Journal
JOURNAL OF POWER SOURCES
Volume 313, Issue -, Pages 1-8Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.02.015
Keywords
Re-heating; Ni-rich compound; Cathode; Lithium; Batteries; Surface chemistry
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology of Korea [NRF-2014R1A2A1A11051197]
- Human Resources Development of the Korean Institute of Energy Technology Evaluation and Planning (KETEP) grant
- Korean government Ministry of Trade, Industry Energy [20154030200630]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20154030200630] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
The re-heating effect for Ni-rich Li[Ni0.7Mn0.3]O-2 is investigated because the process is required in surface modification and removal of adhered water molecules. A representative binary Ni-rich Li[Ni0.7Mn0.3]O-2 (in which cationic distribution in Li layers is not affected by heteroelements) is selected and synthesized via co-precipitation. The as-synthesized Ni-rich Li[Ni0.7Mn0.3]O-2 is re-heated at 200 degrees C, 400 degrees C, and 600 degrees C, so that the resulting structural and electrochemical properties are compared by means of X-ray diffraction, transmission electron microscopy, time of flight-secondary ion spectroscopy, thermogravimetric analysis, high temperature X-ray diffraction, and electrochemical tests. Raising the re-heating temperature increases the occupancy of Ni2+ in Li layers and accelerates the aggregation of lithium related compounds such as Li2CO3 and LiOH towards the particle surface. Among the several conditions tested, re-heating at 200 degrees C results in a negligible change in the crystal structure; specifically, Ni2+ occupation in Li layers, higher capacity with good reversibility upon cycling tests, better rate capability, and thermal properties. Therefore, re-heating of cathode active materials, in particular Ni-rich compositions, should be considered to stabilize both electrode performances and thermal properties. (c) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available