Air Exposure Effect on LiFePO4

The impact of ambient air exposure on LiFePO 4 /C nanocomposites has been investigated. A pristine sample was prepared without any exposure to ambient air through the whole process of synthesis and characterization and compared to the exposed samples. A small amount of lithium deintercalates from the olivine structure during exposure, a majority of which can be electrochemically reintercalated. This phenomenon changes the initial surface and bulk properties and should be taken into account when diminishing the particle size of LiFePO 4 . Keeping nanocomposites away from oxidative moisture atmosphere could be a solution to minimize these side reactions.

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