Flexible Cellulose/BaTiO3 Nanocomposites with High Energy Density for Film Dielectric Capacitor
Flexible Cellulose/BaTiO3 Nanocomposites with High Energy Density for Film Dielectric Capacitor
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用于薄膜介质电容器的高能量密度柔性纤维素/BaTiO3纳米复合材料
DOI：
10.1021/acssuschemeng.9b01302
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发表时间：
2019
影响因子：
8.4
通讯作者：
Xiong Chuanxi
中科院分区：
文献类型：
--
作者：
Zhang Chenggang;Yin Yanan;Yang Quanling;Shi Zhuqun;Hu Guo-Hua;Xiong Chuanxi
通过在 NaOH/尿素水溶液中简单混合，将 BaTiO3 纳米粒子 (BTNP) 或 BaTiO3 纳米纤维 (BTNF) 掺入再生纤维素 (RC) 中，制备再生纤维素/BaTiO3 纳米复合薄膜。结果表明，适当添加BTNP或BTNF可以提高RC的介电常数、击穿强度、能量密度，同时降低介电损耗。同时，RC-BTNF复合材料表现出比RC-BTNP更好的介电和机械性能。特别是，含有2体积％BTNF的RC-2BTNF复合膜在370MV/m的击穿强度下表现出13.14J/cm3的超高放电能量密度。此外，RC-2BTNF在300 MV/m时的放电能量密度为9.45 J/cm3，是已报道的聚合物基介电薄膜在300 MV/m时的最高放电能量密度（接近薄膜电容器工作时的实际电场强度）。因此，这些柔性纤维素基介电材料在新型高性能薄膜介电电容器领域具有广阔的前景。
Regenerated cellulose/BaTiO3nanocomposite films were fabricated by incorporation of BaTiO3nanoparticle (BTNP) or BaTiO3nanofiber (BTNF) in regenerated cellulose (RC) via simple blending in aqueous NaOH/urea solution. The results showed that a proper addition of BTNP or BTNF could improve the dielectric constant, breakdown strength, energy density of RC and reduce the dielectric loss simultaneously. Meanwhile, RC-BTNF composites exhibited better dielectric and mechanical properties than RC-BTNP. Especially, the RC-2BTNF composite film with 2 vol % BTNF exhibited an ultrahigh discharged energy density of 13.14 J/cm3at a breakdown strength of 370 MV/m. Moreover, the discharged energy density of 9.45 J/cm3at 300 MV/m of RC-2BTNF is the highest discharged energy density of reported polymer-based dielectric films at 300 MV/m (closed to actual electric field strength when film capacitors work). Therefore, these flexible cellulose-based dielectric materials are promising in the field of novel high-performance film dielectric capacitor.