Synthesis of full concentration gradient, cathode studied by high energy X-ray diffraction

Title
Synthesis of full concentration gradient, cathode studied by high energy X-ray diffraction
Author
선양국
Keywords
In situ XRD; Full concentration gradient cathode; Lithium ion battery
Issue Date
2016-01
Publisher
ELSEVIER SCIENCE BV
Citation
NANO ENERGY, v. 19, Page. 522-531
Abstract
Nickel-rich metal oxides have been widely pursued as promising cathode materials for high energy density lithium-ion batteries. Nickel-rich lithium transition metal oxides can deliver a high specific capacity during cycling, but can react with non-aqueous electrolytes. In this work, we have employed a full concentration gradient (FCG) design to provide a nickel-rich core to deliver high capacity and a manganese-rich outer layer to provide enhanced stability and cycle life. In situ high-energy X-ray diffraction was utilized to study the structural evolution of oxides during the solid-state synthesis of FCG lithium transition metal oxide with a nominal composition of LiNi0.6Mn0.2Co0.2O2. We found that both the pre-heating step and the sintering temperature were critical in controlling phase separation of the transition metal oxides and minimizing the content of Li2CO3 and NiO, both of which deteriorate the electrochemical performance of the final material. The insights revealed in this work can also be utilized for the design of other nickel-rich high energy-density cathode materials. (C) 2016 Elsevier Ltd. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S2211285515003122?via%3Dihubhttp://hdl.handle.net/20.500.11754/31444
ISSN
2211-2855; 2211-3282
DOI
10.1016/j.nanoen.2015.07.019
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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