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Vertically Aligned N-doped Carbon Nanotubes Arrays as Efficient Binder-free Catalysts for Flexible Li-CO2 Batteries
Energy Storage Materials ( IF 18.9 ) Pub Date : 2020-11-15 , DOI: 10.1016/j.ensm.2020.11.020
Xuelian Li , Junxiang Zhang , Guicai Qi , Jianli Cheng , Bin Wang

The Li-CO2 battery is a newly-emerging energy storage and conversion system, making CO2 renewable utilization and capture in a green way. However, the unsatisfactory electrochemical performances such as high polarization, short cyclic life and poor rate capability caused by the sluggish decomposition the product Li2CO3 and the lacking of mechanical flexibility due to the rigid cathode, greatly hinder its real application, especially for the compliant and wearable devices. Herein, the vertically aligned N-doped carbon nanotube (VA-NCNT) arrays on Ti wire are prepared as freestanding, binder-free cathodes for flexible quasi-solid-state Li-CO2 battery. The VA-NCNT arrays have thousands of vertical CNT with high N-doping percentage, rich defects and void space, which facilitate the CO2 diffusion and electrolyte permeation, provide exposed active sites and more space for the formation and accommodation of Li2CO3 and help the oxidation of Li2CO3 and amorphous carbon in charge process. As a result, the fabricated battery shows ultralong cycle life, small potential gap, outstanding rate capability and high flexibility. Our work provides an alternative option towards CO2 conversion and utilization as high performance energy sources.



中文翻译:

垂直排列的N掺杂碳纳米管阵列作为柔性Li-CO 2电池的高效无粘结剂催化剂

Li-CO 2电池是一种新兴的能量存储和转换系统,使CO 2可再生利用并以绿色方式捕获。然而,由于Li 2 CO 3产物的分解缓慢而导致电化学性能不理想,如极化率高,循环寿命短和倍率性能差,以及由于刚性阴极而导致的机械柔韧性不足,极大地阻碍了其实际应用,特别是对兼容且可穿戴的设备。在此,将Ti线上的垂直排列的N掺杂碳纳米管(VA-NCNT)阵列制备为用于柔性准固态Li-CO 2的独立无粘结剂阴极电池。VA-NCNT阵列具有成千上万的垂直CNT,具有较高的N掺杂百分比,丰富的缺陷和空隙空间,这有助于CO 2扩散和电解质渗透,提供了暴露的活性位点,并为Li 2 CO 3的形成和容纳提供了更多空间。并在充电过程中帮助Li 2 CO 3和非晶碳氧化。结果,制成的电池显示出超长的循环寿命,小的电势差,出色的倍率能力和高柔韧性。我们的工作提供了向CO的替代选项2转换和利用作为高性能能源。

更新日期:2020-11-22
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