High Sulfur Loading in Hierarchical Porous Carbon Rods Constructed by Vertically Oriented Porous Graphene-Like Nanosheets for Li-S Batteries
High Sulfur Loading in Hierarchical Porous Carbon Rods Constructed by Vertically Oriented Porous Graphene-Like Nanosheets for Li-S Batteries
复制标题
用于锂硫电池的垂直取向多孔类石墨烯纳米片构建的分级多孔碳棒的高硫负载量
DOI：
10.1002/adfm.201601897
复制
发表时间：
2016
影响因子：
19
通讯作者：
Zheng Nanfeng
中科院分区：
文献类型：
--
作者：
Zheng Zongmin;Guo Hongchen;Pei Fei;Zhang Xin;Chen Xinyi;Fang Xiaoliang;Wang Taihong;Zheng Nanfeng
利用多孔碳框架作为硫负载的主体是当前Li-S电池研究中的重要主题。不幸的是，绝缘硫的高负载量通常导致低比容量、差倍率性能和快速容量损失。为了解决这一挑战，提出了一种简单的模板路线来制造新型主体材料，由垂直取向的多孔石墨烯样纳米片（HPCR）构建的分级多孔碳棒。HPCR具有高比表面积、超大孔体积、分级多孔结构和理想的离子转移途径，是高硫负载的有希望的候选者。当用作硫阴极的活性材料时，具有78.9wt%硫的HPCR-S复合材料表现出优异的倍率性能（5C下646 mAh g− 1硫）和循环稳定性（1C下300次循环后700 mAh g− 1硫）。即使硫含量为88.8wt%，HPCR-S复合材料在没有任何额外的保护性聚合物涂层的情况下，仍然提供良好的倍率性能（3C下545 mAh g− 1硫）和循环稳定性（1C下200次循环后632 mAh g− 1硫）。更重要的是，高硫负载（88.8重量%）确保HPCR-S复合材料具有高能量密度（在1C下200次循环后，阴极为880 mAh cm− 3）。
The utilization of porous carbon frameworks as hosts for sulfur loading is an important theme in current Li‐S battery research. Unfortunately, the high loading of insulating sulfur often leads to low specific capacities, poor rate properties, and rapid capacity loss. To address this challenge, a facile templating route to fabricate a novel host material, hierarchical porous carbon rods constructed by vertically oriented porous graphene‐like nanosheets (HPCR) is presented. With a high specific surface area, ultralarge pore volume, hierarchical porous structures, and ideal ion transfer pathways, HPCR is a promising candidate for high sulfur loading. When used as the active material for a sulfur cathode, the HPCR‐S composite with 78.9 wt% sulfur exhibits excellent rate performance (646 mAh g−1sulfurat 5 C) and cycling stability (700 mAh g−1sulfurafter 300 cycles at 1 C). Even with a sulfur content of 88.8 wt%, the HPCR‐S composite, without any additional protective polymer coating, still delivers a good rate performance (545 mAh g−1sulfurat 3 C) and cycling stability (632 mAh g−1sulfurafter 200 cycles at 1 C). More importantly, the high sulfur loading (88.8 wt%) ensures that the HPCR‐S composite has a high energy density (880 mAh cm−3cathodeafter 200 cycles at 1 C).