Mechanochemical synthesis of Li2MnO3 Shell/LiMO 2 (M = Ni, Co, Mn) core-structured nanocomposites for lithium-ion batteries

Jae Kyo Noh, Soo Kim, Haesik Kim, Wonchang Choi, Wonyoung Chang, Dongjin Byun, Byung Won Cho, Kyung Yoon Chung

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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 Li 2MnO3 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 xLi 2MnO3·(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.

Original languageEnglish
Article number4847
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014 May 2

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