, the daily aging rate of 'Masalah' molecules is less than 0.01%, and the aging rate caused by each charge and discharge cycle is less than 0.001%. This means that the annual aging rate is less than 3 %, and can be charged and discharged tens of thousands of times. 'Masalah' also dissolves easily into a weakly alkaline electrolyte. This helps it store more energy and reduce the total cost of the material, because the walls and membranes do not need to be particularly resistant to corrosion. .
'This important work represents a major advancement in low-cost, long-life flow batteries,' said Imre Gyuk, director of energy storage research at the US Department of Energy. 'We need such equipment to allow the grid to absorb more and more environmentally friendly but Variable renewable power generation. '
The study was published in Joule magazine.
