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Achieving superior electrochemical performances on LiNi0.8Co0.15Al0.05O2 cathode materials by cadmium oxide modification.
- Source :
-
Materials Chemistry & Physics . Jan2020, Vol. 240, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- Cadmium oxides (CdO), an important semiconductor material, have many superior properties when used as a cathode material for nickel-cadmium batteries. Here, the coating and the doped co-modified LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode are constructed by a continuous wet chemical process and a high-temperature sintering process, wherein the Cd2+ are uniformly doped in a gradient form and the CdO protective layer is distributed on the outer surface of secondary particles. The Cd-modified NCA material has more stable interfacial and crystal lattice structure, thereby inhibiting harmful phase transitions and side-reactions. Accordingly, the modified sample has excellent electrochemical performance and maintaining a complete spherical morphology during long cycling compared to the pristine sample. In addition, as a pillar ion, cadmium increases the plate spacing and lithium-ion diffusion kinetics. The electrochemical results show that the capacity retention of the modified sample Cd-2000 reached 96.5% and 90.6% after 100 cycles and 200 cycles respectively at 1 C. At the high current rate of 8 C, the initial capacity and retention (100 cycles, 3.0–4.3 V) reach 166.2 mAh g−1 and 95.2%, respectively. Besides, the results of electrochemical impedance spectroscopy (EIS) reveal that CdO modification could decrease the resistance of the cell polarization and impedance increment upon cycling. Image 1 • The Cd-modified NCA cathode is prepared by simple wet chemical precipitation-calcination techniques. • The modification of LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode was achieved by the synergistic effect of CdO coating and Cd ion doping. • After modification, the interface and crystal structure stability is improved. • The Cd-modified cathode material achieves excellent electrochemical performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 240
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 141639187
- Full Text :
- https://doi.org/10.1016/j.matchemphys.2019.122029