Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 7, Pages 3580-3585Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta10939k
Keywords
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Funding
- Korea Research Institute of Chemical Technology (KRICT) [KK1607-C06, KK1961-02, SI1921-20]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2018R1A5A1024127]
- National Research Council of Science & Technology (NST), Republic of Korea [KK1961-02] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Room temperature sodium-sulfur (RT Na-S) batteries have distinct advantages over other next generation batteries because of their use of abundant and inexpensive resources with high theoretical capacities of 1166 and 1675 mA h g(-1), namely for sodium and sulfur. However, problematic side reactions, called the shuttle effect, lead to low coulombic efficiency during cycling. Here, we propose a new strategy to fundamentally suppress the shuttle phenomenon by combining two widely used concepts, covalent bonds and physical confinement, through the preparation of a PIM-1-based carbon-sulfur composite. This sulfur-carbon material was prepared through one-step heat treatment of a mixture of sulfur and PIM-1. The resulting sulfur-carbon composites have characteristics of both similar to 0.5 nm-sized ultra-micropores and covalent bonding in a single material, which fundamentally obstruct the dissolution of polysulfide into the electrolyte. This strategy led to long cycling stability over 250 cycles, with a capacity of 556 mA h g(s)(-1) and a coulombic efficiency of approximately 100%.
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