Novel Potassium-Ion Hybrid Capacitor Based on an Anode of K2Ti6O13 Microscaffolds
Novel Potassium-Ion Hybrid Capacitor Based on an Anode of K2Ti6O13 Microscaffolds
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DOI：
10.1021/acsami.7b15314
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发表时间：
2018-05-09
影响因子：
9.5
通讯作者：
Zhang, Xiaogang
中科院分区：
文献类型：
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作者：
Dong, Shengyang;Li, Zhifei;Zhang, Xiaogang
为了填补电池和超级电容器之间的空白，需要在一个系统中集成以下特征：能量密度远高于超级电容器，循环寿命远长于锂离子电池，成本低。沿着这条线，我们报道了一种新的非水钾离子杂化电容器（KIC），该电容器采用由纳米棒构建的K2Ti6O13 （KTO）微支架阳极和n掺杂纳米多孔石墨碳（NGC）阴极。本文首次研究了K2Ti6O13微支架作为负极材料在钾离子存储中的潜在应用。这种材料在1000次循环后的容量保持率为85%。此外，NGC//KTO KIC可提供58.2 Wh kg（-1）的高能量密度（基于两个电极的活性质量），7200 W kg（-1）的高功率密度，以及超过5000次循环的出色循环稳定性。使用K离子作为负极电荷载体而不是Li离子，以及该器件的可适应性能表明，混合电容器器件可能迎来一个超越锂的新时代。
To fill the gap between batteries and supercapacitors requires integration of the following features in a single system: energy density well above that of supercapacitors, cycle life much longer than Li-ion batteries, and low cost. Along this line, we report a novel nonaqueous potassium-ion hybrid capacitor (KIC) that employs an anode of K2Ti6O13 (KTO) microscaffolds constructed by nanorods and a cathode of N-doped nanoporous graphenic carbon (NGC). K2Ti6O13 microscaffolds are studied for potential applications as the anode material in potassium-ion storage for the first time. This material exhibits an excellent capacity retention of 85% after 1000 cycles. In addition, the NGC//KTO KIC delivers a high energy density of 58.2 Wh kg(-1) based on the active mass in both electrodes, high power density of 7200 W kg(-1), and outstanding cycling stability over 5000 cycles. The usage of K ions as the anode charge carrier instead of Li ions and the amenable performance of this device suggest that hybrid capacitor devices may welcome a new era of beyond lithium.