Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 805, Issue -, Pages 1034-1043Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.06.208
Keywords
Lithium-rich; LiAl5O8 coating; Layered oxides; Li1.2Mn0.54Ni0.13Co0.13O2
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Funding
- China Postdoctoral Science Foundation [2018M641188]
- Fundamental Research Funds for the Central Universities [FRF-TP-18-025A1]
- National Key R&D Program of China [2016YFB1101201]
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LiAl5O8-coated Li1.2Mn0.54Ni0.13Co0.13O2 cathode materials were synthesized by using the co-precipitation method along with a facile sol-gel coating process. Homogeneous and 3-5 nm thin LiAl5O8 film was formed on the LMNC surface. After the coating modification, discharge specific capacity, the initial Coulombic efficiency, and rate performance were improved to some extent. It was particularly important to note that the voltage decay of the battery after the charge and discharge cycle was well suppressed. Specifically, the 3 wt% LiAl5O8-coated electrode can deliver the initial discharge capacity of 243.5 mAh g(-1) with a low irreversible capacity loss of 51.1 mAh g(-1) and the initial Coulombic efficiency reached the maximum of 82.63% at 0.1 C rate. Although the 1 wt% LiAl5O8-coated electrode was cycled through 100 cycles at a rate of 0.5 C, the capacity retention rate was still up to 95.8%, while that of the LiAl5O8-free one was only 82.8%. The stable and thin LiAl5O8 coating layer protected the electrode structure from HF corrosion and other side reactions and reduced the oxygen loss (in the form of Li2O) by suppressing the initial activation of Li2MnO3. (C) 2019 Elsevier B.V. All rights reserved.
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