Journal
RARE METALS
Volume 41, Issue 10, Pages 3432-3445Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-022-02022-0
Keywords
Hierarchically porous carbon; Nitrogen-doped carbon; Li-Se batteries; Electrochemical performances
Funding
- National Natural Science Foundation of China [52002037, 51772090]
- Scientific Research Fund of Hunan Provincial Education Department [21B0758]
- Natural Science Foundation of Hunan Province [2020JJ4272]
- Education Department of Hunan Province [19C0576]
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In this study, a hierarchically porous nitrogen-doped carbon material was developed as a scaffold for selenium in lithium-selenium batteries, leading to significant improvement in performance.
Hierarchically porous nitrogen-doped carbon (HPNC) with interconnected micro-, meso-, and macropores was generated from KOH and urea etching as a carbon scaffold to infuse Se. In this structure, micropores confine Se as single-chain molecules, preventing the generation of higher-order polyselenides, the mesopores provide effective pathways for electrolyte diffusion and ion transport and offer sufficient void space to accommodate the volume change of Se upon lithiation/delithiation, and the doped nitrogen improves the electrical conductivity of HPNC and increases the utilization of Se. When applied as a scaffold for Se in a lithium-selenium battery, the Se/HPNC cathode with a large Se content of 67.6 wt% maintains a high discharge capacity of 410 mAh.g(-1) at the 500th cycle at 1.0C, and it demonstrates a discharge capacity as high as 371 mAh.g(-1) even at a high current density of 5.0C. Moreover, when the current density returns to 0.2C, the discharge capacity recovers to 527 mAh.g(-1) with a capacity retention rate of 90.5% for the first 0.2C, indicating the excellent structural stability of HPNC. HPNC has significant potential for application in energy storage systems.
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