Mixed lithium silicates

Details Mixed lithium silicates Mixed lithium silicates

C - Chemistry, Metallurgy

01

B

C01B 33/32 (2006.01)

Patent

CA 2677711

The invention relates to mixed lithium silicates, wherein the mixed silicates have the following formula Li2MII I(1 x)MIII xSiO4(OH)x (I) in which 0<= x<= 1 and M is Fe, Co, Mn or Ni. They are characterised in that they are in the form of essentially spherical non-coalesced particles having a size of between 400 and 600 nm, and in that they include a structure in the space group Pna21 and optionally in the space group Pccn. The silicates are obtained by precipitation in an aqueous medium from precursors. They can be used as an active material for electrodes in electrochemical devices.

L'invention concerne des silicates mixtes de lithium. Les silicates mixtes ont la formule Li2MII (1 x)MIII xSiO4(OH)x (I) dans laquelle 0<= x<= 1 et M est Fe, Co, Mn ou Ni. Ils sont caractérisés en ce qu'ils sont sous forme de particules substantiellement sphériques et non coalescées, ayant une dimension de 400 à 600 nm et qu'ils ont une structure dans le groupe d'espace Pna21 et éventuellement dans le groupe d'espace Pccn. Les silicates sont obtenus par précipitation en milieu aqueux ô partir de précurseurs. Utilisation comme matière active d'électrode pour des dispositifs électrochimiques.

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