具有分级多孔结构的生物质衍生氮掺杂高孔隙率碳材料用于高性能锂/硫电池

Biomass Derived Nitrogen-Doped Highly Porous Carbon Material with a Hierarchical Porous Structure for High-Performance Lithium/Sulfur Batteries.

作者信息

Zhao Yan, Zhang Xiaomin, He Yusen, Liu Ning, Tan Taizhe, Liang Chunyong

机构信息

School of Materials Science & Engineering, Research Institute for Energy Equipment Materials, Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, China.

Synergy Innovation Institute of GDUT, Heyuan 517000, China.

出版信息

Materials (Basel). 2017 Oct 6;10(10):1158. doi: 10.3390/ma10101158.

DOI:10.3390/ma10101158

PMID:28984818

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5666964/

Abstract

A novel nitrogen doped mesoporous carbon (NMPC) with a hierarchical porous structure is prepared by simple carbonizing the green algae, which is applied as a host material to encapsulate sulfur for lithium/sulfur (Li/S) battery. The NMPC exhibits high pore volume as well as large specific surface area, and thus sulfur content in the S/NMPC composite reaches up to 63 wt %. When tested in a Li/S battery, the S/NMPC composite yields a high initial capacity of 1327 mAh·g as well as 757 mAh·g after 100 cycles at a current rate of 0.1 C, a reversible capacity of 642 was achieved even at 1 C. This good electrochemical performance of the S/NMPC composite could be attributed to a unique combination of mesopority and surface chemistry, allowing for the retention of the intermediate polysuflides within the carbon framework.

摘要

通过简单地碳化绿藻制备了一种具有分级多孔结构的新型氮掺杂介孔碳（NMPC），将其用作宿主材料来封装锂硫电池中的硫。NMPC具有高孔容和大比表面积，因此S/NMPC复合材料中的硫含量高达63 wt%。在锂硫电池中测试时，S/NMPC复合材料在0.1 C的电流速率下具有1327 mAh·g的高初始容量以及100次循环后的757 mAh·g，即使在1 C时也能实现642的可逆容量。S/NMPC复合材料这种良好的电化学性能可归因于介孔性和表面化学的独特组合，使得中间多硫化物能够保留在碳骨架内。