Abstract: FeNb₁₁O₂₉ is a promising anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity (400 mAh·g^-1). However, the reported practical capacities of FeNb₁₁O₂₉ are only 168 mAh·g^-1 to 273 mAh·g^-1. Therefore, it is very necessary to further improve the electrochemical performance of FeNb₁₁O₂₉. A simple and effective Ga-doped method was demonstrated in this study, which enhanced the electrochemical performances of FeNb₁₁O₂₉ materials successfully. XRD results show that Ga-doped doesn't change the orthogonal shear ReO₃ crystal structure of FeNb₁₁O₂₉. Scanning electron microscopy characterization indicats that no significant change in morphology is observed. Ga³⁺ could replace Fe³⁺ in FeNb₁₁O₂₉, the electronic conductivity of Ga_0.2Fe_0.8Nb₁₁O₂₉ is enhanced by two orders of magnitude compared with FeNb₁₁O₂₉. Consequently, Ga_0.2Fe_0.8Nb₁₁O₂₉ exhibits excellent electrochemical performances. At the current density at 0.1 C, the charge capacity of Ga_0.2Fe_0.8Nb₁₁O₂₉ reaches 290 mAh·g^-1, which remains 145 mAh·g^-1 when the current density rose to 5 C. Moreover, Ga_0.2Fe_0.8Nb₁₁O₂₉ presents outstanding cycling stability with a capacity retention of 91.0% at 5 C after 1 000 cycles. In contrast, undoped FeNb₁₁O₂₉ only possesses a charge capacity of 107 mAh·g^-1 with a capacity retention of 55.9% at 5 C after 1 000 cycles. The research indicates that the electrochemical performances of FeNb₁₁O₂₉improves significantly by Ga-doped, and Ga_0.2Fe_0.8Nb₁₁O₂₉ has wide application in LIBs in the future.

Key words: FeNb₁₁O₂₉, Ga-doped, lithium-ion battery, electrochemical performance, current density