期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 453, 期 1-2, 页码 352-355出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2006.11.087
关键词
lithium secondary battery; cathode material; AlPO4 coating; LiNi0.8Co0.2O2
The AlPO4-coated layered LiNi0.8Co0.2O2 samples were prepared, and characterized by powder X-ray diffraction, high-resolution transmission electron microscopy, differential scanning calorimetry, X-ray photoelectron, electrochemical impedance spectroscopy and electrochemical test. It is found that the AlPO4 layer is amorphous with the thickness of 5 nm. The AlPO4-coated LiNi0.8Co0.2O2 cathode material has increased reversible capacity, stabilized cycling performance, improved high-temperature performance, which are attributed to can minimize the harmful side reactions within the batteries by placing a protective barrier layer between the oxidizing cathode material and liquid electrolyte and the decrease of electrochemical impedance. (c) 2006 Elsevier B.V. All rights reserved.
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