电介质储能薄膜的研究现状及提高储能密度的方法

doi:10.11896/cldb.18120168

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Abstract Due to the energy crisis and environmental pollution, the research and development of new energy is one of the important research issues and has attracted much attention nowadays. Besides the collection of new energy sources, the storage of energy has also received increasing attention. Usually, energy storage devices are batteries, fuel cells, super-capacitors, and dielectric capacitors. Among them, the batteries and fuel cells have high energy density, but the power density is low; the conventional dielectric capacitor has high power density, but the storage density is low; the power density and energy density of the super-capacitor are between the battery and the conventional capacitor.
Dielectric capacitors have the advantages of high dielectric constant, low dielectric loss, high power density, fast charge/discharge speed, large operating voltage/current, good reliability, and good temperature stability, and have been applied in the field of pulse power devices. Bia-xially oriented polypropylene (BOPP) has already been commercialized. However, dielectric capacitors have inherent shortage of low energy storage densities, which limits their applications range. As one focus of current research, it is a key issue to improve the energy storage density of capacitors. Compared with bulk materials, film capacitors have high electrical breakdown strength, and therefore have excellent energy storage densities. The focus of this paper is on the research status of inorganic energy storage films and methods to increase their energy storage density.
At present, a lot of researches have been carried out on energy storage thin films, and there are many structural systems, such as perovskite structure, strontium layer structure, pyrochlore structure, single metal oxide film, etc. Among them, perovskite structure film is the earliest and most common studied. Nowadays, the energy storage density of the lead-free perovskite structure film prepared by magnetron sputtering or laser pulse deposition is as high as 100 J/cm³ or more. However, due to the many methods of preparing the film and the complicated process, many factors can affect the performance of thin films, especially the energy storage density. The repeatability of the film process and the stability of the performance are very important. Based on the summary and analysis of literature, there are three methods to improve the energy storage density: element doping or multiphase solid solution is a relatively simple and common method, which can increase the polarization and breakdown strength, thereby increasing the energy storage density. Optimized preparation process can also improve the storage density of films. The modification methods include annealing process, local field engineering, orientation, stress, electrode and other aspects. The interface structure control of heterostructures is emerging in recent years and is a method for significantly increasing the energy storage density of a film capacitor.
In this paper, first the key parameters for evaluating the energy storage performance of dielectric materials are introduced. Secondly, a brief introduction about the classification of dielectrics is presented and the research status of several types of energy storage thin films (such as perovskite structure, pyrochlore structure and oxide structure, etc.) are summarized. Then, the methods for improvement in the energy storage density of thin films are analyzed. Finally, the research trend of ceramic thin films for energy storage is proposed, which would be beneficial for the deve-lopment of inorganic energy storage films.

Key words： dielectircs energy storage thin films modification energy storage density

Published: 30 September 2019

CLC number:

TB34

Fund:This work was financially supported by the Major Program of the National Natural Science Foundation of China (51790490), NSFC-Guangdong Joint Funds of the National Natural Science Foundation of China (U1601209) and the National Natural Science Foundation of China (51802078).

About author:: Chunli Diao is an associate professor at School of Phy-sics and Electronics of Henan University (HENU). She received her master degree at Wuhan University of Technology (WUT) in 2005 and joined HENU. Currently, she is pursuing her Ph.D. at WUT under the supervision of Prof. Hanxing Liu. Her research has focused on dielectrics for energy storage.
Hanxing Liu received his Ph.D. degree at Jilin University in 1990. He joined WUT in 1990, and now he is a professor in the School of Materials Science and Engineering at WUT. His research interests are focused on advanced dielectric materials and batteries.

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Cite this article:

DIAO Chunli,DONG Le,YANG Yi, et al. Research Progress of Dielectric Energy Storage Thin Films and Methods forImproving Energy Storage Density[J]. Materials Reports, 2019, 33(23): 3921-3929.

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http://www.mater-rep.com/EN/10.11896/cldb.18120168 OR http://www.mater-rep.com/EN/Y2019/V33/I23/3921

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