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Fluorine gradient-doped LiNi0.5Mn1.5O4 spinel with improved high voltage stability for Li-ion batteries.
- Source :
-
Electrochimica Acta . Jun2017, Vol. 238, p237-245. 9p. - Publication Year :
- 2017
-
Abstract
- The fluorine gradient-doped LiNi 0.5 Mn 1.5 O 4 spinels are synthesized by a facile one-step method and the effect of heat treatment on their structure, morphology, and electrochemical performance are investigated. The results show that introduction of fluorine leads to a larger lattice parameter and particle size, and the formation of F-enriched surface. Whereas at 400 °C, the fluorine gradient-doped LiNi 0.5 Mn 1.5 O 4 sample exhibits an improved long-term cycling stability and high rate performance, due to the suppression of the reaction between electrolyte and cathode, resulting in a decrease in the total resistance and the formation of a thin, uniform and smooth film on the surface. As a result of in situ XRD with charged pristine and the fluorine gradient-doped samples, the similar thermal-decomposition pathways from the charged spinel to the final NiMn 2 O 4 -type spinel structure with a small amount of NiMnO 3 and α-Mn 2 O 3 are observed. In addition, the disappearance temperature of the charged spinel structures is at about 280 °C for the fluorine gradient-doped sample, exhibiting an improved thermal stability of high voltage cathode material. These results show that fluorine gradient-doped LiNi 0.5 Mn 1.5 O 4 sample is a promising positive electrode material for high performance lithium ion batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 238
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 122775925
- Full Text :
- https://doi.org/10.1016/j.electacta.2017.04.043