Mechanochemical synthesis of Li₂MnO₃ shell/LiMO₂ (M = Ni, Co, Mn) core-structured nanocomposites for lithium-ion batteries.
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.
1] 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].
Jae-Kyo
JK
Noh
1] 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].
Soo
S
Kim
Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea.
Haesik
H
Kim
Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea.
Wonchang
W
Choi
Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea.
Wonyoung
W
Chang
Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Seongbuk-gu, Seoul 136-701, Republic of Korea.
Dongjin
D
Byun
Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea.
Byung-Won
BW
Cho
Center for Energy Convergence, Korea Institute of Science and Technology (KIST), Hwarangno 14-gil-5, Seongbuk-gu, Seoul 136-197, Republic of Korea.
Kyung Yoon
KY
Chung