Journal
ELECTROCHIMICA ACTA
Volume 116, Issue -, Pages 278-283Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.11.055
Keywords
Lithium-ion batteries; LiNi0.5Mn1.5O4; Ionic liquid; CuO coating; High-rate performance
Categories
Funding
- Science and Technology Project of Anhui Province [2013-01-077]
- Soft science project of Land and Resources of Anhui Province [2012021]
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The LiNi0.5Mn1.5O4 with different morphologies have been successfully prepared through co-precipitation route in mixed solution containing 1-dodecyl-3-methylimidazolium bromide ([C(12)mim]Br) and H2O with different mass ratios and followed by a solid reaction at high temperature. The morphology of LiNi0.5Mn1.5O4 varies with the increasing ratio of [C(12)mim]Br. These samples synthesized at three kinds of concentrations present flake-like morphology, agglomerated flake-like structure and polygon particles with size about 700 nm, respectively. The as-prepared LiNi0.5Mn1.5O4 with polygon structure presents the highest discharge capacity. The optimal LiNi0.5Mn1.5O4 sample was modified with 1, 3 and 5 wt.% CuO, respectively. The electrochemical testing results demonstrate 3 wt.% CuO-modified material had the capacity retention of higher than 95% after 100 cycles, and high capacity of 98.7 mAh g(-1) at 10 C rate, in comparison with the capacity retention of 83% and capacity of 63.6 mAh g(-1) for the pristine one. The remarkably improved rate performance and cycling stability can be attributed to CuO coating, which acts as an effective lithium-ion conductor and a protective material against corrosion from electrolyte. (C) 2013 Elsevier Ltd. All rights reserved.
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