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New Materials: The Scientific Research Team Of Fudan University Has Made New Breakthroughs In The Research Of High-Performance Fiber Batteries And Battery Fabrics

2024/4/28 13:39:00 0

　　 A soft and breathable garment can not only store energy, but also conveniently power mobile phones, watches and other portable electronic devices. This scene once existed in science fiction has become a reality.

　　 Recently, the scientific research team of Fudan University made a new breakthrough in the research of high-performance fiber batteries and battery fabrics: through the design of fiber electrodes with pore structure, the effective combination of electrodes and polymer gel electrolytes was achieved. The team not only solved the problem of poor stability of the interface between polymer gel electrolytes and electrodes, but also developed a continuous construction method of fiber batteries, The large-scale preparation of fiber battery with high safety and high energy storage performance is realized. Relevant research results were published in the main journal of Nature.

On April 22, researchers from Fudan University demonstrated that mobile phones can be charged on fabrics woven with fiber batteries. Photographed by Xinhua News Agency reporter Liu Ying

　　 After years of exploration, the team of Fudan University has successively overcome the two major problems of "designing fiber structure to obtain soft lithium-ion batteries" and "preparing high energy density fiber lithium-ion batteries"; "Achieving high safety fiber lithium-ion battery" is the "last mile" of the subject. Peng Huisheng, the head of the scientific research team and academician of the Chinese Academy of Sciences, said that because the fabric of the fiber battery is closely attached to the human body, it is necessary to replace the leaky and flammable organic electrolyte with a high safety polymer gel electrolyte. The fiber battery based on polymer gel electrolyte needs to improve its energy storage performance, The problem of unstable interface between polymer gel electrolyte and fiber electrode must be solved.

　　 The team was finally inspired by the natural phenomenon that Parthenocissus tricuspidata is tightly intertwined with plant vines. After studying its mystery, the team designed a fiber electrode with multi-level network channels and orientation channels, and developed monomer solution to make it penetrate into the pore structure of the fiber electrode. The monomer generated polymer gel electrolyte after polymerization reaction, forming a tight and stable interface with the fiber electrode, Thus, both high security and high energy storage performance are achieved.

　　 On this basis, the team developed a continuous preparation method based on polymer gel electrolyte fiber batteries, which realized the preparation of thousands of meters long fiber lithium-ion batteries, with an energy density of 128 Wh/kg, which can effectively supply power for high-power appliances such as unmanned aerial vehicles, and has excellent deformation resistance.

On April 22, researchers from Fudan University demonstrated high-performance fiber batteries. Photographed by Xinhua News Agency reporter Liu Ying

　　 Peng Huisheng said that through the independent design of key equipment, the team has established a fiber battery pilot production line with the core steps of active slurry coating, polymer isolation film coating, fiber spiral winding, gel electrolyte composite and polymer melt packaging, realizing the capacity of 300 watt hours per hour, which is equivalent to that the batteries produced per hour can charge 20 mobile phones at the same time. This provides strong support for the large-scale application of fiber batteries.

　　 At present, the team has prepared large-area fiber battery fabric by industrial knitting method. Under the relevant industrial standards, the battery fabric has no leakage, fire and other accidents after undergoing high current charge and discharge, overvoltage charge and undervoltage discharge, and high temperature storage, showing good safety and stability; The battery fabric can still safely and stably supply power to electrical appliances in high and low temperature, vacuum environment and external force destruction.

　　 "This fiber battery can be used in fire and disaster relief, polar scientific research, aerospace and other important fields, and more application scenarios need to be developed by all parties," said Peng Huisheng.