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Effects of Co doping on Li[Ni0.5CoxMn1.5-x]O-4 spinel materials for 5 V lithium secondary batteries via Co-precipitation
- Issue Date
- Apr-2009
- Publisher
- ELSEVIER
- Keywords
- Li[Ni0.5Mn1.5]O-4; 5 V; Positive; Electrode; Lithium; Batteries
- Citation
- JOURNAL OF POWER SOURCES, v.189, no.1, pp.752 - 756
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 189
- Number
- 1
- Start Page
- 752
- End Page
- 756
- ISSN
- 0378-7753
- Abstract
- Effect of Co substitution for Mn on Li[Ni0.5CoxMn1.5-x]O-4 was investigated. Co-precipitation was employed to synthesize the [Ni0.25CoxMn0.75-x](OH)(2) as a precursor and it was fired with LiOH at 900 degrees C for 20 h in air. From Rietveld refinement of X-ray diffraction data and scanning electron microscopic examinations, it was found that the as-synthesized Li[Ni0.5CoxMn1.5-x]O-4 were crystallized in cubic spinel structure with Fd3m space group and the final products presented spherical secondary morphology (3 mu m in average). Electrochemical investigation revealed that Co3+ replacement for Mn4+ gave rise to improved rate and cycling performances probably due to the improved electronic conductivity and structural stability achieved by the presence of Co3+ in the spinel Li[Ni0.5CoxMn1.5-x]O-4.
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Related Researcher
- Sun, Yang Kook
- COLLEGE OF ENGINEERING (DEPARTMENT OF ENERGY ENGINEERING)