Solve potential solutions for rechargeable lithium-ion battery dendride growth

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The research team of Vice Professor, the University of Davis, California, published a new paper in "Science Progress", proposing a potential solution to solve lithium rechargeable lithium battery dendrites. The WAN team proves that ions flowing near the cathode may expand these next-generation rechargeable battery safety and service life. Lithium metal battery uses lithium metal as an anode.

These batteries have high charge densities and may be doubled, but security is a big problem. When they charge, some ions will be reduced to a lithium metal on the surface of the cathode surface and form an irregular tree microstructure, called a dendritic, which may eventually lead to short circuits or even explosion. In theory, the growth of dendritic crystals is caused by competition of quality delivery and lithium ion near the cathode surface.

When the reduction speed of the ion is faster than the mass transfer speed, it produces an electron neutral gap that does not contain ions near the cathode, called a spatial charge layer. It is believed that the instability of this layer can cause dendrites growth, thus reducing or eliminating it may reduce the growth of dendrites, thereby extending battery life. Lithium metal batteries can easily produce metal dendrites, which can cause short circuit or explosion of the battery.

Engineers at the University of California Davis show that ion faults near the cathode can prevent this problem. In this figure, the flow rate of the increased electrode can reduce the growth of dendritic crystals on the surface. The idea of ​​deoxidation is reduced by 99% of WAN is to make ions flow through cathodes in the microfluidic channel to restore charges and make up this gap.

The team outlines its conceptual verification test in the paper, found that this ion stream can reduce the growth of dendrites by 99%. For WAN, this study is exciting because it indicates the effectiveness of using microfluidic technology to battery-related issues, and paved the road for future research in the field. He said: "Through this basic research and microfluidic method, we can quantify the effects of flow on dendrites.

"" There is no many research teams to study this. ". "Although it is impossible to integrate microfluid to actual batteries, the WAN team is looking for other methods to apply the basic principle of this study, and introducing local flow near the surface of the cathode to compensate for cations and eliminate spatial charge layers.

He said: "We are very happy to explore our new application. "We have been in designing the cathode surface to introduce convection. ".