Abstract
LiNi0.5Mn1.5O4 (LNMO), as a promising cathode material for high energy density lithium-ion batteries, has been limited by its intrinsic side effects with electrolytes at high voltage resulting in serious Mn dissolution and capacity attenuation. To address this issue, a sol–gel method was used to prepare LiNi0.49Mn1.49−xSrxY0.02O4 (x = 0.02, 0.04, 0.06). In addition, the LNMO material co-doped with Sr and Y was also studied for its crystal structure, microscopic morphology, and electrochemical properties. Structural characterization has revealed that the doping of Sr2+ and Y3+ into the LNMO material results in a reduction in particle size, a decrease in the content of Mn3+, and an increased proportion of the (100) crystal plane of the LNMO material. These modifications contribute to an improvement in the electrochemical performance of the LNMO material. The LiNi0.49Mn1.45Sr0.04Y0.02O4 LNMO sample showed the optimal electrochemical performance, with a discharge capacity of 131.84 mAh g−1 after 100 cycles at 1 C, retaining 95.55% of its initial capacity, and achieving a specific capacity of 104.79 mAh g−1 at 5 C.
Graphical abstract
New Sr and Y co-doping strategy was designed and LiNi0.49Mn1.49−xSrxY0.02O4 (x = 0.02, 0.04, 0.06) sample was obtained via citric acid aided route to enhance the electrochemical property of LiNi0.5Mn1.5O4 cathode material for the first time.
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The data that support the findings of this study are available on request from the corresponding authors.
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Acknowledgements
This work was supported by the Natural Science Foundation of China (52063005), Science and Technology Support Project of Guizhou Province (2021488), Guizhou Province High-level Innovative Talents Training Project (2016/5667). Science and Technology Support Project of Guizhou Province, 2023356, Jianbing Guo.
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XZ contributed to experimental ideas and scheme design, writing-original draft preparation, data curation, writing-reviewing and editing. XH contributed to instructional support. JS contributed to writing-reviewing and editing. HW contributed to instructional support, writing-reviewing. JG contributed to funding acquisition, provision of study materials, reagents and materials.
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Zi, X., Huang, X., Song, J. et al. Sr–Y co-doped LiNi0.5Mn1.5O4 cathode material with modified crystal and improved electrochemical performance. J Mater Sci 58, 12271–12287 (2023). https://doi.org/10.1007/s10853-023-08793-w
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DOI: https://doi.org/10.1007/s10853-023-08793-w