Water-processable cellulosic nanocomposites as green dielectric films for high-energy storage
Water-processable cellulosic nanocomposites as green dielectric films for high-energy storage
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可水处理的纤维素纳米复合材料作为高能量存储的绿色介电薄膜
DOI：
10.1016/j.ensm.2022.03.047
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发表时间：
2022
影响因子：
20.4
通讯作者：
Dichiara, Anthony B.
中科院分区：
文献类型：
--
作者：
Goodman, Sheila M.;Che, Junjin;Neri, Wilfrid;Yuan, Jinkai;Dichiara, Anthony B.
随着化石资源的枯竭和能源需求的不断增加，解决可再生介电材料可持续路线的全球挑战变得至关重要，这种材料可以静电存储能量，用于柔性电子和脉冲功率应用。在此，合成了具有定制电荷密度的 TEMPO 氧化纤维素纳米纤维，并使用无毒水作为溶剂与胶体聚偏二氟乙烯纳米颗粒混合，以生产柔性透明介电薄膜。对所制备的纳米材料和所得复合薄膜进行了广泛的表征。与其他生物聚合物和陶瓷电介质相比，夹在两个薄聚乙烯醇层之间的纤维素基纳米复合材料在击穿强度为 388 MV·m−1 时实现了 7.22 J·cm−3 的高能量密度。此外，层状复合材料中存储的能量以1.60微秒的速率释放，在300 MW·m−1的施加场下经过1000次充放电循环产生~3 MW·cm−3的稳定功率密度，比双向拉伸聚丙烯高十倍以上。值得注意的是，这些发现为天然材料的环保加工应用于柔性和透明的能量存储设备铺平了道路。
With the depletion of fossil resources and the ever-increasing energy demand, it becomes crucial to address the global challenge of sustainable routes to renewable dielectric materials, which can store energy electrostatically for flexible electronics and pulsed power applications. Here, TEMPO-oxidized cellulose nanofibrils with tailored charge density are synthesized and mixed with colloidal poly(vinylidene fluoride) nanoparticles using nontoxic water as solvent to produce flexible and transparent dielectric films. The as-prepared nanomaterials and resulting composite films were extensively characterized. Compared to other biopolymer and ceramic dielectrics, the cellulose-based nanocomposites sandwiched between two thin polyvinyl alcohol layers achieve a high energy density of 7.22 J·cm−3at breakdown strength of 388 MV·m−1. Furthermore, the stored energy in the laminated composite is released at a rate of 1.60 microseconds, yielding a stable power density of ∼3 MW·cm−3under an applied field of 300 MW·m−1over 1000 charge/discharge cycles, which is more than ten times greater than that of biaxially-oriented polypropylene. Significantly, these findings pave the way toward environmentally-benign processing of naturally-derived materials for applications in flexible and transparent energy storage devices.