Publications by authors named "Hyung-Seok Lim"

5 Publications

  • Page 1 of 1

Lithium Dendrite Suppression with a Silica Nanoparticle-Dispersed Colloidal Electrolyte.

ACS Appl Mater Interfaces 2020 Aug 7;12(33):37188-37196. Epub 2020 Aug 7.

Department of Chemical & Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.

Developing a safe and long-lasting lithium (Li) metal battery is crucial for high-energy applications. However, its poor cycling stability due to Li dendrite formation and excessive Li pulverization is the major hurdle for its practical applications. Here, we present a silica (SiO) nanoparticle-dispersed colloidal electrolyte (NDCE) and its design principle for suppressing Li dendrite formation. SiO nanoclusters in the NDCE play roles in enhancing the Li transference number and increasing the Li diffusivity in the vicinity of the Li-plating substrate. The NDCE enables less-dendritic Li plating by manipulating the nucleation-growth mode and extending Sand's time. Moreover, SiO can interplay with the electrolyte components at the Li-metal surface, enriching fluorinated compounds in the solid electrolyte interface layer. The initial control of the Li plating morphology and SEI structure by the NDCE leads to a more uniform and denser Li deposition upon subsequent cycling, resulting in threefold enhancement of the cycle life. The efficacy of the NDCEs has been further demonstrated by the practical battery design, featuring a commercial-level cathode and thin Li-metal (40 μm) anode.
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http://dx.doi.org/10.1021/acsami.0c09871DOI Listing
August 2020

Correction: Highly lithium-ion conductive battery separators from thermally rearranged polybenzoxazole.

Chem Commun (Camb) 2015 Feb;51(16):3474

School of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Korea.

Correction for 'Highly lithium-ion conductive battery separators from thermally rearranged polybenzoxazole' by Moon Joo Lee et al., Chem. Commun., 2015, 51, 2068-2071.
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http://dx.doi.org/10.1039/c5cc90064fDOI Listing
February 2015

Highly lithium-ion conductive battery separators from thermally rearranged polybenzoxazole.

Chem Commun (Camb) 2015 Feb;51(11):2068-71

School of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Korea.

High power density lithium ion battery (HLIB) separators were fabricated for the first time from thermally rearranged poly(benzoxazole-co-imide) (TR-PBOI) nanofibrous membranes coated with TR-PBOI nanoparticles, which show distinct thermal and dimensional stabilities as well as excellent cycle retention and rate capability.
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http://dx.doi.org/10.1039/c4cc09411eDOI Listing
February 2015

One-pot template-free synthesis of monodisperse hollow hydrogel microspheres and their resulting properties.

Macromol Rapid Commun 2013 Aug 9;34(15):1243-8. Epub 2013 Jul 9.

Department of Chemical Engineering, College of Engineering, Hanyang University, Seoul, 133-791, Republic of Korea.

Monodisperse poly(methacrylic acid/ethyleneglycoldimethacrylate) (MAA/EGDMA) hollow microcapsules, which exhibit pH-responsive behavior, are prepared by diffusion of cationic surfactants and hydrophobic interaction. During the association of the negatively charged hydrogel microspheres and an oppositely charged surfactant (cetyltrimethylammonium bromide, CTA(+)B), the hydrophobic polymer-surfactant complexes that form are separated from the internal water; consequently, a hollow structure can be formed. Confocal laser scanning microscopy, UV spectro-scopy and zeta potential are employed to study the formation of the hollow structure during the diffusion of the cationic surfactant. The controlled release behavior of methylene blue as a model drug from the as-prepared poly(MAA/EGDMA) microcapsules with a hollow structure is investigated under different pH conditions. The hollow structure can be retained, even during repetitive pH changes.
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http://dx.doi.org/10.1002/marc.201300330DOI Listing
August 2013

Monodisperse conducting colloidal dipoles with symmetric dimer structure for enhancing electrorheology properties.

J Colloid Interface Sci 2012 May 4;374(1):18-24. Epub 2012 Feb 4.

Division of Chemical Engineering, College of Engineering, Hanyang University, Seoul 133-791, Republic of Korea.

This study introduces an electrorheological (ER) approach that allows us to obtain remarkably enhanced ER properties by using monodisperse colloidal dimer particles. Two sets of colloidal particles, which are spheres and symmetric dimers, were synthesized employing the seeded polymerization technique. The aspect ratio of dimer particles was ~1.43. Then, the surface of the particles was coated with polyaniline by using the chemically oxidative polymerization method. After preparation of the particle suspensions having the same particle volume and concentration, their ER behavior was investigated with changing the electric field strength. At the same experimental condition, both shear stress and shear yield stress of the dimer particle suspension remarkably increased, compared with those of the spherical particle suspension. This attributes to the fact that the shape anisotropy of suspending particles effectively led to increase in the dipole moment under the electric field, thus resulting in formation of a well-structured colloidal chains between the electrodes.
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http://dx.doi.org/10.1016/j.jcis.2012.01.055DOI Listing
May 2012