Lithium iron phosphate having olivine structure and method...

C - Chemistry – Metallurgy – 01 – B

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C01B 25/30 (2006.01)

Patent

CA 2741042

Provided is an olivine-type lithium iron phosphate composed of secondary particles having a mean particle diameter (D50) of 5 to 100 µm, formed by aggregation of primary particles having a mean particle diameter (D50) of 50 to 550 nm, wherein the primary and secondary particles have a composition represented by Formula I below and the secondary particles have a porosity of 15 to 40%: Li1+a Fe1-x M x(PO4- b)X b (I) wherein M, X, a, x and b are as defined above. The olivine-type lithium iron phosphate is in the form of secondary particles, thus imparting a high bulk density to lithium secondary batteries and exhibiting superior process efficiency due to shortened mixing time, when used to fabricate the lithium secondary batteries. Furthermore, the olivine-type lithium iron phosphate has the high porosity, thus allowing at least a portion of the secondary particles to be deformed and converted into primary particles in the process of pressing to fabricate electrodes and preventing deterioration in ionic conductivity due to the large particle diameter.

L'invention concerne un phosphate de fer lithié ayant une structure cristalline de type olivine et, plus particulièrement, un phosphate de fer lithié de type olivine qui est constitué de particules secondaires ayant un diamètre moyen (D50) de 5 à 100 µm. Les particules primaires ayant un diamètre moyen (D50) de 50 à 550 nm sont agglomérées. Les particules primaires et les particules secondaires ont des compositions de formule chimique Li1+a Fe1-x Mx(PO4-b) Xb (1), dans laquelle M, X, a, x et b sont tels que définis dans les spécifications, et les particules secondaires ont une porosité de 15 à 40%. Le phosphate de fer lithié selon l'invention a la forme de particules secondaires et peut ainsi être utilisé pour réaliser une électrode pour une batterie rechargeable au lithium ayant une densité volumique élevée. Le phosphate de fer lithié selon l'invention raccourcit le temps de mélange pour améliorer l'efficacité du processus. En outre, le phosphate de fer lithié selon l'invention a une porosité élevée et donc au moins une partie des particules secondaires se transforment en particules primaires pendant l'étape de compression pour la fabrication d'une électrode, empêchant ainsi la dégradation de la conductivité ionique due à une taille élevée des particules.

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