Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization

Wang, Yifei1,2; Wang, Linxi1,2; Yuan, Qibin1,2; Chen, Jie1,2; Niu, Yujuan1,2; Xu, Xinwei1,2; Cheng, Yatong1,2; Yao, Bin1,2; Wang, Qing3; Wang, Hong1,2,4

2018-02

10.1016/j.nanoen.2017.12.018

Nano Energy   影响因子和分区

2211-2855

2211-3282

Sandwich-structured polymer nanocomposites that provide a pathway to overcome the paradox between permittivity and breakdown strength ever existing in dielectric materials are receiving increasing attentions for their superior energy storage performance. Despite certain advances obtained in previous effort, further enhancement of the energy density by structure optimizing is still a challenge. Herein, we present a newly designed sandwich-structured barium titanate/poly(vinylidene fluoride-co-hexafluoropropylene) (BaTiO3/P(VDF-HFP)) nanocomposite via layer-by-layer tape casting process, where high contents of BaTiO3 nanoparticles are dispersed in the middle layer to offer high permittivity, while two outer layers containing small amounts of BaTiO3 provide favorable breakdown strength. The solution-processed nanocomposites with an optimal composition exhibits an ultrahigh discharged energy density of 26.4 J cm(-3) and a superior discharged efficiency of 72%, which are by far the highest values ever achieved in sandwich-structured dielectric polymer composites. It is revealed that the designed structure can enhance the breakdown strength and discharged efficiency by preventing the charge injection from electrodes and impeding the development of electrical tress during breakdown process, as confirmed by the leakage current and thermally stimulated depolarization current measurements, as well as the finite element simulations. This work represents a new design paradigm to exploit advanced dielectric materials for electrical energy storage applications.

Polymer nanocomposites Sandwich structure Capacitor Electrical energy storage Dielectric breakdown

SCI ; EI

英语

通讯

National Natural Science Foundation of China[61471290] ; National Natural Science Foundation of China[61631166004]

Chemistry ; Science & Technology - Other Topics ; Materials Science ; Physics

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied

WOS:000419833900042

ELSEVIER SCIENCE BV

20175104557212

Barium titanate ; Capacitors ; Dielectric properties of solids ; Electric breakdown ; Energy efficiency ; Energy storage ; Finite element method ; Fluorine compounds ; Leakage currents ; Nanocomposites ; Permittivity ; Polymers ; Sandwich structures ; Storage (materials)

Energy Conservation:525.2 ; Energy Storage:525.7 ; Storage:694.4 ; Electricity: Basic Concepts and Phenomena:701.1 ; Electric Components:704.1 ; Dielectric Materials:708.1 ; Nanotechnology:761 ; Inorganic Compounds:804.2 ; Polymeric Materials:815.1 ; Numerical Methods:921.6 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Solid State Physics:933

Web of Science

1.Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
2.Xi An Jiao Tong Univ, Sch Microelect, Xian 710049, Shaanxi, Peoples R China
3.Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
4.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Wang, Yifei,Wang, Linxi,Yuan, Qibin,et al. Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization[J]. Nano Energy,2018,44:364-370.

Wang, Yifei.,Wang, Linxi.,Yuan, Qibin.,Chen, Jie.,Niu, Yujuan.,...&Wang, Hong.(2018).Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization.Nano Energy,44,364-370.

Wang, Yifei,et al."Ultrahigh energy density and greatly enhanced discharged efficiency of sandwich-structured polymer nanocomposites with optimized spatial organization".Nano Energy 44(2018):364-370.