High Energy Density (HED) Biaxially-Oriented Poly-Propylene (BOPP) Capacitors For Pulse Power Applications

Barshaw, E.; White, J.; Chait, M.; Cornette, J.B.; Bustamante, Juan; Folli, F.; Biltchick, D.; Borelli, G.; Picci, G.; Rabuffi, M.

doi:10.1109/tmag.2006.887682

Cited by 149 publications

(66 citation statements)

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“…[5][6][7] Among these devices, which include batteries, supercapacitors, fuel cells, etc., parallel plate capacitors offer high power density but low energy density. The current state-of-the-art polymer dielectric lm, biaxially oriented polypropylene (BOPP) [12][13][14][15][16] has a breakdown strength of 730 MV m À1 and low dielectric loss (tan d $ 0.0002 at 1 kHz, r.t.), but suffers from a low dielectric constant of 2.2 and a reduced breakdown strength and cycle life at temperatures in excess of 85 C. [8][9][10][11] To maximize the energy density, a desirable dielectric should exhibit high dielectric constant (K), high breakdown strength, and low loss during chargedischarge cycles.…”

Section: Introductionmentioning

confidence: 99%

Rational design and synthesis of polythioureas as capacitor dielectrics

et al. 2015

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Rational strategies combining computational and experimental procedures accelerate the process of designing and predicting properties of new materials for a specific application. Here, a systematic study is presented on polythioureas for high energy density capacitor applications combining a newly developed modelling strategy with synthesis and processing. Synthesis was guided by implementation of a high throughput hierarchical modelling with combinatorial exploration and successive screening, followed by an evolutionary structure search based on density functional theory (DFT). Crystalline structures of polymer films were found to be in agreement with DFT predicted results. Dielectric constants of $4.5 and energy densities of $10 J cm À3 were achieved in accordance with Weibull characteristic breakdown fields of $700 MV m À1 . The variation of polymer backbone using aromatic, aliphatic and oligoether segments allowed for tuning dielectric properties through introduction of additional permanent dipoles, conjugation, and better control of morphology.

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Section: Introductionmentioning

confidence: 99%

Rational design and synthesis of polythioureas as capacitor dielectrics

et al. 2015

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“…Among all existing polypropylene types, biaxially oriented isotactic polypropylene (BOiPP) is the preferable material for capacitors compared to unoriented PP films, due to its excellent electrical and mechanical properties, and better compatibility with synthetic insulating liquids . Biaxially oriented PP can withstand three times the voltage of unoriented films, and also have a higher Young modulus .…”

Section: Introductionmentioning

confidence: 99%

Structure effect of thin film polypropylene view by dielectric spectroscopy and X‐ray diffraction: Application to dry type power capacitors

Gallot‐Lavallée

Rain

Lesaint

et al. 2015

J of Applied Polymer Sci

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This work reports on the relationship between structure and dielectric properties of biaxially oriented polypropylene. The morphology of semicrystalline bioriented isotactic polypropylene films is investigated using wide angle X-ray diffraction and Polarized Optical Microscopy. A b-orthorhombic structure, with a crystallinity ratio of about 46%, and "Crater" morphology of the b-form is identified. Dielectric properties are measured by Broadband Dielectric Spectroscopy over a wide temperature range (2150 to 1258C). Since the dissipation factor of the PP is very low, special care was taken to obtain valid data. Two main relaxation processes are observed: a a-relaxation peak associated to the glass transition temperature (Tg) at temperature about 278C, and a broad b*-relaxation at about 2608C, partly attributed to CH orientation. The variation of the dissipation factor versus sample thickness (from 3.8 to 11.8 mm) is correlated and partly explained by the increase of crystallinity ratio and lamella size at larger thicknesses. It comes out that the thinnest film seems perfectly meet the application requesting, namely lowest dissipation factor and highest permittivity.

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“…9 Considering micromorphology-related charge trap density and trap level, the microstructure would inevitably influence the accumulation and migration of space charge. 14,15 The frequently rapid release of space charge during the capacitor discharge can bring about the frequent damage to the polymer matrix, 16 which would finally shorten the life of the capacitor. [11][12][13] On the other hand, part of the injected charge may be released accompanying with the release of free charge at the electrodes during the discharge procedure of capacitors.…”

Section: Introductionmentioning

confidence: 99%

Fast space charge behavior in heat‐treated polypropylene films

Zheng

Min

Dong

et al. 2015

J of Applied Polymer Sci

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In this study, the characterization of the short-circuit current within hundreds of nanoseconds is proposed to study the effect of heat treatment on fast space charge behavior in the polarized biaxially oriented polypropylene (BOPP) films. The BOPP films were cooled either quickly or slowly during the sample preparation. The damped oscillating feature was found in the short-circuit current of all the polarized film samples, but the periods of the oscillating current for the samples prepared by fast cooling rate decrease faster. Bipolar space charge injection in the polarized BOPP films was observed by the thermal pulse (TP) measurement. The variation feature of the short-circuit current was considered to be associated with the varying fast space charge behavior, which depended on the varying structural traps modified by the heat treatment during the sample preparation. The sample subjected to fast cooling process was with relatively shallow trap level revealed by the thermally stimulated current method, which led to higher mobility of the escaping charge in the sample. The TP measurements were utilized to analyze space charge features in the polarized BOPP films.

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High Energy Density (HED) Biaxially-Oriented Poly-Propylene (BOPP) Capacitors For Pulse Power Applications

Cited by 149 publications

References 0 publications

Rational design and synthesis of polythioureas as capacitor dielectrics

Rational design and synthesis of polythioureas as capacitor dielectrics

Structure effect of thin film polypropylene view by dielectric spectroscopy and X‐ray diffraction: Application to dry type power capacitors

Fast space charge behavior in heat‐treated polypropylene films

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