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Jeong, Hu Young
UNIST Central Research Facilities (UCRF)
Research Interests
  • Soft material characterization such as graphene using a low kV Cs-corrected TEM
  • Insitu-TEM characterization of carbon-based materials using nanofactory STM holder for Li-ion battery application
  • Structural characterization of mesoporous materials using SEM & TEM
  • Interface analysis between various oxides and metals through Cs-corrected (S)TEM
  • Resistive switching mechanism of graphene oxide thin films for RRAM application

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Electrochemical scissoring of disordered silicon-carbon composites for high-performance lithium storage

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Title
Electrochemical scissoring of disordered silicon-carbon composites for high-performance lithium storage
Author
Ryu, JaegeonBok, TaesooJoo, Se HunYoo, SeokkeunSong, GyujinKim, Su HwanChoi, SunghoJeong, Hu YoungKim, Min GyuKang, Seok JuWang, ChongminKwak, Sang KyuPark, Soojin
Issue Date
2021-04
Publisher
Elsevier BV
Citation
ENERGY STORAGE MATERIALS, v.36, pp.139 - 146
Abstract
Practically adapted physical integration of silicon and carbon predominates as a viable solution to realize high energy density batteries, however, the composite structure is vulnerable to fracture. Here we report a molecular-level mixed silicon-carbon composite anode through thermal pyrolysis of silane and subsequent mechanical mill, entailed by electrochemical dissociation and reclustering of such disordered silicon-carbon bonds during the cycles. Lithium insertion induces heterolytic fission of the bonds into sub-nanometre silicon particles segregated by redox-active carbon framework validated by microscopy analysis and reactive molecular dynamics simulation. The embedded structure with a high packing density of silicon prevents detrimental electrochemical coalescence and direct contact to a liquid electrolyte to stabilize the interfaces, while three-dimensional (3D) carbon framework buffers large volume expansion of silicon to enable an extended full battery cycling.
URI
https://scholarworks.unist.ac.kr/handle/201301/49845
URL
https://www.sciencedirect.com/science/article/pii/S2405829720304864
DOI
10.1016/j.ensm.2020.12.023
ISSN
2405-8297
Appears in Collections:
UCRF_Journal Papers
ECHE_Journal Papers
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