期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 28, 页码 23782-23791出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b05798
关键词
microalgaes; porous carbon microspheres; nitrogen doping; biotemplating method; lithium-sulfur batteries
资金
- National Natural Science Foundation of China [21403196, 51572240, 51677170]
- Natural Science Foundation of Zhejiang Province [LY17E020010, LQ14E020005, LY16E070004]
- Science & Technology Department of Zhejiang Province [2016C31012, 2016C33009]
Lithium-sulfur (Li-S) battery is one of the most attractive candidates for the next-generation energy storage system. However, the intrinsic insulating nature of sulfur and the notorious polysulfide shuttle are the major obstacles, which hinder the commercial application of Li-S battery. Confining sulfur into conductive porous carbon matrices with designed polarized surfaces is regarded as a promising and effective strategy to overcome above issues. Herein, we propose to use microalgaes (Schizochytrium sp.) as low-cost, renewable carbon/nitrogen precursors and biological templates to synthesize N doped porous carbon microspheres (NPCMs). These rational designed NPCMs can not only render the sulfur-loaded NPCMs (NPCSMs) composites with high electronic conductivity and sulfur content, but also greatly suppress the diffusion of polysulfides by strongly physical and chemical adsorptions. As a result, NPCSMs cathode demonstrates a superior reversible capacity (1030.7 mA h g(-1)) and remarkable capacity retention (91%) at 0.1 A g(-1) after 100 cycles. Even at an extremely high current density of 5 A g(-1), NPCSMs still can deliver a satisfactory discharge capacity of 692.3 mAh g(-1). This work reveals a sustainable and effective biosynthetic strategy to fabricate N-doped porous carbon matrices for high performance sulfur cathode in Li-S battery, as well as offers a fascinating possibility to rationally design and synthesize novel carbon-based composites.
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