According to a report on the Hong Kong Ming Pao website, wearable electronic products that have become popular in recent years, such as heated jackets and insoles, require the use of lithium batteries. However, lithium batteries are hard and can make users feel uncomfortable. The Department of Textiles and Clothing of the Hong Kong Polytechnic University (PolyU) has developed an ultra-soft "fabric lithium battery" that can be folded and bent to a diameter of about 1 mm and can be folded repeatedly 1,000 times without loss of performance. The team hopes that the "fabric lithium battery" can be used in the future For smart watch straps, heating clothing, etc., the products are comfortable to wear and more durable. A team from the Department of Textiles and Clothing of the Hong Kong Polytechnic University spent three years developing a foldable fabric lithium battery. Zheng Zijian, professor of the Department of Textiles and Clothing at PolyU, said that the team spent three years to develop the fabric lithium battery. The principle is to use polymer-assisted metal deposition method to evenly deposit highly conductive metals on treated fabrics, such as cotton and carbon. Cloth, "makes materials conductive", replaces the metal foil on the surface of general lithium batteries to act as a current collector and improve softness. Zheng Zijian said that fabrics are smaller and thinner than traditional lithium batteries, with a thickness of less than 0.5 mm. He gave an example, because fabric lithium batteries can be folded and bent, and are suitable for making smart watch straps, which can increase the power storage of smart watches and make the product more durable. "In the past, these smart watches were fully charged for one day. In the future, with the addition of watch straps made of lithium batteries, they can be used for up to two days before running out of power," Zheng Zijian said.

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