Controllable Assembly of Hybrid Electrodes by Electrophoretic Deposition for High-Performance Battery–Supercapacitor Hybrid Devices,ACS Applied Energy Materials

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Controllable Assembly of Hybrid Electrodes by Electrophoretic Deposition for High-Performance Battery–Supercapacitor Hybrid Devices
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-06 00:00:00 , DOI: 10.1021/acsaem.9b02242
Yu Ouyang ₁ , Ori Geuli ₂ , Qingli Hao ₁ , Daniel Mandler ₂

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Hybrid electrodes, which are made of a physical (electrical double layer) storage component and a chemical (battery-type) material, have shown great potential in battery–supercapacitor hybrid (BSH) devices. Here, we present an approach which is based on electrophoretic deposition (EPD) as a means of assembling a binder-free, high-performance BSH device. Ketjenblack (KB) used as the physical storage material and NiCo₂O₄ (NCO) as the chemical storage compound were dispersed in the presence of Ni²⁺. The latter assisted in positively charging the surface of both materials and thus resulted in similar deposition rates by EPD on nickel foam (NF). This enabled us to nicely control the NCO to KB ratio in the hybrid electrode and optimize its performance. In this binder-free hybrid electrode, the KB chains served as a fast electron path providing high conductivity for the NCO electroactive material. More importantly, the KB chains could remain in contact with NCO coping with the mechanical stress during the electrochemical reaction. As a result, the optimized hybrid electrode showed high specific capacity (460 C g^–1 at 1 A g^–1) and excellent cycling performance (82.5% retention after 15 000 cycles). The BSH device was assembled with the hybrid electrode (NF/NCO-KB) as positive and activated carbon as negative electrodes, and exhibited high energy density of 53.0 Wh kg^–1 at power density of 746 W kg^–1 and outstanding cycling performance of 88.6% retention after 10 000 cycles.

中文翻译：

电泳沉积可控制组装的高性能电池-超级电容器混合装置的混合电极

由物理（双电层）存储组件和化学（电池型）材料制成的混合电极在电池-超级电容器混合（BSH）装置中显示出巨大的潜力。在这里，我们提出一种基于电泳沉积（EPD）的方法，作为组装无粘合剂，高性能BSH器件的一种手段。在Ni ²⁺的存在下，将Ketjenblack（KB）用作物理存储材料，将NiCo ₂ O ₄（NCO）用作化学存储化合物。后者有助于使两种材料的表面带正电，因此通过EPD在镍泡沫（NF）上产生了相似的沉积速率。这使我们能够很好地控制混合电极中NCO与KB的比例并优化其性能。在这种无粘合剂的混合电极中，KB链充当快速电子路径，为NCO电活性材料提供了高电导率。更重要的是，KB链可以保持与NCO接触，以应对电化学反应期间的机械应力。其结果，最优化的混合电极显示出高的比容量（460℃克^-1 1 A G ^-1）和出色的循环性能（15 000次循环后保留率82.5％）。BSH装置以混合电极（NF / NCO-KB）为正极，活性炭为负极，组装后，在746 W kg ^–1的功率密度下显示出53.0 Wh kg ^–1的高能量密度，并具有出色的循环性能。 10000次循环后保留率达88.6％。

更新日期：2020-01-06

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