Department of Electrical and Computer Engineering, Kettering University, Flint, MI-48504, USA.
School of Science, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, Xi'an Jiaotong University, Xi'an, 710049, China.
Sci Rep. 2018 Jan 25;8(1):1602. doi: 10.1038/s41598-018-19787-z.
Lithium ion capacitors possess an ability to bridge the gap between lithium ion battery and supercapacitor. The main concern of fabricating lithium ion capacitors is poor rate capability and cyclic stability of the anode material which uses sluggish faradaic reactions to store an electric charge. Herein, we have fabricated high performance hybrid anode material based on carbon nanofibers (CNFs) and cobalt-nickel sulfide (CoNiS) nanoparticles via simple electrospinning and electrodeposition methods. Porous and high conducting CNF@CoNiS electrode acts as an expressway network for electronic and ionic diffusion during charging-discharging processes. The effect of anode to cathode mass ratio on the performance has been studied by fabricating lithium ion capacitors with different mass ratios. The surface controlled contribution of CNF@CoNiS electrode was 73% which demonstrates its excellent rate capability. Lithium ion capacitor fabricated with CNF@CoNiS to AC mass ratio of 1:2.6 showed excellent energy density of 85.4 Wh kg with the power density of 150 W kg. Also, even at the high power density of 15 kW kg, the cell provided the energy density of 35 Wh kg. This work offers a new strategy for designing high-performance hybrid anode with the combination of simple and cost effective approaches.
锂离子电容器具有弥合锂离子电池和超级电容器之间差距的能力。制造锂离子电容器的主要关注点是阳极材料的倍率性能和循环稳定性差，其使用缓慢的法拉第反应来存储电荷。在此，我们通过简单的静电纺丝和电沉积方法制备了基于碳纳米纤维（CNF）和钴-镍硫化物（CoNiS）纳米粒子的高性能混合阳极材料。多孔且高导电性的 CNF@CoNiS 电极在充放电过程中充当电子和离子扩散的高速公路网络。通过制备不同质量比的锂离子电容器研究了阳极与阴极质量比对性能的影响。CNF@CoNiS 电极的表面控制贡献为 73%，这表明其具有优异的倍率性能。以 CNF@CoNiS 与 AC 的质量比为 1:2.6 制备的锂离子电容器具有 85.4 Wh kg 的优异能量密度，功率密度为 150 W kg。此外，即使在 15 kW kg 的高功率密度下，电池也能提供 35 Wh kg 的能量密度。这项工作为通过简单且具有成本效益的方法相结合设计高性能混合阳极提供了一种新策略。
