Surface-modified Li[Li0.2Mn0.54Ni0.13Co0.13]O2 nanoparticles with LaF3 as cathode for Li-ion battery

The LaF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 nanoparticles were synthesized via co-precipitation method followed by simple chemical deposition process. The crystal structure, particle morphology, and electrochemical properties of the bare and coated materials were studied by XRD, SEM, TE...

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Bibliographic Details
Published in:Ionics 2017-03, Vol.23 (3), p.549-558
Main Authors: Li, Cheng-Dong, Yao, Zhi-Lei, Xu, Jin, Tang, Pei, Xiong, Xin
Format: Article
Language:English
Subjects:
Chemical precipitation
Chemistry
Chemistry and Materials Science
Coated electrodes
Condensed Matter Physics
Crystal structure
Electrochemical analysis
Electrochemistry
Energy Storage
Lanthanum fluorides
Lithium-ion batteries
Manganese
Nanoparticles
Optical and Electronic Materials
Original Paper
Rechargeable batteries
Renewable and Green Energy
Thickness
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Summary:The LaF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 nanoparticles were synthesized via co-precipitation method followed by simple chemical deposition process. The crystal structure, particle morphology, and electrochemical properties of the bare and coated materials were studied by XRD, SEM, TEM, charge–discharge tests. The results showed that the surface coating on Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 nanoparticles were amorphous LaF 3 layer with a thickness of about 10–30 nm. After the surface modification with LaF 3 films, the coating layer served as a protective layer to suppress the side reaction between the positive electrode and electrolyte, and the Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 oxide demonstrated the improved electrochemical properties. The LaF 3 -coated Li[Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 ]O 2 electrode delivered the capacities of 270.5, 247.9, 197.1, 170.0, 142.7, and 109.5 mAh g −1 at current rates of 0.1, 0.2, 0.5, 1, 2, and 5 C rate, respectively. Besides, the capacity retention was increased from 85.1 to 94.8 % after 100 cycles at 0.5 C rate. It implied surface modification with LaF 3 played an important role to improve the cyclic stability and rate capacity of the Li-rich nickel manganese oxides.
ISSN:0947-7047
1862-0760
DOI:10.1007/s11581-016-1823-x