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首页> 外文期刊>RSC Advances >Three-dimensional ordered macroporous ZIF-8 nanoparticle-derived nitrogen-doped hierarchical porous carbons for high-performance lithium–sulfur batteries
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Three-dimensional ordered macroporous ZIF-8 nanoparticle-derived nitrogen-doped hierarchical porous carbons for high-performance lithium–sulfur batteries

机译：用于高性能锂 - 硫磺电池的三维有序大孔ZIF-8纳米粒子衍生的氮气掺杂的等级多孔碳

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Lithium–sulfur (Li–S) batteries have attracted considerable attention due to their ultra-high specific capacity and energy density. However, there are still problems to be resolved such as poor conductivity of sulfur cathodes and dissolution of polysulfides in organic electrolytes. Herein, a novel ZIF-8-derived nitrogen-doped connected ordered macro–microporous carbon (COM-MPC) was developed by a dual solvent-assisted in situ crystallization method within a face-centered cubic stacking sphere template, which acts as an advanced sulfur host for enhanced Li–S battery performance. Compared with the conventional predominant microporous C-ZIF-8, the unique hierarchical macro–microporous structure with nitrogen doping not only renders polysulfide intermediates enhanced entrapment by confining the effect of micropores and chemisorption of doping N atoms, but also facilitates electrolyte accessibility and efficient ion transport owing to the ordered macroporous structure. Benefitting from this, the COM-MPC@S cathode delivers a high initial specific capacity of 1498.5 mA h g ~(?1) and a reversible specific capacity of 1118.9 mA h g ~(?1) . Moreover, the COM-MPC@S cathode exhibits 82.3% of capacity retention within 10th to 50th cycle at 0.5C and a large capacity of 608.5 mA h g ~(?1) after 50 cycles at a higher rate of 1C, and this enhanced cycling stability and rate capability demonstrate great practical application potential in Li–S battery systems.
机译：锂 - 硫（LI-S）电池由于其超高的特定容量和能量密度而引起了相当大的关注。然而，仍有问题仍有待解决的问题，例如硫阴极的不良导电性以及在有机电解质中的多硫化物溶解。在此，通过在面朝式的立方体堆叠球模板内使用双溶解的原位结晶方法进行新的ZIF-8-衍生的氮掺杂连接的宏观微孔碳（COM-MPC），其作为先进的硫磺主机提高LI-S电池性能。与常规主要的微孔C-ZIF-8相比，具有氮掺杂的独特分层宏观微孔结构不仅使多硫化物中间体通过限制微孔和掺杂N原子的化学吸附的效果而增强夹杂物，而且促进了电解质可替代性和有效的离子由于有序的大孔结构而运输。受益于此，COM-MPC @ S阴极可提供1498.5 mA H G〜（？1）的高初始特定容量，可逆的特定容量为1118.9 ma H g〜（？1）。此外，COM-MPC @ S阴极在0.5℃下在10℃至50周期内显示出82.3％的容量保持，并且在50次循环的情况下以较高的1C速度，大容量为608.5 mA Hg〜（α1），并且这种增强型循环稳定性和速率能力在LI-S电池系统中表现出巨大的实际应用潜力。

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