期刊
JOURNAL OF POWER SOURCES
卷 281, 期 -, 页码 444-454出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.02.019
关键词
Lithium-rich layered oxide; Alumina coating; Sol-gel method; Sucrose; Cathode materials; Lithium ion batteries
资金
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry [[2011]1139]
- Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation [2013CL07]
- Changsha University of Science & Technology, PR China
- National Natural Science Foundation of China [51304031, 51302021]
- National Undergraduate Innovative Test Program of China
Lithium-rich layered oxides, xLi(2)MnO(3)center dot(1-x)LiMO2(M = Ni, Mn, Co), have been under intense investigation as high-performance cathode materials for lithium ion batteries due to their high discharge capacity, low cost and environmental benignity. Unfortunately, the commercialized application of these cathode materials have so far been hindered by their severe capacity and voltage fading during high voltage cycling (>4.5 V vs. Li/Li+). In an attempt to overcome these problems, herein, highly crystalline Al2O3 layer from the hydrolysis of aluminum isopropoxide are coated on 0.5Li(2)MnO(3)center dot 0.5LiNi(0.5)Co(0.2)Mn(0.3)O(2) with controlling the growth of Al2O3 crystals. The coin cell with bare cathode material delivers a high discharge capacity over 268.2 mAh g(-1) between 2.0 V and 4.8 V, while the Al2O3 coated cathode material shows the excellent cycling stability corresponding to 98% capacity retention after 100 cycles at 1C. More importantly, the highly crystalline Al2O3 coated cathode materials exhibit a significantly lower discharge voltage decay compared to the bare cathode materials, which could be ascribed to the suppression of the layered-to-spinel transformation by compact and highly crystalline Al2O3 layer. The results here will shed light on developing cathode materials with special structures and superior electrochemical properties for high-performance lithium ion batteries. (C) 2015 Elsevier B.V. All rights reserved.
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