In Situ CVD Derived Co–N–C Composite as Highly Efficient Cathode for Flexible Li–O2 Batteries,Small

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In Situ CVD Derived Co–N–C Composite as Highly Efficient Cathode for Flexible Li–O2 Batteries
Small ( IF 13.0 ) Pub Date : 2018-07-25 , DOI: 10.1002/smll.201800590
Zhen-Dong Yang _{1,

2} , Xiao-Yang Yang _{1,

2} , Tong Liu ₂ , Zhi-Wen Chang _{2,

3} , Yan-Bin Yin _{1,

2} , Xin-Bo Zhang ₂ , Jun-Min Yan ₁ , Qing Jiang ₁

Affiliation

To promote the development of high energy Li–O₂ batteries, it is important to design and construct a suitable and effective oxygen‐breathing cathode. Herein, activated cobalt‐nitrogen‐doped carbon nanotube/carbon nanofiber composites (Co‐N‐CNT/CNF) as the effective cathodes for Li–O₂ batteries are prepared by in situ chemical vapor deposition (CVD). The unique architecture of these electrodes facilitates the rapid oxygen diffusion and electrolyte penetration. Meanwhile, the nitrogen‐doped carbon nanotube/carbon nanofiber (N‐CNT/CNF) and Co/CoN_x serve as reaction sites to promote the formation/decomposition of discharge product. Li–O₂ batteries with Co‐N‐CNT/CNF cathodes exhibit superior electrochemical performance in terms of a positive discharge plateau (2.81 V) and a low charge overpotential (0.61 V). Besides, Li–O₂ batteries also present a high discharge capacity (11512.4 mAh g⁻¹ at 100 mA g⁻¹), and a long cycle life (130 cycles). Meanwhile, the Co‐N‐CNT/CNF cathode also has an excellent flexibility, thus the assembled flexible battery with Co‐N‐CNT/CNF can work normally and hold a wonderful capacity rate under various bending conditions.

中文翻译：

原位CVD衍生的Co-N-C复合材料，作为柔性Li-O2电池的高效阴极

为了促进高能Li–O ₂电池的发展，设计和构造合适且有效的吸氧阴极非常重要。在此，通过原位化学气相沉积（CVD）制备了活化的钴氮掺杂碳纳米管/碳纳米纤维复合材料（Co-N-CNT / CNF）作为Li-O ₂电池的有效阴极。这些电极的独特结构促进了氧气的快速扩散和电解质的渗透。同时，氮掺杂的碳纳米管/碳纳米纤维（N-CNT / CNF）和Co / CoN _x作为反应部位，促进了放电产物的形成/分解。Li–O ₂具有Co-N-CNT / CNF阴极的电池在正放电平稳段（2.81 V）和低电荷过电势（0.61 V）方面表现出卓越的电化学性能。此外，黎-O ₂电池也呈现出高的放电容量（毫安11512.4克^-1在100mA克^-1），以及长的循环寿命（130个循环）。同时，Co-N-CNT / CNF阴极也具有出色的柔韧性，因此使用Co-N-CNT / CNF组装的柔性电池可以正常工作，并在各种弯曲条件下保持出色的容量率。

更新日期：2018-07-25

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