S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
PIM-1-based carbon-sulfur composites for sodium-sulfur batteries that operate without the shuttle effect
- Jeon, Jun Woo; Kim, Dong-Min; Lee, Jinyoung; Lee, Jong-Chan; Kim, Yong Seok; Lee, Kyu Tae; Kim, Byoung Gak
- Issue Date
- Journal of Materials Chemistry A, Vol.8 No.7, pp.3580-3585
- 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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