期刊
JOURNAL OF POWER SOURCES
卷 259, 期 -, 页码 233-244出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.02.077
关键词
Layered-layered oxides; Electrode formulation; Electrode fabrication; Pouch cell testing; LMR-NMC
资金
- U.S. Department of Energy's Vehicle Technologies-Applied Battery Research (ABR)
- U.S. Department of Energy Office of Science laboratory [DE-ACO2-06CH11357]
In this article we describe efforts to improve performance and cycle life of cells containing Li1.2Ni0.15Mn0.55Co0.1O2-based positive and graphite-based negative electrodes. Initial work to identify high-performing materials, compositions, fabrication variables, and cycling conditions is conducted in coin cells. The resulting information is then used for the preparation of double-sided electrodes, assembly of pouch cells, and electrochemical testing. We report the cycling performance of cells with electrodes prepared under various conditions. Our data indicate that cells with positive electrodes containing 92 wt.% Li1.2Ni0.15Mn0.55Co0.1O2, 4 wt.% carbons (no graphite), and 4 wt.% PVdF (92-4-4) show similar to 20% capacity fade after 1000 cycles in the 2.5-4.4 V range, significantly better than our baseline cells that show the same fade after only 450 cycles. Our analyses indicate that the major contributors to cell energy fade are capacity loss and impedance rise. Therefore incorporating approaches that minimize capacity fade and impedance rise, such as electrode coatings and electrolyte additives, can significantly enhance calendar and cycle life of this promising cell chemistry. (C) 2014 Elsevier B.V. All rights reserved.
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