Abstract
Spinel LiNi0.5Mn1.5O4 (LNMO) has been considered as an appropriate cathode material for lithium-ion batteries because of its non-toxicity, high voltage platform and high energy density. Whereas, an occurrence of Jahn–Teller distortion in disordered structure of spinel is inevitable due to the presence of Mn3+ ion and the cycling behavior is inadequate. Hence, a citric acid-aided method is used to address above question by adding yttrium dopant. A series of characterization methods are measured. Characterization results display that Y3+ doping decreases lattice parameter and Mn3+ content, and results in a decrease in grain size for Y-doped LNMO samples. These changes by Y3+ doping can reduce the degree of electrochemical polarization and enhance insertion and extraction reaction of Li+. On the other hand, the changes can also improve structural stability and retard the Jahn–Teller distortion. Therefore, the effect of Y3+ doping on crystalline structure, grain morphology and Mn3+ concentration is revealed and displayed a positive effect on enhancing rate performance and cycling stability of LNMO. Compared to other three LNMO samples, LiNi0.49Mn1.49Y0.02O4 LNMO sample exhibits best rate capacity and delivers highest discharge retention rate of 98.8% after 100 cycles at 1 C. Our research demonstrates that yttrium doping to enhance the electrochemical properties of LiNi0.5Mn1.5O4 cathode materials is an efficacious route.
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Acknowledgements
Authors gratefully acknowledge financial support from Natural Science Foundation of China (52063005), Science and Technology Project of Guizhou (2016/5667) and (2021488), Science and Technology Foundation of Guizhou Province (2019/5635).
Funding
This work was financially supported by Natural Science Foundation of China (52063005), Science and Technology Project of Guizhou (2016/5667) and (2021488), Science and Technology Foundation of Guizhou Province (2019/5635).
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DZ: Experimental ideas and scheme design, Conducting research and investigation process. FL: Experimental ideas and scheme design, Writing-Original Draft preparation, Data curation, Writing—Reviewing and Editing. JG: Funding acquisition, Provision of study materials, reagents and materials. JS: Supervision, Writing-Reviewing and Editing.
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Zhou, D., Lin, F., Song, J. et al. Exploring the action of rare-earth yttrium dopant on enhancing electrochemical performance of LiNi0.5Mn1.5O4 material. J Mater Sci: Mater Electron 33, 16621–16637 (2022). https://doi.org/10.1007/s10854-022-08558-2
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DOI: https://doi.org/10.1007/s10854-022-08558-2