Ultrahighly nitrogen-doped hollow carbon spheres with hierarchical pores for highly reversible lithium-sulfur batteries

被引：11

作者：

Zeng, Qingkai ^{[1
]}

Li, Xiaolan ^{[1
]}

Zhu, Jinliang ^{[1
]}

Wang, Guifang ^{[1
]}

Chen, Xiyong ^{[1
]}

Ma, Shaojian ^{[1
]}

Shen, Pei Kang ^{[1
]}

机构：

[1] Guangxi Univ, Collaborat Innovat Ctr Sustainable Energy Mat, Sch Resources Environm & Mat, Guangxi Key Lab Proc Nonferrous Met & Featured Ma, 100 Daxue Dong Rd, Nanning 530004, Peoples R China

来源：

SUSTAINABLE ENERGY & FUELS | 2022年 / 6卷 / 02期

基金：

中国国家自然科学基金;

关键词：

ELECTROCATALYSIS;

D O I：

10.1039/d1se01424b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carbon materials are widely used as cathode host materials for lithium-sulfur batteries due to their high specific surface area and high conductivity. Rational structural design can improve the sulfur storage capacity of carbon materials, and appropriate heteroatom doping can enhance the adsorption capacity for lithium polysulfides, thus improving the cycling stability of lithium-sulfur batteries. Herein, we synthesized nitrogen doped porous carbon spheres (NHCSs) with high nitrogen content as cathode host materials for lithium-sulfur batteries, and prepared porous carbon spheres with different nitrogen contents by heat treatment. In comparison, the porous carbon spheres with the highest nitrogen content possess the best polysulfide adsorption capacity and electrochemical activity, leading to a high initial capacity of 806.54 mA h g(-1) at 2C and excellent capacity retention rate of 85.71% after 500 cycles. The high electrochemical reversibility and reaction mechanism of carbon spheres with high nitrogen content were confirmed by in situ Raman and in situ XRD. Moreover, NHCS-1/S still exhibits a high areal capacity of 4.11 mA h cm(-2) even with a sulfur loading of 4 mg cm(-2). This study provides a new strategy and direction for the design of carbon materials as cathode host materials for lithium-sulfur batteries.

引用

页码：320 / 328

页数：9