Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 16, Pages 6974-6977Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2010.11.014
Keywords
AlF3 coating; Blend; Cathode; Battery; Lithium
Funding
- Korean Government (MEST) [NRF-2009-C1AAA001-0093307, 2009-0092780]
- National Research Foundation of Korea [2009-0092780, 2009-0093467] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Surface modifications of electrode materials can improve the electrochemical and thermal properties of cathodes for use in lithium batteries. In this study, AlF3-coated LiCoO2 and AlF3-coated Li[Ni1/3Co1/3Mn1/3]O-2 cathode materials are blended, as both have the same crystal structure and exhibit similar electrochemical properties. The composite electrodes exhibit high discharge capacities of 180-188 mAhg(-1) in a voltage range of 3.0-4.5 V at room temperature. The capacity retention of the composite electrode is greater than 95% of the initial capacity after 50 cycles. The thermal stability of these composite electrodes is greatly improved because of the superior thermal stability of AlF3-coated Li[Ni1/3Co1/3Mn1/3]O-2. The blended AlF3-coated LiCoO2 and AlF3-coated Li[Ni1/3Co1/3Mn1/3]O-2 electrode shows two exothermic peaks, one at 227 degrees C from AlF3-coated LiCoO2 and another at 277 degrees C from AlF3-coated Li[Ni1/3Co1/3Mn1/3]O-2. accompanied by significantly reduced exothermic heat generation. (C) 2010 Elsevier B.V. All rights reserved.
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