[논문]Nitrogen-rich hierarchical porous carbon paper for a free-standing cathode of lithium sulfur battery

Park, Jae Hyun; Choi, Won Yeong; Yang, Jeongwoo; Kim, Dohyeun; Gim, Hyeonseo; Lee, Jae W.

doi:10.1016/j.carbon.2020.10.078

[해외논문] Nitrogen-rich hierarchical porous carbon paper for a free-standing cathode of lithium sulfur battery

Carbon, v.172, 2021년, pp.624 - 636

Park, Jae Hyun (Corresponding author.) , Choi, Won Yeong , Yang, Jeongwoo , Kim, Dohyeun , Gim, Hyeonseo , Lee, Jae W.

Abstract ▼ AI-Helper

Abstract A free-standing cathode without any binder, conductor, and current collector is attractive due to its reduced weight and cost. This study introduces nitrogen-rich and hierarchical porous carbon fibers in the form of a free-standing carbon paper synthesized by NaBH4-aided electrospinning and subsequent CO2 annealing. This modified process leads to a large mesopore volume of 1.007 cm3 g−1 and exposes the nitrogen inside the polymer to the surface of the fiber, resulting in the outstanding surface nitrogen content of 19.38 wt% with abundant pyridinic-N and pyrrolic-N of 16.24 wt% in total surface atoms, while eliminating any further treatment for increasing porosity or coating the polar active sites. The resultant material impregnated by sulfur and filtered by a graphene solution is directly employed as a cathode without any additives. As a result, the capacity is maintained at 696 mAh g−1 up to the 500th cycle at 0.2 C, and 645 mAh g−1 at a high current density of 5.0 C. Even with a high sulfur loading of 6.11 mg cm−2, a remarkable areal capacity of 3.09 mAh cm−2 is recorded after 500 cycles at 0.2 C with the free-standing form preserved. Highlights NaBH4-added electrospinning and subsequent heat treatment under CO2 atmosphere. High meso pore volume of 1.007 cm3 g−1, and surface nitrogen contents of 19.38 wt%. Employed as a cathode without any additives due to a free-standing paper form. High sulfur amount of 6.11 mg cm−2, and capacity of 3.09 mAh cm−2 for 500 cycles. Graphical abstract [DISPLAY OMISSION]

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