| 摘要 |
<p>The invention concerns the manufacture and use of phosphates of transition metals as positive electrodes for secondary lithium batteries and discloses a process for the production of LiMPO4 with controlled size and morphology, M being FexCoyNizMnw, with O ≤ x ≤ l, 0 ≤ y ≤ 1, O ≤ w ≤ l and x + y + z + w = l. A process is disclosed for the manufacture of LiFePO4, comprising the steps of - providing an equimolar aqueous solution of Li?1+ , Fe3+¿ and PO¿4?3-, - evaporating the water from the solution, thereby producing a solid mixture, - decomposing the solid mixture at a temperature below 500 °C to form a pure homogeneous Li and Fe phosphate precursor, and - annealing the precursor at a temperature of less than 800 °C in a reducing atmosphere, thereby forming a LiFePO¿4? powder. The obtained powders have a particle size of less than 1 νm, and provide superior electrochemical performances once mixed for an appropriate time with electrical conductive powder.</p> |
