Li-ion hybrid capacitors (LIHC) are becoming a prospective candidate for energy storage and can achieve high energy density and power density at the same time. As it uses a battery-type anode, improving its sluggish charge–discharge mechanism becomes important in the LIHC study. Herein, we report a solvothermal method to fabricate Co@N-doped carbon frameworks anchored to graphene (Co-NCF/G) as an anode material for LIHC. Co nanoparticles are generated in the heterohedral carbon matrix with N-doping, and the heterohedral Co@N-doped carbon frameworks were uniformly decorated within three-dimensional (3D) graphene networks. The existence of Co ultrafine nanoparticles and N element can greatly increase the conductivity of Co-NCF/G, and thus strengthen its electrochemical properties. Moreover, the high surface area and effective pore structure formed by graphene networks can shorten the Li-ion transfer route, enhancing the reaction kinetics of the electrode. The device assembled using Co-NCF/G as the anode and active carbon as the cathode exhibits a high specific capacity of 579.5 mAh g^–1 after 100 cycles at a current density of 0.5 A g^–1, and also delivers a high energy density of 77.17 Wh kg^–1 at a high power density of 6801 W kg^–1 and long cycling stability with an energy retention of 78.7% after 2000 cycles at a high current density of 5.0 A g^–1.

中文翻译：

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Co @ N掺杂碳骨架固定在石墨烯上，作为高级锂离子混合电容器的高速率和长寿命阳极材料

锂离子混合电容器（LIHC）正在成为能量存储的潜在候选者，并且可以同时实现高能量密度和功率密度。由于它使用电池型阳极，因此改善其缓慢的充放电机理在LIHC研究中变得很重要。在这里，我们报道了一种溶剂热法来制造锚固在石墨烯上的Co @ N掺杂碳骨架（Co-NCF / G）作为LIHC的阳极材料。Co纳米颗粒在N掺杂的杂面体碳基体中生成，并且在3维（3D）石墨烯网络中均匀地装饰了杂面Co @ N掺杂的碳骨架。Co超细纳米颗粒和N元素的存在可以大大提高Co-NCF / G的电导率，从而增强其电化学性能。此外，石墨烯网络形成的高表面积和有效的孔结构可以缩短锂离子的转移路径，提高电极的反应动力学。使用Co-NCF / G作为阳极并使用活性炭作为阴极组装的设备显示出579.5 mAh g的高比容量^-1以0.5 g的电流密度在100次循环之后^-1，并且还提供77.17瓦公斤的高能量密度^-1处的6801千克w ^高功率密度^-1和长循环稳定性的78.7的能量保持在5.0 A g ^–1的高电流密度下经过2000次循环后的％。