LAUSR

The electrochemical performances and process mechanisms of Zn/LiFePO 4 cells in a slightly acid 1.9 M Li 2 SO 4 -0.5 M ZnSO 4 aqueous solution are investigated. The results show that the hydrogen depletion side reaction on the surface of the zinc sheet leads to an increase in pH of the electrolyte and fluctuations in specific capacity of the cells and that the dissolution of Fe 2+ ions and the lamination of LiFePO 4 particles result in a decrease in the specific capacity of the cells. At pH 5.0, the initial discharge specific capacity of the Zn/LiFePO 4 cell is about 120.0 mAh g -1 at 0.25 C, about 64.4 mAh g -1 at 3 C, about 60.9% capacity retention rate after 200 cycles at 1 C, and the Li + ions diffusion coefficient is about 7.75 × 10 -12 cm 2 s -1 .