Morphology effects on the electrochemical performance of LiNi{sub 1{minus}x}Co{sub x}O{sub 2}
Journal Article
·
· Journal of the Electrochemical Society
- Westaim Corp., Fort Saskatchewan, Alberta (Canada)
LiNi{sub 1{minus}x}Co{sub x}O{sub 2} is being considered for use as a cathode material in commercial lithium-ion batteries because of its higher capacity and lower material cost than its end member LiCoO{sub 2}. On the other hand, LiNi{sub 1{minus}x}Co{sub x}O{sub 2} has better thermal stability than its other end member LiNiO{sub 2}. In this paper the authors examine the influence of particle size and particle morphology on the electrochemical behavior of LiNi{sub 1{minus}x}Co{sub x}O{sub 2} and the dependence of the irreversible capacity on Co content, temperature, and particle size. Coin cell performance at room temperature and at 40 C indicates that LiNi{sub 1{minus}x}Co{sub x}O{sub 2} with a large crystal particle size (P{sub c}) has a low capacity fade rate. The irreversible capacity is reduced at high temperature. By optimizing particle size and cobalt content in LiNi{sub 1{minus}x}Co{sub x}O{sub 2}, it is possible to achieve cycle performance comparable with LiCoO{sub 2} at room temperature and at 40 C, and have a reversible capacity (between 150 and 200 mAh/g) substantially higher than LiCoO{sub 2} (140 mAh/g). LiNi{sub 1{minus}x}Co{sub x}O{sub 2} (0.1 < x < 0.3) tested at C/1 discharge and at 40 C also shows a low capacity fade rate comparable to that of LiCoO{sub 2} material.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 536472
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 8 Vol. 144; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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