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Surface modification of cathode material 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2 by alumina for lithium-ion batteries

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Abstract

In an attempt to overcome the irreversible capacity loss occurred during the first cycle and stabilize the surface structure, an alumina coating layer has been triumphantly prepared on the surface of 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2 cathode material with different amounts (1, 2, and 3 wt%) through a simple hydrolysis reaction, followed by an annealing process. The results reveal that the coated materials have a higher crystallinity and the particles are evenly distributed. As a cathode material for lithium-ion batteries, the 2-wt% coated sample delivers initial discharge specific capacity of 211.7 mAh g−1 at a rate of 1 C between 2.0 and 4.8 V with an initial columbic efficiency of 73.2%. Meanwhile, it exhibits the highest discharge specific capacity of 206.2 mAh g−1 with 97.4% capacity retention after 100 cycles at and much elevated rate capability compared to uncoated material. The excellent cycling stability and more superior rate property can be ascribed to alumina coating layer, which has a surface stabilization effect on these cathode materials, lessening the dissolution of metal ions. The electrochemical impedance and cyclic voltammetry studies indicate that coated by alumina improved the kinetic performance for lithium-rich layered materials, showing a prospect for practical lithium battery application.

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Funding

This research was financially supported by the Shanghai Science and Technology Committee (Grant number 16020500800), Shanghai Natural Science Fund (Grant number 15ZR1418100), and Natural Science Foundation of China (51402187).

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Correspondence to Qunjie Xu or Chunyan Lai.

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The authors declared that they have no conflict of interest.

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Li, Y., Chang, X., Xu, Q. et al. Surface modification of cathode material 0.5Li2MnO3·0.5LiMn1/3Ni1/3Co1/3O2 by alumina for lithium-ion batteries. J Nanopart Res 20, 22 (2018). https://doi.org/10.1007/s11051-017-4114-1

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  • DOI: https://doi.org/10.1007/s11051-017-4114-1

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