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Sci Rep. 2014 May 2;4:4847. doi: 10.1038/srep04847.

Mechanochemical synthesis of Li₂MnO₃ shell/LiMO₂ (M = Ni, Co, Mn) core-structured nanocomposites for lithium-ion batteries.

Author information

  • 11] Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea [2] Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Seongbuk-gu, Seoul 136-701, Republic of Korea [3].
  • 21] Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea [2] [3].
  • 3Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea.
  • 4Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Seongbuk-gu, Seoul 136-701, Republic of Korea.

Abstract

Core/shell-like nanostructured xLi2MnO3·(1-x)LiMO2 (M = Ni, Co, Mn) composite cathode materials are successfully synthesized through a simple solid-state reaction using a mechanochemical ball-milling process. The LiMO2 core is designed to have a high-content of Ni, which increases the specific capacity. The detrimental surface effects arising from the high Ni-content are countered by the Li2MnO3 shell, which stabilizes the nanoparticles. The electrochemical performances and thermal stabilities of the synthesized nanocomposites are compared with those of bare LiMO2. In particular, the results of time-resolved X-ray diffraction (TR-XRD) analyses of xLi2MnO3·(1-x)LiMO2 nanocomposites as well as their differential scanning calorimetry (DSC) profiles demonstrate that the Li2MnO3 shell is effective in stabilizing the LiMO2 core at high temperatures, making the nanocomposites highly suitable from a safety viewpoint.

PMID:
24784478
[PubMed]
PMCID:
PMC4007074
Free PMC Article
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