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Performance of high‐power lithium‐ion cells under pulse discharge and charge conditions
Author(s) -
Abraham D. P.,
Dees D. W.,
Christophersen J.,
Ho C.,
Jansen A. N.
Publication year - 2010
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.1665
Subject(s) - anode , electrode , electrolyte , materials science , lithium (medication) , cathode , self discharge , current (fluid) , electrical impedance , pulsed power , analytical chemistry (journal) , voltage , chemistry , electrical engineering , optoelectronics , engineering , medicine , endocrinology , chromatography
Lithium‐ion cells being designed for transportation applications must sustain high current pulses under rapid discharge and rapid charge conditions without significant degradation of cell performance. In this article we examine the pulse discharge and charge performance of cells, containing a LiNi 0.8 Co 0.15 Al 0.05 O 2 ‐based cathode, a graphite‐based anode, and a LiPF 6 ‐bearing EC:EMC electrolyte, at current rates ranging from 3 to 25 C. Impedance data indicate that 18650‐type cells containing this chemistry can withstand 18 s discharge pulses at rates up to 17 C in the 3.7–4.0 V voltage window. Data from cells containing a LiSn micro‐reference electrode show that the positive electrode impedance increases, whereas the negative electrode impedance decreases, with increasing magnitude of the discharge current pulse. The discharge pulse‐current that can be sustained by the cell is limited by lithium diffusion into oxide particles of the positive electrode. Copyright © 2009 John Wiley & Sons, Ltd.