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

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Abstract

The LaF3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 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[Li0.2Mn0.54Ni0.13Co0.13]O2 nanoparticles were amorphous LaF3 layer with a thickness of about 10–30 nm. After the surface modification with LaF3 films, the coating layer served as a protective layer to suppress the side reaction between the positive electrode and electrolyte, and the Li[Li0.2Mn0.54Ni0.13Co0.13]O2 oxide demonstrated the improved electrochemical properties. The LaF3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 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 LaF3 played an important role to improve the cyclic stability and rate capacity of the Li-rich nickel manganese oxides.

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Acknowledgments

This work is financially supported by the National Natural Science Foundation of China (51405419).

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Correspondence to Cheng-Dong Li.

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Highlights

• Lanthanum Fluoride is used as the coating material.

• LaF3-coated Li[Li0.2Mn0.54Ni0.13Co0.13]O2 is synthesized successfully.

• The discharge capacity increases from 89.2 to 109.5 mAh g−1 at 5 C rate after LaF3 coating.

• The 100-cycle capacity retention is improved from 85.1 to 94.8 % after LaF3 coating.

• The LaF3 films restrain the side reaction between positive electrode and electrolyte during cycling.

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Li, CD., Yao, ZL., Xu, J. et al. Surface-modified Li[Li0.2Mn0.54Ni0.13Co0.13]O2 nanoparticles with LaF3 as cathode for Li-ion battery. Ionics 23, 549–558 (2017). https://doi.org/10.1007/s11581-016-1823-x

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  • DOI: https://doi.org/10.1007/s11581-016-1823-x

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