Abstract
The LiNi0.5Mn1.5O4 (LNMO) is an ideal cathode material of lithium-ion battery due to its high operating voltage. However, the corrosion of the electrolyte at high voltage is also a key issue for the LNMO cathode. In current work, the CeF4 were used to coat LNMO pristine via a simple calcining synthesis process. The microstructure and morphology of the pristine and CeF4-coated samples were studied by XRD, FTIR, XPS SEM, and TEM. The microstructure and morphology analysis show that CeF4 successfully coats on the surface of LNMO and forms a uniform coating layer. The CeF4 layers have little effect on the crystal structure of the LNMO and surface characters keep stable. The electrochemical performance study revealed that the CeF4-coated samples owned higher rate capacity and galvanostatic change–discharge capacity at 5C because the CeF4 layer was benefit to Li+ diffusion that decrease the polarization resistance. Moreover, the CeF4-3 has best cycling performance and rate capacity among all samples. After 100 charge–discharge cycles, the specific discharge capacity of CeF4-3 is still maintained 120 mAh/g with 97.6% capacity retention, while the pristine LNMO is only 97 mAh/g with 94.0% capacity retention. Therefore, CeF4 can be regarded as a promising anode modification material to improve the electrochemical performance.
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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).
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TC: Conducting research and investigation process, Data curation, Writing—original draft, writing-reviewing and editing. HW: Experimental ideas and scheme design, provision of study materials, reagents and materials. DZ: Supervision. YZ: Supervision WY: Supervision JS: Supervision JG: Supervision, funding acquisition.
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Chen, T., Wu, H., Zhou, D. et al. The CeF4-coated spinel LiNi0.5Mn1.5O4 with improved electrochemical performance for 5 V lithium-ion batteries. J Mater Sci: Mater Electron 33, 11712–11724 (2022). https://doi.org/10.1007/s10854-022-08137-5
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DOI: https://doi.org/10.1007/s10854-022-08137-5