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Site dependent multicomponent doping strategy for Ni-rich LiNi1-2yCoyMnyO2 (y = 1/12) cathode materials for Li-Ion batteries

Abstract

Atomic substitution and doping are some of the most adopted strategies to improve the electrochemical performance of layered cathode materials for Li–ion batteries (LIBs). In this work, we report a comprehensive study on the effects of seven dopants (Al, Ga, Mg, Si, Ti, V and Zr) on the well–known drawbacks of Ni–rich LiNi1–2yCoyMnyO2 (NCM) (y≤0.1), one of the most promising next–generation cathode materials for LIBs: phase instability, Li–Ni exchange, Ni segregation, lattice distortion, and oxygen evolution. Our results show that there is not a single dopant that can solve all the problems at the same time and, moreover, they often improve certain properties but have no effect or even worsen others. By comparing different doping sites, we found a strong site preference due to the tradeoff between Mn and Co concentrations. This site preference indicates that a multicomponent doping strategy should be adopted at both Mn and Co sites. Finally, a rationale for the optimization of the overall electrochemical performance of Ni–rich NCM is proposed, which will ultimately provide a practical guidance (Ti or Zr at Co site and Al at Mn site) for the design of new Ni–rich layered cathode materials for LIBs.

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Publication details

The article was received on 29 Sep 2017, accepted on 08 Nov 2017 and first published on 10 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA08618K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Site dependent multicomponent doping strategy for Ni-rich LiNi1-2yCoyMnyO2 (y = 1/12) cathode materials for Li-Ion batteries

    C. Liang, F. Kong, R. Longo, C. Zhang, Y. Nie, Y. Zheng and K. Cho, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA08618K

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