Coffee grounds derived sulfur and nitrogen dual‑doped porous carbon for the cathode material of lithium‑sulfur batteries

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon letters / 33권 / 4호
ㆍ저자명 : Yating Wen, Xiaobin Wang, Jingyi Huang, Yu Li, Tao Li, Baozeng Ren

목차

Coffee grounds derived sulfur and nitrogen dual-doped porous carbon for the cathode material of lithium-sulfur batteries
Abstract
1 Introduction
2 Experiment
2.1 Synthesis of carbon materials
2.2 Preparation of sulfur-carbon composites
2.3 Characterization
2.3.1 Physical characterization
2.3.2 Electrochemical characterization
3 Results and discussion
3.1 Physicochemical characterization of the HPC, SNHPC-n, HPCS, and SNHPC-nS
3.2 Electrochemical performance of the HPCS and SNHPC-nS
4 Conclusion
Acknowledgements
References

영어 초록

The development of functional carbon materials using waste biomass as raw materials is one of the research hotspots of lithium-sulfur batteries in recent years. In this work, used a natural high-quality carbon source—coffee grounds, which contain more than 58% carbon and less than 1% ash. Honeycomb-like S and N dual-doped graded porous carbon (SNHPC) was successfully prepared by hydrothermal carbonization and chemical activation, and the amount of thiourea used in the activation process was investigated. The prepared SNHPC showed excellent electrochemical energy storage characteristics. For example, SNHPC-2 has a large pore volume (1.85 cm3·g− 1), a high mesoporous ratio (36.76%), and a synergistic effect (S, N interaction). As the cathode material of lithium-sulfur batteries, SNHPC-2/S (sulfur content is 71.61%) has the highest specific capacity. Its initial discharge-specific capacity at 0.2 C is 1106.7 mAh·g−1, and its discharge-specific capacity after 200 cycles is still as high as 636.5 mAh·g−1.

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