LiFePO₄-based samples with impurities of H₂O, Li₃PO₄, and Fe₂P were prepared from precursors with composition of LiFePO₄, Li_1+xFe(PO₄)_1+x/3 (0 ≤ x ≤ 0.1), and LiFe_1-yPO₄ (0 ≤ y ≤ 0.1) via a solution method. The compositions, crystalline structures, and morphology of the prepared powders were investigated with ICP-AES, XRD, and SEM, respectively. In order to reveal the effects of impurities of H₂O, Li₃PO₄ and Fe₂P on the amount of Fe²⁺ dissolution in LiPF₆ electrolyte and on the cycling performance of LiFePO₄/LiPF₆ electrolyte/MCMB cells, LiFePO₄-based electrodes prepared from various prepared powders with various moisture contents were dipped in LiPF₆ electrolyte of various temperatures for two weeks. The electrochemical properties of the prepared studied with cyclic voltammetry and capacity retention study. The retention studies were/will be carried out at various temperatures with both of LiFePO₄/Li and LiFePO₄/MCMB cells comprised with LiFePO₄-based electrodes containing various impurities. The anodes and cathodes obtained from the cycled cells will be studied with XPS and FTIR to uncover the effects of the impurities on the cycling performance of the LiFePO₄/LiPF₆ electrolyte/MCMB cells at elevated temperatures.

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