多硫化物
法拉第效率
杂原子
硫黄
碳纤维
阴极
材料科学
电化学
锂(药物)
电导率
化学工程
聚苯胺
气凝胶
碳化
复合数
化学
电极
纳米技术
复合材料
有机化学
电解质
扫描电子显微镜
医学
戒指(化学)
物理化学
聚合
聚合物
工程类
冶金
内分泌学
作者
Mengmeng Hou,Kai Chen,Guodong Zhang,Xin Liang,Xingfa Liu,Shuangxi Xing
标识
DOI:10.1016/j.est.2023.108339
摘要
The practical application of lithium-sulfur (LiS) batteries is impeded by the shuttle effect and slow redox reaction kinetics, resulting in rapid capacity decay and low Coulombic efficiency. Three dimensional (3D) carbon-based network structure is used as sulfur host due to its special properties, such as high porosity and high conductivity. In this work, 3D MnO2/N, P co-doped carbon (3D MnO2/NPC) composites were achieved via freeze-drying MnO2/polyaniline composite aerogel followed by carbonizing process. The strongly polar MnO2 skeleton can provide sufficient adsorption capacity to anchor polysulfide and the heteroatom-doped carbon can compensate for the poor conductivity of MnO2 to guarantee the participation of rapid electrochemical reactions. As a result, the MnO2/NPC/S cathode demonstrates an initial specific discharge capacity of 1189 mAh g−1 at 0.2 C and a high rate capability of 569.2 mAh g−1 at 5 C, as well as excellent long-term cycling performance with the capacity decay rate of 0.033 % per cycle for 1000 cycles at 1 C. Moreover, the cathode exhibits excellent cycling stability even at a high sulfur loading of 6 mg cm−2.
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