期刊
JOURNAL OF POWER SOURCES
卷 177, 期 2, 页码 528-536出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2007.11.076
关键词
mixed active material cathodes; Li battery; LiFePO4; LiNiMnO2; LiCoO2; hybrid
The efficacy of composite Li-ion battery cathodes made by mixing active materials that possessed either high-rate capability or high specific energy was examined. The cathode structures studied contained carbon-coated LiFePO4 and either Li[Li0.17Mn0.58Ni0.25]O-2 or LiCoO2. These active materials were arranged using three different electrode geometries: fully intermixed, fully separated, or layered. Discharge rate studies, cycle-life evaluation, and electrochemical impedance spectroscopy studies were conducted using coin cell test structures containing Li-metal anodes. Results indicated that electrode configuration was correlated to rate capability and degree of polarization if there was a large differential between the rate capabilities of the two active material species. (C) 2007 Elsevier B.V. All rights reserved.
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