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Ion-Exchange Mechanism of Layered Transition-Metal Oxides: Case Study of LiNi0.5Mn0.5O2

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Title
Ion-Exchange Mechanism of Layered Transition-Metal Oxides: Case Study of LiNi0.5Mn0.5O2
Author(s)
Gwon, H; Kim, SW; Young-Uk Park; Jihyun Hong; Ceder, G; Jeon, S; Kisuk Kang
Publication Date
2014-08
Journal
INORGANIC CHEMISTRY, v.53, no.15, pp.8083 - 8087
Publisher
AMER CHEMICAL SOC
Abstract
An ion-exchange process can be an effective route to synthesize new quasi-equilibrium phases with a desired crystal structure. Important layered-type battery materials, such as LiMnO2 and LiNi0.5Mn0.5O2, can be obtained through this method from a sodium-containing parent structure, and they often show electrochemical properties remarkably distinct from those of their solid-state synthesized equivalents. However, while ion exchange is generally believed to occur via a simple topotactic reaction, the detailed phase transformation mechanism during the process is not yet fully understood. For the case of layered LiNi0.5Mn0.5O2, we show through ex situ X-ray diffraction (XRD) that the ion-exchange process consists of several sequential phase transformations. By a study of the intermediate phase, it is shown that the residual sodium ions in the final structure may greatly affect the electrochemical (de)lithiation mechanism.
URI
https://pr.ibs.re.kr/handle/8788114/935
ISSN
0020-1669
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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