期刊
JOURNAL OF POWER SOURCES
卷 195, 期 13, 页码 4313-4317出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.01.016
关键词
Lithium metal oxide; Sol-gel; Co-precipitation; High-rate; Lithium batteries
资金
- U.S-DOD-ARO-Electrochemistry and Advanced Energy Conversion Division [W911NF-08-C-0415]
High rate performance of Li1.05Ni1/3Co1/3Mn1/3O2 cathode materials prepared using sol-gel (SG) and coprecipitation (CP) methods were investigated. Scanning electron microscopy results showed that the particle sizes of the materials prepared by SG and CP methods were 300-400 nm and 1-2 mu m, respectively. Rate capability tests were performed and compared on these cathode materials with same electrode loading (7 mg cm(-2)). Li1.05Ni1/3Co1/3Mn1/3O2 cathode with smaller particle size (SG-nano) demonstrated higher discharge capacity than that of the cathode with larger particle size (CP-micro) at different C-rates. However, upon extended cycling at 1C and 8C, CP-micro showed better capacity retention when compared to that of SG-nano. CP-micro exhibited 95 and 91% where as SG-nano exhibited only 87 and 76%, respectively. at 1C and 8C after 50 cycles. The results showed that the use of nanosized materials was advantageous for obtaining a better rate capability where as the use of microsized materials was beneficial for better capacity retention during extended cycling at high C-rates. (C) 2010 Elsevier B.V. All rights reserved.
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