Single-Crystalline LiFePO4Nanosheets forHigh-Rate Li-Ion Batteries.

The lithiation/delithiation in LiFePO4is highly anisotropicwith lithium-ion diffusion being mainly confined to channels alongthe b-axis. Controlling the orientation of LiFePO4crystals therefore plays an important role for efficientmass transport within this material. We report here the preparationof single crystalline LiFePO4nanosheets with a large percentageof highly oriented {010} facets, which provide the highest pore densityfor lithium-ion insertion/extraction. The LiFePO4nanosheetsshow a high specific capacity at low charge/discharge rates and retainsignificant capacities at high C-rates, which may benefit the developmentof lithium batteries with both favorable energy and power density. [ABSTRACT FROM AUTHOR]