On February 28, the selection results of the 17th "Top Ten Advances in Chinese Science" were announced, and the "Large-scale Preparation of High-performance Fiber Lithium-ion Batteries" by Peng Huisheng's team at Fudan University was selected. The event was led by the High Technology Research and Development Center (Basic Research Management Center) of the Ministry of Science and Technology, and five editorial departments, including China Basic Science, Science and Technology Herald, Journal of the Chinese Academy of Sciences, China Science Foundation and Science Bulletin, participated in recommending the progress of scientific research, and invited academicians of the Chinese Academy of Sciences, academicians of the Chinese Academy of Engineering, directors of the State Key Laboratory, members of the overall expert group and project leaders of the relevant key special projects of the National Key Research and Development Program. More than 3,500 well-known experts and scholars, including experts from the original 973 Program Advisory Group and Advisory Group and chief scientist of the project, voted online on 30 candidate scientific progresses, and the top 10 with the highest number of votes were selected as "2021 Top Ten Advances in Chinese Science".
Previously, on January 26, the Journal of Semiconductors released the 2021 "Top Ten Research Progress of Chinese Semiconductors", and Peng Huisheng's team's work on the fully flexible fabric display system was selected.
The results of the new fiber polymer lithium-ion battery were published in Nature (2021, 697, 57) in September 2021. This work focuses on the hyperbolic cotangent function relationship between the internal resistance and length of the fiber lithium-ion battery, effectively solves the problem of interface stability of the active material and the fiber electrode, and continuously constructs a new type of fiber polymer lithium-ion battery with high safety and high performance. The energy density of fiber polymer lithium-ion batteries exceeds 85 Wh/kg, and has good cycle stability, and the capacity retention rate of the battery after 500 cycles is still 90.5%, and the coulomb efficiency is 99.8%. Even in the case of a radius of curvature of 1 cm, after bending the fiber lithium-ion battery 100,000 times, its capacity retention rate is still greater than 80%. Further through the textile method, a large area battery fabric with high performance and high safety is obtained. If the battery fabric and the wireless charging transmitter are integrated, you can safely and stably charge your smartphone wirelessly. The new fiber polymer lithium-ion battery is expected to show important application prospects in a wide range of fields such as smart fabrics, wearable devices, and biological medical devices.
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Schematic diagram of fiber polymer lithium-ion battery weaving.
The results of the fully flexible fabric display system were published in Nature(2021, 591, 240) in March 2021. This work focuses on breaking through the research paradigm of the classical sandwich structure of traditional display devices, proposing to integrate micro-light-emitting devices at the interweaving point of polymer composite fibers, that is, through the weaving method, the composite fibers loaded with a luminescent active layer and transparent conductive fibers are interwoven together, and the active material at the interweaving point is excited by the electric field and emits light, and each interweaving point is similar to a pixel point in the traditional display, and the display function can be realized by programming the input drive signal to the longitude and latitude fiber electrodes (Figure 2). The research team further realized a large area display fabric with a length of 6 m and a width of 20 cm and about 500,000 luminous points, with a brightness deviation of less than 8% of the luminous point, a single luminous point brightness of 115.1 cd/m2, a power consumption as low as a few milliwatts, a distance between the luminous points can reach the micron level, and the resolution can meet the needs of display applications. The research team has also realized an intelligent fabric system that integrates functions such as energy conversion/storage, sensing, and real-time communication, showing good application prospects in real-time positioning, daily communication, medical assistance, etc., and is expected to promote the development of flexible electronics, portable human-computer interaction systems, flexible health monitoring terminals, national defense intelligent equipment and other important fields.
a) Schematic diagram of the fabric structure, where the luminous warp and conductive wefts emit light emitting light by excitation of the interwoven area under the condition of applied voltage; b, c) photographs of the multi-colored luminescent fabric and the luminous dot, respectively.
Sources
Department of Polymer Sciences
Editing
Wang Zhenyi
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