Abstract
AbstractTo decrease the cost of lithium‐ion cathode materials, cobalt‐free Li‐Fe‐Ni‐Mn‐O (FeAl000) was synthesized by a facile sol–gel method by using citric acid as the chelating agent. To enhance the electrochemical performance of FeAl000, low‐costing and environmentally friendly aluminum was added as a dopant. The Al‐doped Li‐Fe‐Al‐Ni‐Mn‐O (FeAl015) material exhibited excellent electrochemical performance. The charge/discharge capacity and corresponding differential capacity curves suggested that Al‐doping activated the transformation of Mn4+ into Mn3+, and the activated Mn3+/Mn4+ redox/oxide couple contributed to an increase in the discharge capacity. X‐ray photoelectron spectroscopy analyses demonstrated the transformation of Mn4+ into Mn3+/2+. The Nyquist and Bode curves obtained by electrochemical impedance spectroscopy indicated that Al doping enhanced electron transfer and somewhat hampered formation of the solid–electrolyte‐interphase layer during cycling.
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