刘泳斌, 徐雅婷, 吴明, 高景晖, 钟力生. 半互穿网络结构提升聚偏氟乙烯基材料储能温度稳定性[J]. 高电压技术, 2024, 50(6): 2374-2381. DOI: 10.13336/j.1003-6520.hve.20231719
引用本文: 刘泳斌, 徐雅婷, 吴明, 高景晖, 钟力生. 半互穿网络结构提升聚偏氟乙烯基材料储能温度稳定性[J]. 高电压技术, 2024, 50(6): 2374-2381. DOI: 10.13336/j.1003-6520.hve.20231719
LIU Yongbin, XU Yating, WU Ming, GAO Jinghui, ZHONG Lisheng. Enhanced Temperature Stability of Energy Storage Performance in Semi-interpenetrating Crosslinked PVDF-blends[J]. High Voltage Engineering, 2024, 50(6): 2374-2381. DOI: 10.13336/j.1003-6520.hve.20231719
Citation: LIU Yongbin, XU Yating, WU Ming, GAO Jinghui, ZHONG Lisheng. Enhanced Temperature Stability of Energy Storage Performance in Semi-interpenetrating Crosslinked PVDF-blends[J]. High Voltage Engineering, 2024, 50(6): 2374-2381. DOI: 10.13336/j.1003-6520.hve.20231719

半互穿网络结构提升聚偏氟乙烯基材料储能温度稳定性

Enhanced Temperature Stability of Energy Storage Performance in Semi-interpenetrating Crosslinked PVDF-blends

  • 摘要: 随着新能源汽车和油气勘探等高温环境对电储能器件的需求迅速增长,对储能电容器的小型化与高温化要求越来越高。常见的极性介质材料能够实现高储能密度特性,但是随着温度的升高其介电性能严重降低;而常见的高温聚合物,虽然高温介电性能温度稳定性良好,但是极化响应较低。为此研究了利用半互穿交联聚合物共混方法,在具有高介电性能的聚偏氟乙烯中引入具有高玻璃化转变温度与高击穿强度的聚甲基丙烯酸酯,构建互穿交联网络结构协同提高储能性能及其温度稳定性。通过差示扫描量热法和X射线衍射结果发现形成的半互穿交联聚合物无定形区温度稳定性随聚甲基丙烯酸酯含量增加而增强。获得的最优组分在30~120 ℃范围内同一电场强度下的储能密度与效率控制在6.9~7.6 J/cm3与81%~59.7%,储能密度随温度的相对变化率在11.2%,高于大部分铁电聚合物。

     

    Abstract: With the advancement of science and technology, energy storage capacitors are gradually developing towards miniaturization and high temperature, especially in electrical energy vehicles, oil and gas exploration and other fields. However, as the temperature increases, the dielectric properties of polar dielectric materials that can achieve high energy storage characteristics are severely reduced, so they cannot be used in high temperature environments. High-temperature polymers can be used in high temperature environments, but it is difficult to obtain high energy storage density to achieve the miniaturization goal of energy storage capacitors because of their relatively low dielectric constant. Therefore, the semi-interpenetrating polymer network structure of PVDF and P(MMA-EGMDA) was studied by introducing ethylene glycol dimethacrylate(EGDMA) with double bonds based on the copolymerization-blending method to strengthen the physical connection between PVDF and P(MMA-EGDMA) and improve the compatibility between the two. At the same time, the crosslinked structure is used to improve the temperature stability of the dielectric properties of the composite material. Among them, the energy storage density and efficiency of SIPN PVDF/P(MMA-EGDMA)(42.9/57.1) are controlled at 6.9~7.6 J/cm3 and 81%~59.7% under the same electric field strength in the range of 30~120℃, and the relative change rate of energy storage density with temperature is 11.2%, which is higher than that of most ferroelectric polymers.

     

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