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Structural and electrochemical properties of LiNi0.5Mn0.5− x Al x O2 (x =0, 0.02, 0.05, 0.08, and 0.1) cathode materials for lithium-ion batteries
- Source :
-
Solid State Ionics . Apr2009, Vol. 180 Issue 4/5, p398-404. 7p. - Publication Year :
- 2009
-
Abstract
- Abstract: Layered LiNi0.5Mn0.5− x Al x O2 (x =0, 0.02, 0.05, 0.08, and 0.1) series cathode materials for lithium-ion batteries were synthesized by a combination technique of co-precipitation and solid-state reaction, and the structural, morphological, and electrochemical properties were examined by XRD, FT-IR, XPS, SEM, CV, EIS, and charge–discharge tests. It is proven that the aliovalent substitution of Al for Mn promoted the formation of LiNi0.5Mn0.5− x Al x O2 structures and induced an increase in the average oxidation number of Ni, thereby leading to the shrinkage of the lattice volume. Among the LiNi0.5Mn0.5− x Al x O2 materials, the material with x =0.05 shows the best cyclability and rate ability, with discharge capacities of 219, 169, 155, and 129 mAh g−1 at 10, 100, 200, and 400 mA g−1 current density respectively. Cycled under 40 mA g−1 in 2.8–4.6 V, LiNi0. 5Mn0.45Al0.05O2 shows the highest discharge capacity of about 199 mAh g−1 for the first cycle, and 179 mAh g−1 after 40 cycles, with a capacity retention of 90%. EIS analyses of the electrode materials at pristine state and state after first charge to 4.6 V indicate that the observed higher current rate capability of LiNi0. 5Mn0.45Al0.05O2 can be understood due to the better charge transfer kinetics. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 01672738
- Volume :
- 180
- Issue :
- 4/5
- Database :
- Academic Search Index
- Journal :
- Solid State Ionics
- Publication Type :
- Academic Journal
- Accession number :
- 37346368
- Full Text :
- https://doi.org/10.1016/j.ssi.2009.01.009