Improved lithium-ion battery performance of LiNi0.5Mn1.5-xTixO4 high voltage spinel in full-cells paired with graphite and Li4Ti5O12 negative electrodes
- Authors
- Kim, Jung-Hyun; Pieczonka, Nicholas P. W.; Sun, Yang Kook; Powell, Bob R.
- Issue Date
- Sep-2014
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Ti substitution; High voltage (5 V) spinel; Full cells; Graphite; Li4Ti5O12; Li-ion batteries
- Citation
- JOURNAL OF POWER SOURCES, v.262, pp.62 - 71
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 262
- Start Page
- 62
- End Page
- 71
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/25797
- DOI
- 10.1016/j.jpowsour.2014.03.107
- ISSN
- 0378-7753
- Abstract
- The effect of Ti-substitution on the electrochemical properties of LiNi0.5Mn1.5-xTixO4 was investigated by using half-cells paired with lithium metal, and full-cells paired with either graphite or Li4Ti5O12 (LTO) negative electrodes. In half-cells, Ti-substitution increased the operation voltage, but reduced the specific capacity. While some improvements in performance, such as higher operation voltage and less self-discharge, could be measured in the half-cells, the critical advantages of the Ti-substitution were readily observed in full-cell cycling. Compared with Ti-free LiNi0.5Mn1.5O4, the LiNi0.5Mn1.5-xTixO4 electrodes delivered improved full-cell performance whether paired with graphite or LTO negative electrodes; greater cycle life, higher cell operating voltage, and lower voltage polarization on charging/discharging. Based on relatively low self-discharge and high Coulombic efficiency, it is suggested that the Ti-substitution in LiNi0.5Mn1.5-xTixO4 retards electrolyte oxidation. In addition, scanning electron microscopy (SEM) images revealed that cycle-aged LiNi0.5Mn1.2TiO3O4 particle surfaces remained relatively clean compared with those of LiNi0.5Mn1.5O4 particles. These results are consistent with the hypothesis that Ti-substitution reduces electrolyte oxidation and retards or prevents some of the degradative parasitic reactions at the electrode/electrolyte interfaces during battery cell operation.
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