선양국
2018-03-19T06:02:49Z
2018-03-19T06:02:49Z
2014-09
JOURNAL OF POWER SOURCES, 2014, 262, P.62-71
0378-7753
https://www.sciencedirect.com/science/article/pii/S0378775314004303
http://hdl.handle.net/20.500.11754/48960
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. (C)2014 Elsevier B.V. All rights reserved.
The authors would like to thank Michael P. Balogh and Anne Dailly in the Chemical & Materials Systems Laboratory for SEM and BET analyses, respectively.
en
ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Ti substitution
High voltage (5 V) spinel
Full cells
Graphite
Li4Ti5O12
Li-ion batteries
AGING MECHANISMS
CAPACITY LOSS
DISSOLUTION
ELECTROLYTES
CHEMISTRY
CATHODES
BEHAVIOR
P4(3)32
MN
TI
Improved lithium-ion battery performance of LiNi0.5Mn1.5-xTixO4 high voltage spinel in full-cells paired with graphite and Li4Ti5O12 negative electrodes
Article
262
10.1016/j.jpowsour.2014.03.107
62-71
JOURNAL OF POWER SOURCES
Kim, Jung-Hyun
Pieczonka, Nicholas P.W.
Sun, Yang-Kook
Powell, Bob R.
2014034335
S
COLLEGE OF ENGINEERING[S]
DEPARTMENT OF ENERGY ENGINEERING
yksun