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Time to move beyond lithium batteries: A step toward a better performing battery
Replacing lithium ions with magnesium ions in a battery can make it perform almost twice as better, finds a study.
Each of the lithium ions carries a single positive charge while a magnesium ion has a plus-two charge, the researchers explained.
"Because magnesium is an ion that carries two positive charges, every time we introduce a magnesium ion in the structure of the battery material, we can move twice as many electrons," explained lead researcher Jordi Cabana from the University of Illinois in Chicago.
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We hope that this work will open a credible design path for a new class of high-voltage, high-energy batteries, Cabana added. Every battery consists of a positive and negative electrode and an electrolyte.
The electrodes exchange electrons and ions which are usually of positive charge. Only the ions flow through the electrolyte, which is an electric insulator so as to force the electrons to flow through the external circuit to power the vehicle or device.
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To recharge the battery, the exchange is reversed. But the chemical reaction is not perfectly efficient, which limits how many times the battery can be recharged.
"The more times you can do this back and forth, the more times you will be able to recharge your battery and still get the use of it between charges," Cabana said.
In our case, we want to maximise the number of electrons moved per ion, because ions distort the structure of the electrode material when they go in or leave.
"The more the structure is distorted, the greater the energy cost of moving the ions back, the harder it becomes to recharge the battery," Cabana explained.
Having established that magnesium can be reversibly inserted into electrode material's structure brings us one step closer to a prototype.
Source: IANS
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