Lithium iron phosphate having olivine structure and method...

C - Chemistry – Metallurgy – 01 – B

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C01B 25/30 (2006.01)

Patent

CA 2741080

Provided is an olivine-type lithium iron phosphate having a composition represented by Formula I, comprising 0.1 to 5% by weight of Li3PO4, and comprising no Li2CO3 or, if present, comprising Li2CO3 in an amount less than 0.25% by weight: Li1+q Fe1-x M x(PO4-h)X h (I) wherein M, X, a, x and b are as defined above. The lithium iron phosphate comprises no lithium carbonate (Li2CO3) or, if present. comprises the Li2CO3 in an extremely small amount, and comprises Li3PO4 having superior electrochemical stability, thermal stability and ionic conductivity, thus advantageously imparting high-temperature and storage stability as well as stability and rate properties to lithium secondary batteries, when used as a cathode active material for the lithium secondary batteries.

La présente invention concerne un phosphate de fer-lithium de structure cristalline olivine et, en particulier, un phosphate fer-lithium de structure olivine ayant pour composition la formule chimique (1) Li1+a Fe1-x Mx(PO4-b) Xb (dans laquelle M, X, a, x, et b sont tels que définis dans la spécification), et contenant 0,1~5 % en poids de Li3PO4, et aucun ou moins de 0,25 % en poids de Li2CO3. Le phosphate de fer-lithium selon la présente invention est dépourvu de carbonate de lithium ou contient une quantité extrêmement faible de carbonate de lithium, et contient du Li3PO4 qui est électrochimiquement très stable et excellent en termes de sécurité thermique et de conductivité ionique. Le phosphate de fer-lithium selon la présente invention, offre ainsi une stabilité supérieure dans des conditions de haute température et de stockage, et une sécurité améliorée et une capacité de régime lorsqu'il est utilisé comme matériau actif d'électrode positive pour une batterie secondaire au lithium.

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