How to extend lifelong life and improve safety

　　Author ：Iflowpower – Portable Power Station Supplier

With the increasing expansion of digital smart equipment and electric car market, lithium metal batteries can be said to be one of the most promising high-density energy storage technology. However, a large barrier in lithium metal battery technology will appear uncontrollable lithium delegra, and thereby causing a problem of deterioration and safety hazards in charging capacity. The lithium branch crystal is a needle that grows from the anode or negative electrode of the battery, which causes harmful side reactions to reduce energy density, serious or even cause a fire or explosion of the electrode short circuit.

A recent research in ArizonaStateUnivers Recently, the use of three-dimensional polyimethylsiloxane (PDMS) layer as a base material of the lithium metal anode in the battery, and can effectively inhibit the formation of lithium dendrites, thereby greatly Extend battery life and reduce safety hazards. The study was published on March 6th in the latest outstanding journal "Natural Energy" (Nature ". This finds that there is meaningful for lithium-ion batteries and lithium-air.

There is also a big meaning for other metal anode batteries. Because almost all metals that use the battery anode, dendrites, such as zinc, sodium and aluminum batteries, etc. Jiang Hanqing said that he and the research team are not solved from the perspective of material or electrochemical, but from the perspective of mechanical engineers to find solutions.

He said that the known studies have shown that tiny tin needles or tin must-have to extend from the surface of tin metal in stress use, so we have studied stress as a lithium branch growth. possibility. In the first round of research, the researchers added a flexible PDMS at the bottom of the battery, and found that the growth of lithium dendrites was significantly reduced.

The analysis of the researchers showed that the stress accumulated in the metal lithium electrode was released in the form of a pleated deformation by the PDMS substrate, and the trend of this dendritic crystal reduction is directly related to this stress release. In addition to studying the growth mechanism of lithium dendrites, Jiang Hanqing team further studied how to use this phenomenon (stress release reduction dendrite growth) to extend lithium metal battery life, while maintaining high energy density. The method proposed by the researchers is to make the PDMS substrate to a three-dimensional structure with a lot of surfaces.

Using a large amount of a large amount of small hole containing a large amount of small holes as a template, PDMS enters the pore in the inner portion of the square sugar, forms a continuous network substrate, and plated a thin layer of copper layer to conduct electronics. Finally, with lithium metal full of these pores. As a porous sponge layer, PDMS can effectively reduce stress and inhibit dendritic growth, Jiang Hanqing explained.

One of the members of the study group, Professor of Mingtang, Riceuniversity, said: By combining with other methods of inhibiting lithium dendrites, such as new electrolyte additives, this discovery is a safe for lithium metal batteries. High density, long-term storage energy solution has a wide range of significance. The potential application range of this technology is very wide, powered from personal electronic devices, and supply long-term power for electric vehicles, and then to the backup power supply for solar grid.

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