A way to make batteries with almost infinite lifetime will be developed

ByAndy Armstrong

MIT and Samsung announced that they developed a solid electrolyte in place of the liquid electrolyte used in current lithium-ion batteries. By this, it is known that the life of the battery extends to "almost infinite", safety is improved, and cold resistance is improved.

Samsung, MIT find way to make batteries with 'indefinite' lifetime - The Korea Times

Going solid-state could make batteries safer and longer-lasting | MIT News

In a lithium ion battery, which is a widely used battery, the electrolyteEthylene carbonate (ethylene carbonate)Or diethyl carbonate is used as an electrolytic solution in which a lithium salt is dissolved, but this organic solvent is easy to burn, so accidents such as ignition occurred.

What was sought there was "Solid Electrolyte" without danger of ignition,In general, the solid electrolyte has a slow charge / discharge rate because the conduction characteristic of lithium ion is not as good as that of an organic solvent systemThere was a problem.

At this time, MIT and Samsung broke down the point that this "solid electrolyte has poor conduction characteristics compared to electrolytic solution" with a superionic lithium ion conductor which is a compound of lithium, germanium, phosphorus and sulfur. MIT's Gerbrand Cede visiting professor who specializes in materials science and engineering says, "Solid has been thought not to have sufficient conduction properties, but that paradigm has been turned over."

This is a diagram showing the crystal structure of the superionic conductor. Lithium atom is drawn in green, sulfur atom is yellow, PS 4 tetrahedron is purple, GeS 4 tetrahedron is blue.


As mentioned above, accidents that ignite with a lithium-ion battery are occurring because lithium is flammable, and organic solvents are easy to burn. By stopping the use of electrolyte and making it solid electrolyte, there is no danger of ignition.

Furthermore, with conventional lithium-ion batteries, the life cycle is about 500 to 1200 times in JIS test. It does not correspond to the number of times of charge and discharge, but if it is made into a solid electrolyte, the cycle will increase to hundreds of thousands, so you can use it almost unlimitedly.

In addition, as a side effect, if you use electrolyte, the performance drops when it gets cold at -20 ℉ (-28.8 ℃), but if it is a solid electrolyte, It is possible to demonstrate performance. in addition,Power densityIt will improve by 20 to 30% compared with the conventional one.

If it is put to practical use "I suddenly exploded when I was charging my smartphone or laptop battery while I was asleepWorry that it will not go away.

in Hardware, Posted by logc_nt