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首页> 外文期刊>Electrochimica Acta >Improved Electrochemical Performance of Biomass-Derived Nanoporous Carbon/Sulfur Composites Cathode for Lithium-Sulfur Batteries by Nitrogen Doping
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Improved Electrochemical Performance of Biomass-Derived Nanoporous Carbon/Sulfur Composites Cathode for Lithium-Sulfur Batteries by Nitrogen Doping

机译：氮掺杂改善了生物质衍生的纳米多孔碳/硫复合材料正极材料对锂硫电池的电化学性能

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摘要

A two-step method with high-efficiency is developed to prepare nitrogen doped activated carbons (NACs) with high surface area and nitrogen content. Based on the method, series of NACs with similar surface area and pore texture but different nitrogen content and nitrogen group species are successfully prepared. The influence of nitrogen doping on electrochemical performance of carbon/sulfur composites cathode is studied deeply under the conditions of similar surface area and pore texture. It presents the directly experimental demonstration that both nitrogen content and nitrogen group species play crucial roles on electrochemical performance of carbon/sulfur composites cathode. NAC/sulfur composites show the much improved cycling performance, which is about 3.5 times as that of nitrogen free carbon. Improved electrochemical performance is due to synergistic effects between nitrogen content and effective nitrogen groups, which enables effective trapping of lithium polysulfides within carbon framework. Besides, it is found that oxygen groups exist in carbon materials obviously influence electrochemical performance of cathode, which could be ignored in most of studies. Based on above, it can be concluded that enhanced chemisorption to lithium polysulfides by functional groups modification is the effective route to improve the electrochemical performance of Li-S battery. (C) 2016 Elsevier Ltd. All rights reserved.
机译：开发了一种高效的两步法来制备具有高表面积和氮含量的掺氮活性炭（NAC）。基于该方法，成功制备了一系列表面积和孔结构相似，氮含量和氮基种类不同的NAC。在相似的表面积和孔结构的条件下，深入研究了氮掺杂对碳/硫复合材料阴极电化学性能的影响。它提供了直接的实验证明，氮含量和氮基种类对碳/硫复合材料阴极的电化学性能都起着至关重要的作用。 NAC /硫磺复合材料显示出大大改善的循环性能，约为无氮碳的3.5倍。改善的电化学性能归因于氮含量和有效氮基团之间的协同效应，从而可以将多硫化锂有效捕集在碳骨架中。此外，发现碳材料中存在的氧基团明显影响阴极的电化学性能，这在大多数研究中都可以忽略。基于以上所述，可以得出结论，通过官能团修饰增强对多硫化锂的化学吸附是改善Li-S电池电化学性能的有效途径。 （C）2016 Elsevier Ltd.保留所有权利。

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