Optimization of Layered Cathode Material with Full Concentration Gradient for Lithium-Ion Batteries

Title
Optimization of Layered Cathode Material with Full Concentration Gradient for Lithium-Ion Batteries
Author
선양국
Keywords
ELECTROCHEMICAL PROPERTIES; HIGH-ENERGY; ELECTRODE MATERIALS; MN CONTENT; COPRECIPITATION; CHALLENGES
Issue Date
2014-01
Publisher
AMERICAN CHEMICAL SOCIETY
Citation
Journal of Physical Chemistry C, 2014, 118(1), P.175-182
Abstract
Li[NixCoyMn1?x?y]O2 cathode materials were synthesized with varying concentration gradients of Ni and Co ions from the particle center (0.62?0.74 mol % for Ni and 0.05 mol % for Co) to the surface (0.48?0.62 mol % for Ni and 0.18 mol % for Co), i.e., full concentration gradient (FCG) with fixed Mn concentrations. In particular, the Mn concentration (20, 25, and 33 mol %) was controlled to optimize electrode performance. The average chemical compositions of lithiated products were Li[NixCo0.16Mn0.84?x]O2 (x = 0.64, 0.59, 0.51). These cathode materials with concentration gradients followed the general performance trend of conventional layered materials; an increase in Ni content improved the capacity, whereas a higher amount of Mn delivered better capacity retention and thermal properties at the expense of capacity. As a result, we determined an optimal level of Mn concentration among the tested FCG cathodes, which maximized the discharge capacity of 188 mAh g?1 and had an excellent capacity retention of 96% over 100 cycles operated up to 4.3 V at 25 °C, with a composition of FCG Li[Ni0.59Co0.16Mn0.25]O2.
URI
http://pubs.acs.org/doi/10.1021/jp4097887http://hdl.handle.net/20.500.11754/47687
ISSN
1932-7447; 1932-7455
DOI
10.1021/jp4097887
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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