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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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Superior Long-Term Energy Retention and Volumetric Energy Density for Li-Rich Cathode Materials

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Title
Superior Long-Term Energy Retention and Volumetric Energy Density for Li-Rich Cathode Materials
Author
Oh, PilgunMyeong, SeungjunCho, WoongraeLee, Min-JoonKo, MinseongJeong, Hu YoungCho, Jaephil
Issue Date
2014-10
Publisher
AMER CHEMICAL SOC
Citation
NANO LETTERS, v.14, no.10, pp.5965 - 5972
Abstract
Li-rich materials are considered the most promising for Li-ion battery cathodes, as high energy densities can be achieved. However, because an activation method is lacking for large particles, small particles must be used with large surface areas, a critical drawback that leads to poor long-term energy retention and low volumetric energy densities. Here we propose a new material engineering concept to overcome these difficulties. Our material is designed with 10 mu m-sized secondary particles composed of submicron scaled flake-shaped primary particles that decrease the surface area without sacrificing rate capability. A novel activation method then overcomes the previous limits of Li-rich materials with large particles. As a result, we attained high average voltage and capacity retention in turn yielding excellent energy retention of 93% during 600 cycles. This novel and unique approach may furthermore open the door to new material engineering methods for high-performance cathode materials.
URI
https://scholarworks.unist.ac.kr/handle/201301/8893
DOI
10.1021/nl502980k
ISSN
1530-6984
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