期刊
ADVANCED MATERIALS
卷 34, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101976
关键词
high-temperature energy storage; nanocomposites; polyimide-poly(amic acid) copolymers; polymer-based dielectric capacitors
类别
资金
- National Key Research and Development Program of China [2019YFA0307900, 2016YFA0300103]
- National Natural Science Foundation of China [51790491, 51972296, 21521001, 52125204]
- Fundamental Research Funds for the Central Universities [WK2030000035]
The study developed nanocomposites based on polyimide-poly(amic acid) copolymers with a very low amount of boron nitride nanosheets, significantly enhancing the energy density and efficiency of high-temperature capacitors. Experimental results demonstrate outstanding performance of the high-temperature polymer-based capacitors under actual working conditions, withstanding charge-discharge cycles and high-temperature endurance tests.
The developments of next-generation electric power systems and electronics demand for high temperature (approximate to 150 degrees C), high energy density, high efficiency, scalable, and low-cost polymer-based dielectric capacitors are still scarce. Here, the nanocomposites based on polyimide-poly(amic acid) copolymers with a very low amount of boron nitride nanosheets are designed and synthesized. Under the actual working condition in hybrid electric vehicles of 200 MV m(-1) and 150 degrees C, a high energy density of 1.38 J cm(-3) with an efficiency higher than 96% is achieved. This is about 2.5 times higher than the room temperature energy density (approximate to 0.39 J cm(-3) under 200 MV m(-1)) of the commercially used biaxially oriented polypropylene, the benchmark of dielectric polymer. Especially, the energy density and efficiency at 150 degrees C show no sign of degradation after 20 000 cycles of charge-discharge test and 35 days' high-temperature endurance test. This research provides an effective and low-cost strategy to develop high-temperature polymer-based capacitors.
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