中国

Xi’an Jiaotong University researchers have made important progress in the field of polymer storage capacitors

The rapid consumption of fossil energy has led to the development and utilization of renewable energy and the development of various energy storage technologies. Due to its high power density and fast charge and discharge rate, polymer energy storage capacitors can convert intermittent energy sources such as wind energy and tidal energy with maximum efficiency. They are widely used in electronic information, aerospace, smart grid, hybrid electric vehicles and other fields. prospect. But because the low dielectric constant of most polymers themselves limits their ability to store electrical energy and make it bulky. At present, scientists usually use a method of adding a high dielectric constant inorganic filler to a ferroelectric polymer to prepare a composite dielectric material with a high energy storage density, but the introduction of a high volume fraction of ceramic particles increases the energy loss of the material. Reduce its charge and discharge efficiency and cycle life. Therefore, how to develop polymer storage capacitors with high energy storage density, high energy storage efficiency and good reliability has become an urgent research difficulty.

Recently, Professor Wang Hong from the Functional Materials Research Center of Xi’an Jiaotong University developed a sandwich-structured all-polymer dielectric energy storage material with high energy storage density, high energy storage efficiency and excellent stability. Unlike conventional composite dielectric materials, this work introduces a low dielectric constant polymer layer into the ferroelectric polymer to form a three-layer configuration. The working system successfully studied the energy storage density of ferroelectric polymers by establishing a plurality of interlayer interfaces and regulating the composition ratio of the polymer in terms of dielectric properties, macroscopic polarization, energy storage, and rapid charge and discharge. And the improvement of energy storage efficiency. Finally, the material achieved a storage density of 20.3 J × cm -3 and an energy storage efficiency of 84%, which is the optimal integrated energy storage performance of the currently reported polymer dielectric materials. At the same time, the material has good charge and discharge cycle stability and mechanical fatigue resistance. This work demonstrates the enormous potential of sandwich-structured ferroelectric polymers for electrical energy storage applications.

The above research results are published online in the internationally renowned journal Nano Energy (IF=13.12) under the title “Multilayered Ferroelectric Polymer Films Incorporating Low-Dielectric-Constant Components for Concurrent Enhancement of Energy Density and Charge-Discharge Efficiency”. Chen Jie, Ph.D. student of Xi’an Jiaotong University, is the first author of this article. Professor Wang Hong is the author of this article. Xi’an Jiaotong University is the first signatory of this article. Southern University of Science and Technology and Pennsylvania State University are the cooperation units of this paper. This research work is another important achievement of Professor Wang Hong’s research group in the field of dielectric energy storage, published in Advanced Materials, Advanced Functional Materials, Nano Energy, Journal of Materials Chemistry A and other internationally renowned journals.


Post time: Oct-27-2018
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