Using ethylenediamine to prepare three dimensional nitrogen-doped graphene aerogel/sulfur composite for lithium-sulfur batteries

被引:39
作者
Kang, Jia-Hao [1 ]
Chen, Jenn-Shing [1 ]
机构
[1] Natl Univ Kaohsiung, Dept Appl Chem, Kaohsiung 811, Taiwan
关键词
Graphene; Aerogel; Lithium-sulfur battery; Ethylenediamine; HYDROTHERMAL SYNTHESIS; CATHODE MATERIAL; PERFORMANCE; NANOPARTICLES; NANOFIBERS; STORAGE; OXIDE; ION;
D O I
10.1016/j.diamond.2018.07.015
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Three-dimensional nitrogen-doped graphene aerogel/sulfur (NGA/S) composites are studied for use as cathode materials in Li-S batteries. The NGA/S composites are fabricated using ethylenediamine (EDA) as a nitrogen source and 3D graphene structural modifier through a combination of one-pot hydrothermal and heat melt diffusion methods. The as-prepared NGA/S composites present a porous 3D interconnected network structure with a high sulfur loading of 77.3 wt%. The electrode with NGA/S as cathode delivers a high initial discharge capacity of 1258 mAh g(-1) at a current rate of 0.1 C and maintains a stable capacity of 1077 mAh g(-1) after 75 cycles. This high battery capacity and good cycle stability is primarily attributed to the flexible porous 3D structure and N-doping in graphene for this NGA/S structural design which can provide higher sulfur loading, faster charge transfer pathway and better immobilization of lithium polysulfides. The present study demonstrates that the 3D NGA/S composite is a promising material for application as the cathode in Li-S batteries.
引用
收藏
页码:222 / 229
页数:8
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