Folding Lithium Battery - Is It Serious?

- Aug 16, 2019-

I am afraid that no industry can be compared with the electronics industry. The development of electronic products is beyond imagination. For example, the screen folding mobile phone has been the eye of the consumer since its appearance.

In recent years, everyone seems to be more enthusiastic about the development and use of folding products. For example, the more popular wearable electronic products on the market, such as heating jackets, insoles, bracelets, etc., can be folded. When it comes to electronic products, we can't help but say lithium batteries. The above-mentioned wearable electronic products are inseparable from the service of lithium batteries. What we are going to discuss today is a newly developed lithium battery, a "folded lithium battery."

In the past, the lithium batteries that we used in electronic products generally have a relatively hard texture, which makes people feel uncomfortable. In response to this shortcoming of lithium batteries, the Department of Textiles and Clothing of the Hong Kong Polytechnic University recently developed an ultra-soft "library lithium battery".

It is understood that this "fabric lithium battery" developed by PolyU can be folded and bent to a diameter of about 1 mm, the energy density is as high as 450 watt-hours / liter, the softness is excellent, and the folding is repeated 1000 times without loss of performance. A typical bendable lithium battery can only be bent to a radius of about 25 mm and has a performance of only 200 watt-hours per liter. According to the research and development team, this "fabric lithium battery" can be applied to smart watch straps, hot clothes, etc., and the products are more comfortable to wear and more durable.

The research team used Polytech's patented polymer-assisted metal deposition method to uniformly deposit highly conductive metal copper and nickel on treated fabrics, such as cotton and carbon cloth, to make conductive fabrics, replacing the surface of ordinary lithium batteries. Metal foil to act as a current collector and improve softness.

The deformation test conducted by the team proved that the fabric lithium battery has high mechanical stability, durability and safety. The battery is repeatedly folded in half, twisted at different angles, and irregularly wrinkled, and the voltage performance is not damaged. The safety tests such as continuous hammering, shearing and steel needle puncture prove that the battery can provide stable power for electronic components, and There is a risk of fire or bursting.

According to Zheng Zijian, a professor of the Department of Textiles and Clothing at the Hong Kong Polytechnic University, the development of this fabric lithium battery took a full three years to complete. The principle is to use a polymer-assisted metal deposition method to uniformly deposit a highly conductive metal on a treated fabric, such as cotton and carbon cloth, "to make the material conductive", replacing the metal foil on the surface of a general lithium battery to act as a metal foil. Collect fluid and increase softness.

Professor Zheng Zijian also introduced that fabric lithium batteries are small and thin compared to traditional lithium batteries, and the thickness is less than 0.5 mm. In the past, smart watches, hot clothes and other smart products were fully charged for only one day, but if they were made of fabric lithium batteries, they could be charged for up to 2 days.

In addition to providing a stable, durable and safe energy supply for wearable electronics, fabric lithium batteries can also be used in a variety of areas and areas such as medical health monitoring and smart textiles. According to this trend, the daily generalization of "fabric lithium batteries" may be just a matter of time.