Community Research and Development Information Service - CORDIS

New process for positive active materials used in Lithium-Ion cells

State of the Art processes (practical & industrial) all relates to the high temperature (>500°C) synthesis of LiFePO4 compounds using either expensive raw materials such as Iron(II) oxalate or intermediate substances not commercially available or unstable. Moreover, for compounds requiring doping and/or substitution of Iron by another element, State of the Art processes require the preparation and use of separate raw material. Some recipes impose also the synthesis of new non available specific compounds.

ERACHEM studied several processes for this type of materials.

The proposed process is very useful for the battery community for at least three reasons:
- Uses low cost, readily available raw materials - Iron(II) sulphate, Mn(II) sulphate.

- The generic process proposed for the intermediate compound can accommodate any suitable composition or proportion of metals contrary to the State of Art methods.

- Once this highly homogeneous intermediate compound is prepared, the synthesis of the Olivine active phase (doped and or/substituted) can be done at a much lower temperature than the State of Art preparation methods (+/- 350°C).

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