Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 2, Pages 567-573Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2009.07.052
Keywords
Li-ion battery; Cathode material; Li[Ni0.17Li0.2Co0.07Mn0.56]O-2; Pre-cycling treatment; Cyclic deterioration; TEM
Funding
- Japanese New Energy and Industrial Technology Development Organization (NEDO)
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Transmission electron microscopy (TEM) studies were carried out to elucidate cyclic deterioration phenomena for Li-rich layered cathode material Li[Ni0.17Li0.2Co0.07Mn0.56]O-2. The results obtained show that the deterioration starts during the initial charge/discharge to higher potential over 4.5 V, and leads to the formation of micro-cracks at the crystal surface and the distortion of crystal periodicity. These two kinds of defects lead to further non-crystallization of the crystal surface and the emergence of a very small amount of another possible phase. Our stepwise pre-cycling treatment effectively depressed the formation of the former two kinds of defects, and could significantly improve cyclic durability. The observation of non-crystallization at the cathode crystal surface, which would diminish the battery performance, is consistent with our preliminary ac impedance results. (C) 2009 Elsevier B. V. All rights reserved.
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