TY - JOUR
T1 - Self-supported hierarchically porous 3D carbon nanofiber network comprising Ni/Co/NiCo2O4 nanocrystals and hollow N-doped C nanocages as sulfur host for highly reversible Li–S batteries
AU - Saroha, Rakesh
AU - Seon, Young Hoe
AU - Jin, Bo
AU - Kang, Yun Chan
AU - Kang, Dong Won
AU - Jeong, Sang Mun
AU - Cho, Jung Sang
N1 - Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF-2021R1A4A2001687, and NRF-2021R1I1A3057700) and Chungbuk National University BK21 program (2021).
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10/15
Y1 - 2022/10/15
N2 - Hierarchically porous nitrogen-doped carbon nanofibers (P-N-CNF) comprise well-embedded metallic-Ni/Co and spinel-type NiCo2O4 nanocrystals (Ni-Co/NiCo2O4) along with metal-organic framework-derived hollow nitrogen-doped carbon nanocages (HNC), denoted as P-N-CNF@NCO/HNC, are rationally designed as cathode substrates for advanced lithium-sulfur batteries with feasible parameters. The highly conductive and porous N-CNF matrix provides numerous conductive channels for rapid ionic and electronic transfer. HNC guarantees efficient impregnation of a large volume of active material along with high loading, channelizing the volume variation stress, and ensuring efficient electrolyte percolation, which is crucial for uniform dispersion and high active sulfur utilization, especially at low electrolyte/sulfur (E/S) ratios. The metallic-Ni/Co and polar spinel-type NiCo2O4 nanoparticles offer sufficient chemisorption sites to prevent polysulfide migration towards the anode. Li-S cells assembled using P-N-CNF@NCO/HNC as an advanced host and lithium polysulfide catholyte as the starting material displayed stable electrochemical performance even with strident battery parameters, including high sulfur content (79.8 wt%), high sulfur loading (7.7 mg cm−2), and low E/S ratio (8.0 µL mg−1). The cell displays a maximum areal capacity of 5.4 mA h cm−2 that stabilizes to 2.8 mA h cm−2 after 160 cycles at 0.1 C and is comparable to the theoretical threshold of presently available commercial systems.
AB - Hierarchically porous nitrogen-doped carbon nanofibers (P-N-CNF) comprise well-embedded metallic-Ni/Co and spinel-type NiCo2O4 nanocrystals (Ni-Co/NiCo2O4) along with metal-organic framework-derived hollow nitrogen-doped carbon nanocages (HNC), denoted as P-N-CNF@NCO/HNC, are rationally designed as cathode substrates for advanced lithium-sulfur batteries with feasible parameters. The highly conductive and porous N-CNF matrix provides numerous conductive channels for rapid ionic and electronic transfer. HNC guarantees efficient impregnation of a large volume of active material along with high loading, channelizing the volume variation stress, and ensuring efficient electrolyte percolation, which is crucial for uniform dispersion and high active sulfur utilization, especially at low electrolyte/sulfur (E/S) ratios. The metallic-Ni/Co and polar spinel-type NiCo2O4 nanoparticles offer sufficient chemisorption sites to prevent polysulfide migration towards the anode. Li-S cells assembled using P-N-CNF@NCO/HNC as an advanced host and lithium polysulfide catholyte as the starting material displayed stable electrochemical performance even with strident battery parameters, including high sulfur content (79.8 wt%), high sulfur loading (7.7 mg cm−2), and low E/S ratio (8.0 µL mg−1). The cell displays a maximum areal capacity of 5.4 mA h cm−2 that stabilizes to 2.8 mA h cm−2 after 160 cycles at 0.1 C and is comparable to the theoretical threshold of presently available commercial systems.
KW - Catholytes
KW - Metal-organic frameworks
KW - Nitrogen-doped carbon matrices
KW - Porous sulfur hosts
KW - Viable lithium-sulfur batteries
UR - http://www.scopus.com/inward/record.url?scp=85131102731&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2022.137141
DO - 10.1016/j.cej.2022.137141
M3 - Article
AN - SCOPUS:85131102731
SN - 1385-8947
VL - 446
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 137141
ER -