Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 8, Pages 13223-13230Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.05.029
Keywords
Cathode material; High voltage; Lithium ion battery; Mg-doping
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Funding
- National Basic Research Program of China (973 Program) [2014CB643406]
- Major Special Plan of Science and Technology of Hunan Province, China [2011FJ1005]
- Fundamental Research Funds for the Central Universities of Central South University [2013zzts029]
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Mg-doped LiNi0.8Co0.15Al0.05O2 (NCA) cathode material is synthesized from Mg and Li co-coated LiNi0.8Co0.15Al0.05(OH)(2) precursor. X-ray diffraction (XRD) results indicate that the Mg-doped samples are indexed with hexagonal layered structure and no other impurity peak is found. Moreover, both the lattice parameters a and c increase as the quantity of Mg dopant grows. Scanning electron microscope (SEM) results reveal that the morphologies of the Mg-doped samples are almost the same as that of the pristine one. Electrochemical characterizations show that the Mg-doping leads to higher activation energy for the migration of Li-ions, and suppresses the phase transition between H2 and H3. Furthermore, the pristine and 1 at% Mg-doped samples are selected for studying the degradation behavior at higher upper cutoff potentials. When charged to higher cutoff potentials, the Mg-doped NCA cathode exhibits less capacity fading during cycling than the pristine one. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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