Journal
ELECTROCHIMICA ACTA
Volume 192, Issue -, Pages 340-345Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.01.176
Keywords
lithium ion batteries; cathode material; concentration gradient oxide; surface coating; lithium phosphorus oxynitride
Categories
Funding
- National High Technology Research and Development Program of China (863 Program) [2012AA110203]
- Applied Technology Research and Development Program of Harbin [2013DB4AP030]
- National Science Foundation of China [51202047]
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A facile high-temperature solid phase approach is employed to coat lithium phosphorus oxynitride (LiPON) layer on the concentration gradient Li[Ni0.73Co0.12Mn0.15]O-2 material with Ni-rich core and Ni-poor surface. X-ray diffraction, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy demonstrate that LiPON forms an even coating with similar to 4 nm of thickness on the surface without destroying the bulk structure of Li[Ni0.73Co0.12Mn0.15]O-2 material. The LiPON-coated concentration gradient Li[Ni0.73Co0.12Mn0.15]O-2 material exhibits a capacity retention of 87.3% at 25 degrees C after 1000 cycles and 89.9% at 55 degrees C after 250 cycles, which is 36.1% and 17.2% higher than that of pristine Li[Ni0.73Co0.12Mn0.15]O-2 material, respectively, under the same operating conditions. This significantly improved cycling performance is ascribed to the noncrystalline LiPON layer on the surface, which provides a reliable interface protection. The LiPON coating is an effective approach to enhancing the electrochemical performance of electrode materials for lithium ion batteries. (C) 2016 Elsevier Ltd. All rights reserved.
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