Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 13, Issue 11, Pages 1213-1216Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.08.041
Keywords
Lithium-ion batteries; High-voltage cathodes; Spinel cathodes; Surface segregation; Electrochemical performance
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Funding
- US Army Research Laboratory [W911QX-07-D-0002]
- Office of Vehicle Technologies of the U.S. Department of Energy [DE-AC02-05CH11231]
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The substitution of a small amount of Ga in the high-voltage spinel cathode LiMn1.5Ni0.42Ga0.08O4 leads to superior cyclability at room temperature and 55 degrees C along with higher rate capability with conventional electrolytes compared to that found with the LiMn1.5Ni0.5O4 cathode. The superior performance is attributed to the segregation of the inert Ga3+ ions to the surface during the synthesis process, providing a robust, more stable interface with the electrolyte at the high operating voltage (similar to 4.7 V), along with the stabilization of the spinel structure with a disordering of the cations in the octahedral sites. (C) 2011 Elsevier B.V. All rights reserved.
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