高性能全固态超级电容器用木材衍生的多层多孔电极,Advanced Functional Materials

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高性能全固态超级电容器用木材衍生的多层多孔电极
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-11-09 , DOI: 10.1002/adfm.201806207
Yameng Wang ₁ , Xiangjun Lin ₁ , Ting Liu ₁ , Heng Chen ₁ , Shuai Chen ₂ , Zhongjie Jiang ₁ , Jiang Liu ₁ , Jianlin Huang ₁ , Meilin Liu ₃

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许多新兴技术（例如，电动汽车和智能电网）的飞速发展需要先进的储能和转换系统，这些系统具有更高的能量和功率密度，更长的使用寿命以及更好的安全性。一种低成本，绿色且可持续的全固态不对称超级电容器（ASC）的制造工艺，该超级电容器由分层多孔的碳化木（CW）阳极，纤维素纸隔板和Co（OH）₂ @CW阴极组成在这里报道。的分级多孔木材衍生的电极表现出的3.723厘米˚F高面积电容^-2（具有面积负荷的Co（OH）₂的5.7毫克厘米^-2在电流密度）1.0毫安厘米^-2，和1.568˚F厘米^{- 2个}在30 mA cm ^-2的电流密度下。此外，全固态ASC在1.126 W cm ^-2（17.75 W kg ^-1）的功率密度下表现出出色的能量密度0.69 mWh cm ^-2（10.87 Wh kg ^-1），同时保持了85％的电容经过1万次连续充放电循环后。高能量/功率密度归因于天然木材电极的独特结构，可充分暴露活性电极材料，有效收集电流并快速进行离子迁移。此外，材料是可再生的，环境友好的和可生物降解的。

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Wood‐Derived Hierarchically Porous Electrodes for High‐Performance All‐Solid‐State Supercapacitors

The rapid development of many emerging technologies (e.g., electric vehicles and smart grids) requires advanced energy storage and conversion systems that have higher energy and power density, longer operational life, and better safety. A low‐cost, green, and sustainable process for fabrication of all‐solid‐state asymmetric supercapacitors (ASC) composed of a hierarchically porous carbonized wood (CW) anode, a cellulose paper separator, and a Co(OH)₂@CW cathode is reported here. The hierarchically porous wood‐derived electrode exhibits a high areal capacitance of 3.723 F cm⁻² (with an areal loading Co(OH)₂ of 5.7 mg cm⁻²) at a current density 1.0 mA cm⁻², and 1.568 F cm⁻² at a current density of 30 mA cm⁻². Moreover, the all‐solid‐state ASC exhibits outstanding energy density of 0.69 mWh cm⁻² (10.87 Wh kg⁻¹) at power density of 1.126 W cm⁻² (17.75 W kg⁻¹) while maintaining a capacitance retention of 85% after 10 000 continuous charge–discharge cycles. The high energy/power‐densities are attributed to the unique architecture of the electrodes derived from natural wood, which allow full exposure of active electrode materials, efficient current collection, and fast ion transport. Further, the materials are renewable, environmentally friendly, and biodegradable.

更新日期：2018-11-09

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