共 39 条
Electrochemical and rate performance study of high-voltage lithium-rich composition: Li1.2Mn0.525Ni0.175Co0.1O2
被引:219
作者:

Martha, Surendra K.
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机构:
Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

Nanda, Jagjit
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Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

Veith, Gabriel M.
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Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

Dudney, Nancy J.
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Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
机构:
[1] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA
关键词:
Lithium battery;
Cathode material;
Carbon nanofiber;
Rate performance;
CATHODE MATERIALS;
ION BATTERIES;
SOLID-SOLUTIONS;
OXIDE ELECTRODES;
CAPACITY;
LI;
0-LESS-THAN-X-LESS-THAN-1;
BEHAVIOR;
MN;
NI;
D O I:
10.1016/j.jpowsour.2011.10.019
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
We report electrochemical studies of high voltage cathodes composed of lithium rich "layered-layered" material having the nominal composition Li1.2Mn0.525Ni0.175Co0.1O2, or equivalently 0.6Li[Li1/3Mn2/3]O-2-0.4Li[Mn0.3Ni0.45Co0.25]O-2. These aspects were investigated by cyclic voltammetry studies in conjunction with electrochemical impedance spectroscopy measurements to understand the redox reactions involving multiple transition metals and their capacity contribution at higher voltages, up to 4.9V. Further, cathodes with 1.5 wt.% carbon nanofibers added to the Li1.2Mn0.525Ni0.175Co0.1O2 composite electrode showed stable reversible capacities of about 280 mAh g(-1) when cycled to 4.9V for more than 100 cycles, and almost a factor of two improvements in the rate performance compared to the electrode composition prepared using conventional composition (7.5% carbon black and 7.5% binder). Published by Elsevier B.V.
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页码:220 / 226
页数:7
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