The new solid-state lithium battery can be used safely at a high temperature of 100 ℃

by:CTECHi     2021-08-05

Lithium-ion batteries have become popular in people's daily lives (everywhere in electric cars and mobile phones), but researchers are still working to create a safer version. Lithium-ion batteries are well known for their 'small size, large capacityIn order to avoid 'spontaneous combustionResearchers have just given a possible answer. They have created a solid-state lithium-ion battery that can withstand high temperatures of 100°C without catching fire.

The current battery can be used well at 95℃ (203?H) and above.

Even if you don’t have the experience of exposing your phone to the sun, you may recall the high temperature warning on the screen, such as 'please continue to use the phone after it has cooled down.'

This is because the liquid electrolyte in the battery can expand or be ignited at high temperatures. Improper charging and overheating may be one of the reasons for this type of failure.

Although the probability of lithium battery failure is not high, its overall possession in the world is still quite amazing. Of course, you certainly don’t want your iPhone or driving Electric cars have encountered such accidents.

Researchers hope that lithium batteries will become safer. The method can be built-in smart chips to monitor battery health, or replace liquid electrolytes with solid components.

The electrolyte is filled between the positive and negative electrodes, and the solid-state battery is obviously more resistant to high temperatures, although this concept also brings another problem-how to connect Solid-state electrodes and solid-state electrolytes allow charge flow, minimize electrical resistance, and charge time.

Researchers from the Swiss Federal Institute of Technology Zurich have proposed a battery design that claims to have solved this problem. They compared the new battery to a sandwich, where the electrodes are two slices of bread, and the solid electrolyte is the meat of the middle layer.

Garnet is a mineral that forms various gems. It is used as an abrasive material in waterjet cutting and is also known to have the highest conductivity among lithium ions. Of a material.

The team meticulously made such a solid garnet electrolyte to take advantage of its porous surface characteristics. The viscous negative electrode allows it to penetrate into the pores, so that the contact area between the electrode and the electrolyte is very large, which means that the battery can be charged faster.

In the test, the team found that it can withstand high temperatures of 100°C (212°H). Co-author Janvanden Broek said: 'Batteries that use liquid or gel electrolytes cannot withstand such high operating temperatures.'

At the current stage, the best operating temperature of the battery is 95℃ (203?H) and above, which can better promote the movement of lithium ions. As for the application prospects, it is also suitable for deployment in energy storage power plants.

The details of this research have been published in the journal Advanced Energy Materials.

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