In‐Plane Assembled Orthorhombic Nb2O5 Nanorod Films with High‐Rate Li+ Intercalation for High‐Performance Flexible Li‐Ion Capacitors,Advanced Functional Materials

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In‐Plane Assembled Orthorhombic Nb2O5 Nanorod Films with High‐Rate Li+ Intercalation for High‐Performance Flexible Li‐Ion Capacitors
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-11-28 , DOI: 10.1002/adfm.201704330
Bohua Deng ₁ , Tianyu Lei ₁ , Weihua Zhu ₁ , Liang Xiao ₁ , Jinping Liu _{1,

2}

Affiliation

Organic hybrid supercapacitors that consist of a battery electrode and a capacitive electrode show greatly improved energy density, but their power density is generally limited by the poor rate capability of battery‐type electrodes. In addition, flexible organic hybrid supercapacitors are rarely reported. To address the above issues, herein an in‐plane assembled orthorhombic Nb₂O₅ nanorod film anode with high‐rate Li⁺ intercalation to develop a flexible Li‐ion hybrid capacitor (LIC) is reported. The binder‐/additive‐free film exhibits excellent rate capability (≈73% capacity retention with the rate increased from 0.5 to 20 C) and good cycling stability (>2500 times). Kinetic analyses reveal that the high rate performance is mainly attributed to the excellent in‐plane assembly of interconnected single‐crystalline Nb₂O₅ nanorods on the current collector, ensuring fast electron transport, facile Li‐ion migration in the porous film, and greatly reduced ion‐diffusion length. Using such a Nb₂O₅ film as anode and commercial activated carbon as cathode, a flexible LIC is designed. It delivers both high gravimetric and high volumetric energy/power densities (≈95.55 Wh kg⁻¹/5350.9 W kg⁻¹; 6.7 mW h cm⁻³/374.63 mW cm⁻³), surpassing previous typical Li‐intercalation electrode‐based LICs. Furthermore, this LIC device still keeps good electrochemical attributes even under serious bending states (30°–180°).

中文翻译：

具有高性能Li +插层的平面正交Nb2O5纳米棒状平面组装膜，用于高性能柔性锂离子电容器

由电池电极和电容电极组成的有机混合超级电容器显示出大大提高的能量密度，但是它们的功率密度通常受到电池型电极差的倍率能力的限制。另外，很少有柔性有机混合超级电容器的报道。为了解决上述问题，本文采用面内组装的高速率Li ⁺正交Nb ₂ O ₅纳米棒薄膜正交阳极据报道，开发了一种可伸缩的锂离子混合电容器（LIC）。无粘合剂/无添加剂的薄膜具有出色的速率能力（速率保持率从0.5升高至20 C时≈73％的容量保持率）和良好的循环稳定性（> 2500倍）。动力学分析表明，高倍率性能主要归因于在集电器上互连的单晶Nb ₂ O ₅纳米棒的出色面内组装，从而确保了快速的电子传输，多孔膜中锂离子的便捷迁移，并且在很大程度上减少离子扩散长度。使用这样的Nb ₂ O ₅薄膜为阳极，商用活性炭为阴极，设计了柔性LIC。它提供高重量和高体积能量/功率密度（≈95.55Wh kg ^-1 /5350.9 W kg ^-1 ; 6.7 mW h cm ^-3 /374.63 mW cm ^-3），超过了以前的典型基于锂离子嵌入电极的LIC 。此外，即使在严重的弯曲状态（30°–180°）下，该LIC装置仍保持良好的电化学性能。

更新日期：2017-11-28

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