Gold/ultra-high molecular weight polyethylene nanocomposites for electrical energy storage: Enhanced recovery efficiency upon uniaxial deformation
2021
The growing demand for renewable energy sources has prompted the development
of dielectric materials with the ability to store and efficiently recover electrical
energy. Here, we correlate the structure and thermal conductivity of uniaxially oriented disentangled ultra-high molecular weight polyethylene (dis-UHMWPE) composites reinforced with gold nanoparticles with their electrical properties and
potential application as electrical energy storage devices. Stretching increases the
orientation of the polymer chains and thus the crystallinity and reduces the aggregation of gold nanoparticles while the thermal conductivity enhances significantly
along the orientation axis. The structural changes driven by stretching result in two
competing effects; on the one hand, the crystallinity increase reduces the permittivity of the composites and increases the resistivity, while on the other hand the
recovery efficiency of oriented materials excels that of unstretched samples by up to
6 times at 5 s. Therefore, our work shows the structure–property relationship in
electrical energy storage materials
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