Coprecipitation and Characterization of Na Substituted LiMn0.5Ni0.5O2 for Lithium ion Battery Cathodes

Le Phan Cam Linh, Nguyen Van Ky, Pham Duy Long, Giang Hong Thai, Dang Thi Thanh Le, Nguyen Si Hieu

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Published Sep 23, 2020
DOI: https://doi.org/10.25073/2588-1140/vnunst.5021

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CAM LINH, Le Phan et al. Coprecipitation and Characterization of Na Substituted LiMn0.5Ni0.5O2 for Lithium ion Battery Cathodes. VNU Journal of Science: Natural Sciences and Technology, [S.l.], v. 36, n. 3, sep. 2020. ISSN 2588-1140. Available at: <https://js.vnu.edu.vn/NST/article/view/5021>. Date accessed: 25 apr. 2024. doi: https://doi.org/10.25073/2588-1140/vnunst.5021.
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Vol 36 No 3
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Original Articles

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Abstract

In this study, Li1-xNaxMn0.5Ni0.5O2 materials were successfully synthesized by co-precipitation following by solid state reaction method. X-ray powder diffraction analyses showed that the Li1-xNaxMn0.5Ni0.5O2 materials were single-phase and crystallized in a rhombohedral structure with a space group of R–3m at Na substitution concentrations of 0–20%. When increasing the concentration of Na substitution to 30%, diffraction peaks of Na2Mn3O7 as an impurity phase appeared in the X-ray diffraction pattern of the synthesized material. Rietveld refinements of the X-ray diffraction patterns revealed that the substitutions of Na for Li resulted in significant increments of the lattice constant c and slight increments of the lattice constant a. The results of galvanostatic charge/discharge measurements showed that the substitutions reduced the specific capacity but improved the rate capability of the Li0.8Na0.2Mn0.5Ni0.5O2 in comparison with the LiMn0.5Ni0.5O2 material.
Keywords: lithium ion battery, layered transition metal oxide, Na subsitution.

References

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