A breakthrough on dendrites made by MIT researchers may finally open the way to the building of a new type of rechargeable lithium battery
A breakthrough regarding dendrites made by MIT researchers may finally open the way to the building of a new type of rechargeable lithium battery that is safer, lighter, and more compact than existing models, a concept that has been pursued by labs all over the world for years.
The volume of the electrodes changes as a result of the ions’ back-and-forth movement. The solid electrolyte, which must keep complete contact with both electrodes it is sandwiched between, is necessarily stressed as a result. Fincher created a method of creating thin cells using a transparent electrolyte, allowing the entire process to be immediately watched and recorded. The process of dendrite creation typically takes place deep within the opaque materials of the battery cell and cannot be observed directly.
The material was bent into a beam shape with a weight at one end for the tests, and the pressure was produced by bending the material. However, they assert that there may be a variety of techniques to generate the required stress in reality. As in certain thermostats, the electrolyte could, for instance, be created using two layers of material with varying rates of heat expansion, resulting in an inherent bending of the material.
What is needed instead is pressure along the plane of the plates, as if the sandwich were being squeezed from the sides. “What we have shown in this work is that when you apply a compressive force you can force the dendrites to travel in the direction of the compression,” Fincher says, and if that direction is along the plane of the plates, the dendrites “will never get to the other side.”
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