Flexible Dielectric Nanocomposites with Ultrawide Zero-Temperature Coefficient Windows for Electrical Energy Storage and Conversion under Extreme Conditions.
Polymer dielectrics offer key advantages over their ceramic counterparts such as flexibility, scalability, low cost, and high breakdown voltages. However, a major drawback that limits more widespread application of polymer dielectrics is their temperature-dependent dielectric properties. Achieving dielectric constants with low/zero-temperature coefficient (L/0TC) over a broad temperature range is essential for applications in diverse technologies. Here, we report a hybrid filler strategy to produce polymer composites with an ultrawide L/0TC window of dielectric constant, as well as a significantly enhanced dielectric value, maximum energy storage density, thermal conductivity, and stability. By creating a series of percolative polymer composites, we demonstrated hybrid carbon filler based composites can exhibit a zero-temperature coefficient window of 200 °C (from -50 to 150 °C), the widest 0TC window for all polymer composite dielectrics reported to date. We further show the electric and dielectric temperature coefficient of the composites is highly stable against stretching and bending, even under AC electric field with frequency up to 1 MHz. We envision that our method will push the functional limits of polymer dielectrics for flexible electronics in extreme conditions such as in hybrid vehicles, aerospace, power electronics, and oil/gas exploration.
College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, China.
Khurram
K
Shehzad
College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, China.|Department of Chemistry and Biochemistry and California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Yang
http://orcid.org/0000-0003-3148-7678
Y
Xu
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University , Hangzhou 310027, China.
Chao
C
Gao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Zhejiang University , Hangzhou 310027, China.
Hanying
H
Li
State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University , Beijing 100084, China.
Zhi-Min
http://orcid.org/0000-0003-4427-8779
ZM
Dang
Cambridge Graphene Centre, University of Cambridge , Cambridge CB3 0FA, United Kingdom.
Tawfique
T
Hasan
College of Information Science and Electronic Engineering, Zhejiang University , Hangzhou 310027, China.|Institute for Materials Research and Innovation, The University of Bolton , Deane Road, Bolton BL3 5AB, United Kingdom.
Jack
J
Luo
Department of Chemistry and Biochemistry and California Nanosystems Institute, University of California , Los Angeles, California 90095, United States.
Xiangfeng
http://orcid.org/0000-0002-4321-6288
X
Duan
carbon nanotubes; dielectric constant; energy storage and conversion; polymer nanocomposites; zero temperature coefficient