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The Cu–Y co-doping LiNi0.5Mn1.5O4 with modified morphology and enhanced electrochemical property for a 5 V lithium-ion battery

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Abstract

LiNi0.5−xCuxMn1.48Y0.02O4 (x = 0.02, 0.03, 0.04) and LiNi0.5Mn1.5O4 (LNMO) samples were prepared successfully via the sol–gel method. The lattice parameter and the degree of Ni/Mn disorder for LNMO samples were increased by doping Cu2+ and Y3+ ions, which is benefit for improving lithium-ion diffusion rate. The Cu–Y co-doped samples possessed truncated octahedral morphologies with (111) facet and exposed (100) facet by modified the co-doped Cu–Y content. The (100) facet helped to accelerate the Li+ ion diffusion while the (111) facet inhibited the dissolution of transition metals at the solid interface. The LiNi0.47Cu0.03Mn1.48Y0.02O4 (0.03 Cu–Y) sample exhibited high initial discharge specific capacity of 145.7 mAh g−1 which was far higher than that of pristine sample (113.8 mAh g−1). After 100 cycles at 1 C, the 0.03 Cu–Y sample retained discharge specific capacity of 137.2 mAh g−1 with superior retention of 96.79% while the undoped sample only retained 108.8 mAh g−1 and the retention is 95.79% at the same condition. The improved electrochemical property of the Cu–Y co-doped sample maybe attribute to the stable structure that decrease Ohmic polarization and the suitable morphology that is conducive to accelerate the Li+ ion diffusion.

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Acknowledgements

Authors gratefully acknowledge financial support from Science and Technology Project of Guizhou (2016/5667) and (2021488), Science and Technology Foundation of Guizhou Province (2019/5635, Natural Science Foundation of China (52063005).

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Correspondence to Hongming Wu or Jianbing Guo.

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Lin, F., Wu, H., Chen, T. et al. The Cu–Y co-doping LiNi0.5Mn1.5O4 with modified morphology and enhanced electrochemical property for a 5 V lithium-ion battery. J Mater Sci: Mater Electron 33, 283–297 (2022). https://doi.org/10.1007/s10854-021-07292-5

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