Surface modified BaTiO₃-polystyrene nanocomposites for energy storage
by Venkata S. Puli; Ravinder Elupula; Brian C. Riggs; Scott M. Grayson; Ram S. Katiyar; Douglas B. Chrisey
International Journal of Nanotechnology (IJNT), Vol. 11, No. 9/10/11, 2014

Abstract: Major research efforts have been focused towards developing high dielectric constant (ε), low loss (tan δ) and high electrical breakdown dielectrics for energy storage capacitors. Combining the low cost, ease of processing and high breakdown field strength (BDS) of polymers with the high ε ceramic fillers will result in high-energy storage capacitors. Herein, we show progress in developing low cost, low weight and high electrical energy storage capacitors by mixing polystyrene (PS, mw = 177,000 g/mol) and hydroxyl-BaTiO₃nanoparticles (h-BT, ∼50 nm) in a highly polar solvent (DMF) on weight percent basis. Surface modification of crude-BT(c-BT) by H₂O₂ resulted in h-BT, which renders h-BT highly dispersed due to the surface hydroxyl functional groups. Ceramic-polymer nanocomposites (80PS-20hBT and 20PS-80hBT) exhibited relatively high BDS (∼475 kV/cm and 247 kV/cm) and a large ε (∼13 and 40). Room temperature (300 K) energy density values for PS, 80PS-20hBT, 20PS-80hBT and h-BT are 4.33, 0.12, 0.10 and 0.36 J/cm³, respectively.

Online publication date: Wed, 14-Jan-2015

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