Transparent and flexible cellulose dielectric films with high breakdown strength and energy density
Transparent and flexible cellulose dielectric films with high breakdown strength and energy density
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具有高击穿强度和能量密度的透明柔性纤维素介电薄膜
DOI：
10.1016/j.ensm.2019.12.034
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发表时间：
2020-04
影响因子：
20.4
通讯作者：
Xiong Chuanxi
中科院分区：
文献类型：
--
作者：
Yin Yanan;Zhang Chenggang;Yu Wenchao;Kang Guohuang;Yang Quanling;Shi Zhuqun;Xiong Chuanxi
高击穿强度和高能量密度的介质电容器是电力设备脉冲功率系统中不可缺少的重要组成部分。同时，化石资源的减少和能源需求的提高促进了可再生资源在能源领域的发展。在这里，再生纤维素（RC）薄膜制造通过一个简单的过程。结果表明，在合适的纤维素浓度和分子量下制备的干RC膜具有较高的放电能量密度和效率。采用纤维素浓度为3.5%溶解、硫酸再生、90 °C真空干燥的方法制备的RC薄膜，在击穿强度为500 MV/m时，其能量密度为16.78 J/cm 3，效率高达84.8%，是双向拉伸聚丙烯的10倍左右。因此，这些柔性和透明的纤维素介电薄膜在新型高性能生物质基薄膜介电电容器领域是很有前途的。
Dielectric capacitors with high breakdown strength and energy density are indispensable in pulsed power systems of electric device. Meanwhile the reduction of fossil resources and the improvement of energy requirements promote the development of renewable resources in energy field. Here, regenerated cellulose (RC) films were fabricated via a simple process. The results showed that the dry RC films obtained from suitable cellulose concentration and molecular weight possessed high discharged energy density and efficiency. RC film prepared by dissolution with a cellulose concentration of 3.5%, regeneration with H2SO4aqueous solution and vacuum drying at 90 °C exhibited high efficiency of 84.8% and an ultrahigh discharged energy density of 16.78 J/cm3at breakdown strength of 500 MV/m which is around 10 times higher than that of biaxially oriented polypropylene. Therefore, these flexible and transparent cellulose dielectric films are promising in the field of novel high-performance biomass-based film dielectric capacitor.
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