Core–shell structured PVDF-based copolymer fiber design for high energy storage performance
Core–shell structured PVDF-based copolymer fiber design for high energy storage performance
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核壳结构的 PVDF 共聚物纤维设计，具有高储能性能
DOI：
10.1063/5.0120895
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发表时间：
2022-11
影响因子：
3.2
通讯作者：
Yao Wang
中科院分区：
文献类型：
--
作者：
Xindi Sun;Lingyu Zhang;Yantao Zheng;Lu Yang;Yuan Deng;Yao Wang
由于高功率密度和超快的充放电速度，聚合物基电容器在高功率系统中非常有前途，但高性能电容器所要求的高介电常数和高击穿强度仍然是一个巨大的挑战。本文将聚偏氟乙烯-三氟乙烯共聚物(PVDF-TrFE)和聚偏氟乙烯-六氟丙烯共聚物(PVDF-HFP)在核壳结构纤维中同轴电纺，故意制造局部非均匀微结构。通过调节官能团HFP/TrFE单体的比例，精心设计了具有拓扑组成分布的P(VDF-HFP)/P(VDF-TrFE)杂化聚合物薄膜，实现了从核到壳的梯度极化分布。与相同成分的均匀杂化薄膜相比，核壳结构显著提高了击穿强度，从而显著提高了储能能力。当HFP/TrFE单体比为10：1时，薄膜的综合储能性能最好，Ue∼为20.7J/cm3，效率为67.8%，并且在106次充放电循环后仍能保持其储能性能。采用分子动力学模拟和有限元分析相结合的方法，揭示了分子水平上的偶极矩分布和微观尺度上的极化分布，进一步证明了精细的极化分布调节是高性能静电储能电容器的有效策略。
Polymer-based capacitors are very promising for high-power systems due to their high power density and ultrafast charge–discharge speed, yet reaching high dielectric constant and high breakdown strength simultaneously in dielectric polymers required by high-performance capacitors still remains a huge challenge. Herein, poly(vinylidene fluoride- co-trifluoroethylene) (PVDF-TrFE) and poly(vinylidene fluoride- co-hexafluoropropylene) (PVDF-HFP) were coaxial electrospun in core–shell structured fibers to create locally inhomogeneous microstructures deliberately. Through adjusting the functional group HFP/TrFE monomer ratio, P(VDF-HFP)/P(VDF-TrFE) hybrid polymer films with topological composition distribution have been elaborately designed, enabling gradient polarization distribution from core to shell. Compared with homogeneous hybrid films of the same composition, the core–shell structure significantly boosts breakdown strength, thus resulting in a significantly improved energy storage capacity. At an HFP/TrFE monomer ratio of 10:1, an optimal comprehensive energy storage performance has been achieved with U e ∼ 20.7 J/cm 3 and efficiency 67.8%; moreover, the film could maintain its energy storage performance after 10 6 charge/discharge cycles without reduction. Molecular dynamic simulation and finite element analysis have been employed in combination to reveal the dipole moments distribution at the molecular level and polarization distribution at the microscale, which further demonstrates that elaborate polarization distribution adjustment is an effective strategy toward high-performance electrostatic energy storage capacitors.
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DOI：
10.1007/s003390201428
发表时间：
2003-02
期刊：
Applied Physics A
影响因子：
--
作者：
X. Zhu;S. Lu;H. Chan;C. Choy;K. Wong
通讯作者：
X. Zhu;S. Lu;H. Chan;C. Choy;K. Wong
铁电/线性介电双层薄膜的设计：提高聚合物电容器储能性能的有效途径
影响因子：
3.7
作者：
Chen, Chen;Xing, Jiwen;Lei, Qingquan
通讯作者：
Lei, Qingquan
高密度储能用全有机聚合物杂化材料的极化分布设计
影响因子：
15.1
作者：
Wentian Wei;Chen Huang;Lingyu Zhang;Yao Wang;Meiyu Xu;Yuan Deng
通讯作者：
Yuan Deng
影响因子：
3
作者：
Gregorio, R
通讯作者：
Gregorio, R
影响因子：
8.6
作者：
Li, Zhong;Fredin, Lisa A.;Marks, Tobin J.
通讯作者：
Marks, Tobin J.