Fe-doped lithium-manganese spinel of the composition LiFe_0.05Mn_1.95O₄ was synthesized by means of a citric acid-aided route. The influence of annealing temperature on structural and morphological characteristics LiFe_0.05Mn_1.95O₄ is investigated by XRD and SEM methods. Specific and kinetic electrochemical characteristics of LiFe_0.05Mn_1.95O₄ in organic and aqueous electrolyte solutions were studied by galvanostatic cycling method and cyclic voltammetry. LiFe_0.05Mn_1.95O₄ samples annealed at temperatures of 700, 750, and 800 °C demonstrate specific capacity of 114, 102, and 109 mAh g⁻¹ at the cycling current density of 0.5 C, respectively. The best cycling stability and rate performance with discharge currents up to 50 C were obtained in a case of the sample annealed at 750 °C.

Graphical abstract

中文翻译：

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LiFe0.05Mn1.95O4作为锂离子电池高倍率正极材料

通过柠檬酸辅助途径合成了组成为LiFe _0.05 Mn _1.95 O ₄的Fe掺杂锂锰尖晶石。采用XRD和SEM方法研究了退火温度对LiFe _0.05 Mn _1.95 O ₄结构和形貌特征的影响。采用恒电流循环法和循环伏安法研究了LiFe _0.05 Mn _1.95 O ₄在有机和水电解质溶液中的比电化学特性和动力学电化学特性。在700、750和800℃温度下退火的LiFe _0.05 Mn _1.95 O ₄样品在0.5 C的循环电流密度下分别表现出114、102和109 mAh g ^{-1的比容量。}在 750 °C 退火的样品中，在高达 50 C 的放电电流下获得了最佳的循环稳定性和倍率性能。

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