TY - JOUR
T1 - Separators Modified Using MoO2@Carbon Nanotube Nanocomposites as Dual-Mode Li-Polysulfide Anchoring Materials for High-Performance Anti-Self-Discharge Lithium-Sulfur Batteries
AU - Choi, Changhoon
AU - Lee, Dong Yeop
AU - Park, Jung Been
AU - Kim, Dong Wan
N1 - Funding Information:
This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the Ministry of Science and ICT (2019R1A2B5B02070203) and by the Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2018M3D1A1058744).
PY - 2020/10/12
Y1 - 2020/10/12
N2 - The commercialization of lithium-sulfur batteries (LSBs) remains difficult owing to the shuttle effect of soluble lithium-polysulfide and the poor redox kinetics of a traditional cell configuration without a sophisticated cathode design. To resolve these difficulties, we developed modified separators with electrically exploded MoO2@carbon nanotube (MoO2@CNT) nanocomposites. The embedded MoO2 nanoparticles demonstrated strong chemical anchoring properties with polysulfides; meanwhile, a porous CNT scaffold supported suppression of the shuttle effect and acted as an upper current collector. In addition, the mesoporous textural properties of a MoO2@CNT nanocomposite provide a suitable lithium-ion pathway with enhanced ionic conductivity and additional active sites for active sulfur during cycling; finally, a high utilization of sulfur is achieved in a reversible manner. The LSBs using the modified separator with the optimized MoO2@CNT nanocomposite exhibit high discharge capacities of 1067 mA h g-1 at 0.2 C after 100 cycles and significant cycling stability at 1 C. Also, an impressive anti-self-discharge feature and improved rate capabilities were achieved through the introduction of a MoO2@CNT nanocomposite. We believe that our approach can be used as a proof-of-concept for further research into effective methods to prepare modified separators with various electrically exploded carbon-metal oxide nanocomposites that can used in high-performance LSBs.
AB - The commercialization of lithium-sulfur batteries (LSBs) remains difficult owing to the shuttle effect of soluble lithium-polysulfide and the poor redox kinetics of a traditional cell configuration without a sophisticated cathode design. To resolve these difficulties, we developed modified separators with electrically exploded MoO2@carbon nanotube (MoO2@CNT) nanocomposites. The embedded MoO2 nanoparticles demonstrated strong chemical anchoring properties with polysulfides; meanwhile, a porous CNT scaffold supported suppression of the shuttle effect and acted as an upper current collector. In addition, the mesoporous textural properties of a MoO2@CNT nanocomposite provide a suitable lithium-ion pathway with enhanced ionic conductivity and additional active sites for active sulfur during cycling; finally, a high utilization of sulfur is achieved in a reversible manner. The LSBs using the modified separator with the optimized MoO2@CNT nanocomposite exhibit high discharge capacities of 1067 mA h g-1 at 0.2 C after 100 cycles and significant cycling stability at 1 C. Also, an impressive anti-self-discharge feature and improved rate capabilities were achieved through the introduction of a MoO2@CNT nanocomposite. We believe that our approach can be used as a proof-of-concept for further research into effective methods to prepare modified separators with various electrically exploded carbon-metal oxide nanocomposites that can used in high-performance LSBs.
KW - Cell configuration
KW - Lithium-sulfur batteries
KW - MoO-carbon nanotube composite
KW - Polysulfide shuttle effect
KW - Separator modification
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U2 - 10.1021/acssuschemeng.0c03835
DO - 10.1021/acssuschemeng.0c03835
M3 - Article
AN - SCOPUS:85094887758
VL - 8
SP - 15134
EP - 15148
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
SN - 2168-0485
IS - 40
ER -