Synthesis of Li[(Ni0.5Mn0.5)(1-x)Li-x]O-2 by emulsion drying method and impact of excess Li on structural and electrochemical properties
- Authors
- Myung, Seung-Taek; Komaba, Shinichi; Kurihara, Koutarou; Hosoya, Kiyoharu; Kumagai, Naoaki; Sun, Yang-Kook; Nakai, Izumi; Yonemura, Masao; Kamiyama, Takashi
- Issue Date
- Mar-2006
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.18, no.6, pp.1658 - 1666
- Indexed
- SCIE
SCOPUS
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 18
- Number
- 6
- Start Page
- 1658
- End Page
- 1666
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/181694
- DOI
- 10.1021/cm052704j
- ISSN
- 0897-4756
- Abstract
- Layered Li[Ni0.5Mn0.5]O-2 (R (3) over barm space group) was synthesized with controlling the Li/(Ni + Mn) ratio by employing an emulsion drying method, and the effect of Li on the transition-metal layer was investigated. Structural analyses of the final products were done by X-ray diffraction, neutron diffraction, and X-ray absorption near-edge spectroscopy. From the structural studies, we found that an excess amount of Li is located at the transition-metal layer and the presence of Li in the transition metal significantly improved structural ordering in the crystal structure. High capacity with good cyclability, faster Li+ chemical diffusivity, less changes in the host structure by Li+ de-/intercalation, and higher thermal stability were achieved for the Li-excess Li[(Ni0.5Mn0.5)(0.94)Li-0.06]O-2 compound relative to Li[Ni0.5Mn0.5]O-2. It is believed that such enhanced electrochemical properties are related to the improved physical and structural proper-ties of Li-excess Li[(Ni0.5Mn0.5)(0.94)Li-0.06]O-2.
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