Abstract
Few studies on two-cations co-doped orthosilicate cathodes have been reported to date. Here, Mn and Ni co-doped Li2Fe0.8-xMn0.2NixSiO4 (x = 0.05 and 0.1) were synthesized using a solid state route. Both Mn and Ni can successfully enter into the Li2FeSiO4 lattice. The X-ray photoelectron spectroscopy (XPS) results show some certain evidence about the participation of foreign Mn and Ni in the charge-discharge reaction. Furthermore, at the conduction band minimum, Ni 3d-orbital contribution can reduce the band gap to 1.13 eV. These improvements can promote the Li+ insertion/de-insertion behavior in the co-doped material; consequently, when x = 0.1, Li2Fe0.7Mn0.2Ni0.1SiO4 shows the initial discharge capacities of 164 mAh g−1 and the corresponding Coulombic efficiency of 87.2%. Even at a rate of 80 mA g−1, the first discharge capacity can reach to 71.2 mAh g−1.
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Funding
This work was financially supported by the Natural Science Foundation of Shanxi Province (No. 201801D121046), Natural Science Foundation of Heilongjiang Province (No. LH2020B004), and Scientific Research Foundation for Youths of Harbin University (HUDF2019202, HUDF2019203).
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Li, SD., Gao, K. Insights into manganese and nickel co-doped Li2FeSiO4 cathodes for lithium-ion battery. Ionics 27, 2345–2352 (2021). https://doi.org/10.1007/s11581-021-04002-3
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DOI: https://doi.org/10.1007/s11581-021-04002-3