Effect of Mn Content in Surface on the Electrochemical Properties of Core-Shell Structured Cathode Materials

Title
Effect of Mn Content in Surface on the Electrochemical Properties of Core-Shell Structured Cathode Materials
Author
선양국
Keywords
LITHIUM-ION BATTERIES; POSITIVE ELECTRODE MATERIALS; HIGH-ENERGY; PERFORMANCE; COPRECIPITATION; SPECTROSCOPY; TEMPERATURE; PARTICLES; CELLS
Issue Date
2012-07
Publisher
ELECTROCHEMICAL SOC INC, 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA
Citation
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 권: 159, 호: 1, 페이지: A1-A5
Abstract
Two novel core-shell cathode materials with average compositions of Li[Ni(0.82)Co(0.04)Mn(0.14)]O(2) and Li[Ni(0.81)Co(0.06)Mn(0.13)]O(2) were synthesized via coprecipitation. Each core-shell material had a common Li[Ni(0.9)Co(0.05)Mn(0.05)]O(2) core which was completely encapsulated by two different concentration-gradient shells with stable surface compositions of Li[Ni(0.67)Co(0.01)Mn(0.32)]O(2) and Li[Ni0.62Co0.14Mn0.24]O(2). Electrochemical and thermal properties of the two materials were investigated and compared to those of the core Li[Ni(0.9)Co(0.05)Mn(0.05)]O(2) material. The Li[Ni(0.82)Co(0.04)Mn(0.14)]O(2) with a high concentration of Mn in the surface layer exhibited improved cycling performance and structural and thermal stability compared to Li[Ni(0.81)Co(0.06)Mn(0.13)]O(2) as well as the core material without the concentration gradient shell. Electrochemical impedance spectroscopy and electron microscopy showed that Mn concentration in surface layer played an important role in stabilizing the surface structure and thus suppressing the increase in the interfacial resistance between the cathode and the electrolyte. (C) 2011 The Electrochemical Society. [DOI: 10.1149/ 2.004201jes]
URI
http://jes.ecsdl.org/content/159/1/A1.shorthttp://hdl.handle.net/20.500.11754/43544
ISSN
0013-4651
DOI
10.1149/2.004201jes
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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