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According to the report of the Physicist Organization Network on February 26th, scientists from Northwestern University and University of Illinois at the United States demonstrated for the first time a stretchable lithium-ion battery. This flexible device can provide power for innovative electronic devices and truly realize electronic devices. Miniaturization and extended integration of power sources. The relevant research report was published in the magazine "Nature and Communications" published on the same day.
This stretchable battery has the same power and voltage as conventional lithium-ion batteries of the same size, but its pliability makes it stretch up to three times its original size without affecting its function and operation. And can be restored to its original size later. Researchers demonstrated the power supply of this type of battery to commercial light-emitting diodes. Even when folded, extended, twisted, and mounted on human elbows, light-emitting diodes can remain operational. The new battery can work continuously for 8 hours to 9 hours before it needs to be charged, and the charging process can also be performed wirelessly. The stretchable electronic device can be used anywhere, even in the human body, but does not need to be connected to the outlet via a power cord. Implantable electronic devices can monitor human brain waves and heart activity, and can work in areas where flat, rigid batteries do not work.
Northwestern University focuses on theoretical aspects and is responsible for design and modeling; University of Illinois at Urbana-Champaign is responsible for the experimental part and the manufacture of new batteries. Designing a wireless power supply can be a challenge in the R&D process. Now scientists have created small, high-performance batteries through smart "space-filling technology." In the past, they often used "pop-up" technology when constructing stretchable circuits. Wires were used as bridges to connect tiny circuit elements together to form an array. When the array was stretched, the wire would pop up and unfold, making it flexible. The circuit is free to bend, flex, and twist. However, the limited space determines that the technology cannot be used between battery modules. Therefore, it is necessary to find another way to manufacture a retractable battery. To this end, scientists use wires to interconnect long, wavy lines to fill tiny spaces between battery assemblies. The lines connected to the elements are in a large "S" shape with numerous small "S" shaped wires in between. When the battery is stretched, the large "S" will be stretched and disappear first, followed by the small "S" It will disappear with stretching, and the connection between 100 parallel electrodes will become more compact. This is the key to the new battery's ability to stretch to three times its size.
The researchers said that the battery's stretching process is reversible and supports wireless charging. In addition, the design of the battery allows the integration of retractable inductive coils to enable charging via an external power source without requiring a physical connection. Experiments have shown that stretchable lithium-ion batteries can be recharged about 20 times, basically not causing damage to the battery capacity. (Zhang Wei Feng Weidong)
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