Gradient core-shell structure enabling high energy storage performances in PVDF-based copolymers

Sun, Xindi1; Zheng, Yantao1; Liu, Kaixin2; Liu, Zhigang2; Zhang, Fengyuan2; Deng, Yuan3; Wang, Yao1,3

2024-04-02

10.1039/d4ta00008k

JOURNAL OF MATERIALS CHEMISTRY A   影响因子和分区

2050-7488

2050-7496

["Polymer-based capacitors are essential components in modern electronics and power systems. The long-standing challenge that is the contradiction between the breakdown strength and permittivity of dielectric materials has severely impeded their development for high-power capacitors. Polymer blends have recently been demonstrated as promising candidates with remarkably enhanced energy storage capability, and our previous study has indicated that the construction of a core-shell structure is an effective strategy. Herein, blends of poly(vinylidene fluoride)-based copolymers with large discrepancy in polarization, i.e., poly(vinylidene fluoride-co-trifluoroethylene) (PVDF-TrFE) and poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) have been elaborately designed with a gradient composition distribution in a core-shell structure by employing a coaxial electrospinning technique. By adjusting the monomer ratio of functional group HFP/TrFE, a polarization distribution which strongly correlates with the crystallization of the polar phase and its topological distribution has been subtly regulated to decrease from core to shell. Therefore, at the optimal HFP/TrFE ratio of 2/1, a high breakdown strength of 694.8 kV mm-1 and discharged energy density of Ue of similar to 23.6 J cm-3 have been achieved, with a high energy density of 27.8 J cm-3 and power of 10.7 MW cm-3 delivered to a 20 k omega load. Moreover, the film shows robust long-term reliability, enduring up to 107 charge-discharge cycles, highly competitive with currently reported polymer-based dielectrics. The underlying relationship between the HFP/TrFE ratio and polar phase and its topological distribution has been investigated from molecular to microstructural scale by combining molecular dynamic simulation and finite element analysis. Our study thus provides a promising alternative route for boosting the comprehensive energy storage performance of polymer dielectrics.","An elaborate gradient core-shell structure design for all-organic polymers significantly boosts comprehensive energy storage performance."]

SCI ; EI

英语

其他

National Natural Science Foundation of China["92066203","51872009"]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:001178340300001

ROYAL SOC CHEMISTRY

Web of Science

1.Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
3.Beihang Univ, Hangzhou Innovat Inst, Key Lab Intelligent Sensing Mat & Chip Integrat Te, Hangzhou 310052, Zhejiang, Peoples R China

Sun, Xindi,Zheng, Yantao,Liu, Kaixin,et al. Gradient core-shell structure enabling high energy storage performances in PVDF-based copolymers[J]. JOURNAL OF MATERIALS CHEMISTRY A,2024,12(14).

Sun, Xindi.,Zheng, Yantao.,Liu, Kaixin.,Liu, Zhigang.,Zhang, Fengyuan.,...&Wang, Yao.(2024).Gradient core-shell structure enabling high energy storage performances in PVDF-based copolymers.JOURNAL OF MATERIALS CHEMISTRY A,12(14).

Sun, Xindi,et al."Gradient core-shell structure enabling high energy storage performances in PVDF-based copolymers".JOURNAL OF MATERIALS CHEMISTRY A 12.14(2024).