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With times of research and development, Lithium-ion batteries are applied to our daily electronics and increasingly gain great popularity nowadays. Recently, an ultrasound device was designed to improve lithium battery capacity and charging time.
According to the latest news, the researcher at the University of California San Diego developed an ultrasound-emitting device that brings lithium metal batteries, one step closer to commercial viability. It is reported that the device can be used in any battery, regardless of chemistry. The devices which generate sound waves at extremely high frequencies that range from 100 million to 10 billion hertz, are used to filter the wireless cellular signal and identify and filter voice calls and data in a phone, while researchers used them to generate a current in the battery's electrolyte.
Credit: David Baillot/University of California San Diego
With respect to the improvement of battery performance, instead of finding an ideal chemistry to improve the battery performance, the researchers at the University of California San Diego aim to solve a basic issue in the traditional metal batteries-- the static electrolyte liquid between the cathode and anode. The study reported that traditionally, the lithium is more likely to deposit unevenly on the anode because the lithium-ion electrolyte is used up when charging. And this in turn makes the development of needle-like structures called dendrites occurs, which can grow unchecked from the anode towards the cathode, leading to the short circuit of battery and even catch fire. What's worse, rapid charging will speed up this situation further. The UC San Diego team worked out a new idea responding to the question on static electrolyte liquid , the researchers developed the ultrasound devices that can create a flow in the electrolyte. This device replenishes the lithium in the electrolyte and makes it more likely that the lithium will form uniform, dense deposits on the anode during charging. The battery dendrites, which refer to the formation of lithium metal growths during charging that cause performance reduction and short circuits in the lithium metal batteries can be prevented.
"Advances in smartphone technology are truly what allowed us to use ultrasound to improve battery technology," said James Friend, a professor of mechanical and aerospace engineering at the Jacobs School of Engineering at UC San Diego and the study's corresponding author. Researchers showed that a lithium metal battery equipped with the device could be charged and discharged for 250 cycles and a lithium-ion battery for more than 2000 cycles. The batteries were charged from zero to 100 percent in 10 minutes for each cycle. This work allows for fast-charging and high energy batteries all in one, it is exciting in the development of lithium-ion technology.
The research was published in the journal Advanced Materials.
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