Surface modification of LiNi0.5Mn1.5O4 by ZrP2O7 and ZrO2 for lithium-ion batteries
- Authors
- Wu, H. M.; Belharouak, I.; Abouimrane, A.; Sun, Y. -K.; Amine, K.
- Issue Date
- May-2010
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Lithium-ion batteries; LiNi0.5Mn1.5O4; ZrO2 coating; ZrP2O7 coating
- Citation
- JOURNAL OF POWER SOURCES, v.195, no.9, pp.2909 - 2913
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 195
- Number
- 9
- Start Page
- 2909
- End Page
- 2913
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/175010
- DOI
- 10.1016/j.jpowsour.2009.11.029
- ISSN
- 0378-7753
- Abstract
- The spinet LiNi0.5Mn1.5O4 has been surface modified separately with 1.0 wt.% ZrO2 and ZrP2O7 for the purpose of improving its cycle performance as a cathode in a 5-V lithium-ion cell. Although the modifications did not change the crystallographic structure of the surface-modified samples, they exhibited better cyclability at elevated temperature (55 degrees C) compared with pristine LiNi0.5Mn1.5O4. The material that was surface modified with ZrO2 gave the best cycling performance, only 4% loss of capacity after 150 cycles at 55 degrees C. Electrochemical impedance spectroscopy demonstrated that the improved performance of the ZrO2-surface-modified LiNi0.5Mn1.5O4 is due to a small decrease in the charge transfer resistance, indicating limited surface reactivity during cycling. Differential scanning calorimetry showed that the ZrO2-modified LiNi0.5Mn1.5O4 exhibits lower heat generation and higher onset reaction temperature compared to the pristine material. The excellent cycling and safety performance of the ZrO2-modified LiNi0.5Mn1.5O4 electrode was found to be due to the protective effect of homogeneous ZrO2 nano-particles that form on the LiNi0.5Mn1.5O4, as shown by transmission electron microscopy.
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