新型交联聚醚酰亚胺电介质的制备及储能特性

Preparation and energy storage performances of novel cross-linked polyetherimide dielectrics

摘要:

采用2,4,6-三氨基嘧啶（TAP）作为交联剂制备了一种具有交联结构的新型聚醚酰亚胺电介质材料。结果表明，随着TAP含量的增加，交联聚醚酰亚胺的击穿强度逐渐增大，当TAP含量为2 wt%时，交联聚醚酰亚胺的击穿强度提升至399.4 MV/m，相较于非交联聚醚酰亚胺提高了23.3%。由于交联结构抑制了内部极化损耗和弛豫损耗，交联聚醚酰亚胺电介质材料的介电损耗随着TAP含量的增加而降低。此外，交联结构进一步提升了聚醚酰亚胺电介质材料高温下的放电能量密度（Ud）和充放电效率（η），当TAP含量为2 wt%时，交联聚醚酰亚胺在150 °C时的最大Ud为2.53 J/cm3，相较于聚醚酰亚胺提升了24.8%。该研究为制备高温下具有更优Ud和η的聚醚酰亚胺电介质材料提供了新思路。

Abstract:

Novel polyetherimide (PEI) dielectrics with cross-linked networks were firstly prepared by utilizing 2,4,6-Triaminopyrimidine (TAP) as cross-linker. The results showed that the breakdown strength of cross-linked PEI with 2 wt% TAP increased to 399.4 MV/m, showing an increment of 23.3% in comparison with non-cross-linked PEI. Additionally, owing to the restrained polarization loss and relaxation loss by cross-linked networks, the dielectric loss of cross-linked PEI dielectric gradually decreased with increasing content of TAP. Of particular significance was that the c-PEI dielectrics exhibited improved discharged energy density (Ud) and charge-discharge efficiency (η) at high temperature. The maximum Ud of cross-linked PEI with 2 wt% TAP was 2.53 J/cm3 at 150 °C, which was 24.8% higher than non-cross-linked PEI. This research provides an innovative strategy to achieve novel PEI dielectrics with improved Ud and η at high temperature.