High-energy flexible solid-state supercapacitors based on O, N, S-tridoped carbon electrodes and a 3.5 V gel-type electrolyte
High-energy flexible solid-state supercapacitors based on O, N, S-tridoped carbon electrodes and a 3.5 V gel-type electrolyte
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基于 O、N、S 三掺杂碳电极和 3.5 V 凝胶型电解质的高能柔性固态超级电容器
DOI：
10.1016/j.cej.2019.05.019
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发表时间：
2019
影响因子：
15.1
通讯作者：
Gan Lihua
中科院分区：
文献类型：
--
作者：
Song Ziyang;Duan Hui;Li Liangchun;Zhu Dazhang;Cao Tongcheng;Lv Yaokang;Xiong Wei;Wang Zhiwei;Liu Mingxian;Gan Lihua
开发先进的电极和电解质是提高超级电容器能量输出的两种基本策略，但之前的研究通常局限于只关注一种成分。在此，我们报告了高性能的O，N，S-三掺杂碳（ONSC）电极和高电压多孔凝胶电解质的设计，以构建高能量的柔性固态超级电容器。首先，基于新颖且简单的苯醌-硫脲路线合成具有富集杂原子（14.85重量%）的高表面积（2917 m2 g-1）ONSC，以实现上级电化学电容能力。第二，利用高度多孔的凝胶聚合物来支撑1-乙基-3-甲基咪唑四氟硼酸盐（EMIMBF 4）的离子液体，用于制造3.5V离子凝胶电解质。精心制作的ONSC电极和EMIMBF 4凝胶电解质使所得的固态超级电容器具有90.9 Wh kg−1的极高能量供应，沿着具有优异的循环性能（超过10，000次循环的91.6%）和温度稳定性（0-80 °C）。此外，组装的柔性固态器件提供76.6 Wh kg−1的能量密度，即使在180°的弯曲角度下也表现出90%的高柔性。这项工作提出了一种电极/电解质工程原理，以实现高效的能量存储。
Developing advanced electrodes and electrolytes are two basic strategies to boost the energy outputs of supercapacitors, but previous studies are generally constrained to the point where only one component is focused. Herein, we report the design of high-performance O, N, S-tridoped carbon (ONSC) electrodes and a high-voltage porous gel electrolyte to construct high-energy flexible solid-state supercapacitors. First, high-surface-area (2917 m2g−1) ONSCs with enriched heteroatoms (14.85 wt%) are synthesized based on a novel and simple benzoquinone-thiourea route to achieve a superior electrochemical capacitive capability. Second, a highly porous gel polymer is utilized to support ionic liquid of 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIMBF4) for fabricating a 3.5 V ionogel electrolyte. The elaborated ONSC electrode and EMIMBF4gel electrolyte enable the resultant solid-state supercapacitor with an extremely energy supply of 90.9 Wh kg−1, along with excellent cyclability (91.6% over 10,000 cycles) and temperature robustness (0–80 °C). Besides, an assembled flexible solid-state device delivers an energy density of 76.6 Wh kg−1, and manifests high flexibility with 90% retention even under a bending angle of 180°. This work presents an electrode/electrolyte engineering principle to achieve highly efficient energy storage.