Citation: Jian Wang, Baohui Wang, Pin Ma, Yifei Zhang, Honghong Gong, Biyun Peng, Sen Liang, Yunchuan Xie, Hailong Wang. Regulation of uniformity and electric field distribution achieved highly energy storage performance in PVDF-based nanocomposites via continuous gradient structure[J]. Chinese Chemical Letters, ;2025, 36(4): 109714. doi: 10.1016/j.cclet.2024.109714 shu

Regulation of uniformity and electric field distribution achieved highly energy storage performance in PVDF-based nanocomposites via continuous gradient structure

Jian Wang ^{a, *,} ,
Baohui Wang ^a ,
Pin Ma ^a ,
Yifei Zhang ^b ,
Honghong Gong ^c ,
Biyun Peng ^a ,
Sen Liang ^a ,
Yunchuan Xie ^{c, *,} ,
Hailong Wang ^{a, *,}

a.
Ningxia Key Laboratory of Photovoltaic Materials, School of Materials and New Energy, Ningxia University, Yinchuan 750021, China
b.
Chemistry Department, University of Alberta, Edmonton T6G2N4, Canada
c.
Xi’an Key Laboratory of Sustainable Energy Material Chemistry, School of Chemistry, Xi’an Jiaotong University, Xi’an 710049, China

wangjian@nxu.edu.cn

ycxie@xjtu.edu.cn

wanghailong@nxu.edu.cn

Received Date: 24 January 2024
Revised Date: 27 February 2024
Accepted Date: 1 March 2024
Available Online: 7 March 2024

Figures(5)

PVDF-based nanocomposites have gained significant focus in capacitors for their excellent dielectric strength, its multi-scale structural inhomogeneity is the bottleneck for improving the energy storage performance. Here, the composite components are optimized by the matrix modification, BST (Ba_0.6Sr_0.4TiO₃) ceramic fibrillation and surface coating. A series of PVDF/polymethyl methacrylate/lysozyme@BST nanofibers with continuous gradient distribution (PF-M/mBST nf-g) are prepared by the concentration gradient-biaxial high-speed electrospinning. The finite element simulation and experiment results indicate that the continuous gradient structure is favorable for the microstructure and inhomogeneity of the electric field distribution, significantly increasing the breakdown strength (E_b) and the permittivity (ε_r), as well as effectively suppressing the interfacial injected charge and leakage current. As a result, the energy storage density (U_e) of 23.1 J/cm³ at 600 MV/m with the charge-discharge efficiency (η) of 71% is achieved compared to PF-M (5.6 J/cm³@350 MV/m, 65%). The exciting energy storage performance based on the well-designed PF-M/mBST nf-g provides important information for the development and application of polymer nanocomposite dielectrics.
- Nanocomposites,
- Nanofibers,
- PVDF-based polymers,
- Breakdown strength,
- Energy storage
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