Concentration‐Gradient Structural LiFe<sub>0.5</sub>Mn<sub>0.5</sub>PO<sub>4</sub>/C Prepared via Co‐precipitation Reaction for Advanced Lithium‐Ion Batteries
Xiaoyan Jiang, Lanyan Li, Xianyou Wang, Zhigao Luo
Abstract
Abstract The intrinsically low electronic conductivity and slow ion diffusion kinetics limit further development of olivine LiFe x Mn 1‐x PO 4 cathode materials. In this paper, with the aim of improving the performance of such materials and alleviating the Jahn‐Taller effect of Mn 3+ ion, a bimetallic oxalate precursor with gradient distribution of elemental concentration followed with an efficient process is applied to synthesize LiFe 0.5 Mn 0.5 PO 4 nanocomposite. The results shown that with certain structural modulation of the precursor, the discharge capacity of synthesized LiFe 0.5 Mn 0.5 PO 4 increased from 149 mAh g −1 to 156 mAh g −1 at 0.1 C, the cycling capacity was also remarkably improved. the Fe 0.5 Mn 0.5 C 2 O 4 ⋅ 2H 2 O‐1 precursor with gradient distribution of elemental concentration effectively restricts the reaction between electrode material and electrolyte, thereby alleviates the dissolution of Mn 3+ ion, reduces the decay of capacity and improves the stability of the material.