期刊
ADVANCED MATERIALS
卷 32, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201907227
关键词
breakdown strength; dielectric nanocomposites; energy storage; nanosheets
类别
资金
- National Natural Science Foundation of China [51790491, 51972296, 21521001, 51772284]
- National Key Research and Development Program of China [2016YFA0300103, 2019YFA0307900]
Polymer-based dielectric materials play a key role in advanced electronic devices and electric power systems. Although extensive research has been devoted to improve their energy-storage performances, it is a great challenge to increase the breakdown strength of polymer nanocomposites in terms of achieving high energy density and good reliability under high voltages. Here, a general strategy is proposed to significantly improve their breakdown strength and energy storage by adding negatively charged Ca2Nb3O10 nanosheets. A dramatically enhanced breakdown strength (792 MV m(-1)) and the highest energy density (36.2 J cm(-3)) among all flexible polymer-based dielectrics are observed in poly(vinylidene fluoride)-based nanocomposite capacitors. The strategy generalizability is verified by the similar substantial enhancements of breakdown strength and energy density in polystyrene-based nanocomposites. Phase-field simulations demonstrate that the further enhanced breakdown strength is ascribed to the local electric field, produced by the negatively charged Ca2Nb3O10 nanosheets sandwiched with the positively charged polyethyleneimine, which suppresses the secondary impact-ionized electrons and blocks the breakdown path in nanocomposites. The results demonstrate a new horizon of high-energy-density flexible capacitors.
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