Flexible dielectric film with high energy density based on chitin/boron nitride nanosheets
Flexible dielectric film with high energy density based on chitin/boron nitride nanosheets
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基于甲壳素/氮化硼纳米片的高能量密度柔性介电薄膜
DOI：
10.1016/j.cej.2019.123147
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发表时间：
2020-03
影响因子：
15.1
通讯作者：
Xiong Chuanxi
中科院分区：
文献类型：
--
作者：
Wang Jinyu;Chen Huan;Li Xueqian;Zhang Chenggang;Yu Wenchao;Zhou Liang;Yang Quanling;Shi Zhuqun;Xiong Chuanxi
聚合物薄膜电容器由于其在电子和电气系统中的重要应用而引起了人们的广泛关注。然而，日益增长的环境挑战刺激了探索可再生介电材料的巨大需求。本文首次采用直接的低温溶解/再生工艺制备了基于再生几丁质和氮化硼纳米片（BNNSs）的柔性薄膜介电体，该工艺选择了“绿色”KOH/尿素水体系作为几丁质的溶剂和BNNSs的剥离剂。得益于嵌入式BNNS优异的固有特性，该材料的介电性能得到了显著提高，包括大大抑制了介电损耗，并显著提高了击穿强度。特别是，在6 wt% BN负载下，即使施加电场高达400 MV m−1，复合材料也能保持90%以上的超高充放电效率，从而获得8.67 J cm−3的放电能量密度。此外，除了目标优异的介电性能外，合成的复合材料还具有改进的机械和热性能。这一策略不仅拓宽了几丁质的应用范围，而且为建立具有优异介电性能的下一代环境友好型介电材料打开了新的窗口。
Polymer-based film capacitors have attracted considerable attention owing to their important applications in both electronics and electrical systems. However, ever-growing environmental challenges stimulate a great demand for exploring renewable dielectric materials. Herein, flexible film dielectrics based on regenerated chitin and boron nitride nanosheets (BNNSs) were fabricated, for the first time, through a straightforward low-temperature dissolution/regeneration process, in which a “green” KOH/urea aqueous system was chosen as both the solvent of chitin and the exfoliation agent of BNNSs. Benefit from the excellent intrinsic properties of embedded BNNS, substantially elevated dielectric performances were achieved, including much suppressed dielectric loss along with significantly enhanced breakdown strength. Particularly, an ultrahigh charge-discharge efficiency of above 90% could be well-maintained in composites with only 6 wt% BN loading, even the applied electric field up to 400 MV m−1, therefore resulting in a marvelous discharge energy density of 8.67 J cm−3. Furthermore, aside targeted excellent dielectric properties, the resultant composites also possessed improved mechanical and thermal properties. This strategy developed here not only broadens the application of chitin, but also opens a new window for the establishment of next-generation environment-friendly dielectrics with superb dielectric properties.
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