期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 784, 期 -, 页码 1311-1322出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.072
关键词
Ions conductive materials; Li(3)PO(4 )coating layer; Nickel-rich cathode material; SEI film; Lithium ions migration
资金
- National Natural Science Foundation of China [51772119, 51202083]
In this work, an excellent ionic conductor Li3PO4 was deposited on the surface of LiNi0.8Mn0.1Co0.1 O-2 by a hydrothermal treatment method. This method avoided contact between the active material and water, and required only one step of calcination to obtain the product. The X-ray photoelectron spectroscopy (XPS) results indicated that the Li3PO4 coating layer had a protective effect which can greatly suppress the reaction of active material with the air and the electrolyte. Besides that, the Li-3 PO4 layer provided fast channels for lithium ions migration, and effectively inhibited the growth of SEI film and decreased the charge transfer resistance at the interface between the electrode and electrolyte. Therefore, the coated materials had excellent rate capability and cycle performance. The lithium ions diffusion (DLi+) of H-LPO&NMC was enhanced to the range of 10(-13) -10(-12) cm(2) s(-1), while that of the bared material was only about 10(-15 )-10(-13) cm(2) s(-1). (C) 2019 Elsevier B.V. All rights reserved.
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