Carbonated complex oxides and method for making the same

Details Carbonated complex oxides and method for making the same Carbonated complex oxides and method for making the same

H - Electricity

01

M

H01M 4/525 (2010.01) H01M 4/131 (2010.01) H01M 4/505 (2010.01) H01M 10/0561 (2010.01)

Patent

CA 2667602

The invention relates to a method for preparing a carbonated complex oxide having a very low water content, and to the use thereof as a cathode material. The carbonated complex oxide is made of particles of an olivine-structure AMXO4 compound bearing on a portion at least of their surface a carbon film deposited by pyrolysis. A is Li alone or partially replaced with at most 10 at % of Na or K. M is FeII alone or partially replaced with at most 50 at % of one or more other metals selected from Mn, Ni and Co and/or with at most 10 at % of one or more aliovalent or isovalent metals other than Mn, Ni or Co and/or with at most 5 at % of FeIII. XO4 Is PO4 alone or partially replaced with at most 10 molar % of SO4 and SiO4. the material has a water content lower than 1000 ppm.

L'invention concerne un procédé pour la préparation d'un oxyde complexe carboné ayant une très faible teneur en eau, et son utilisation comme matériau de cathode. L'oxyde complexe carboné est constitué par des particu¬ les d'un composé AMXO4 à structure olivine qui portent sur au moins une partie de leur surface un film de carbone déposé par pyrolyse. A représente Li, seul ou partiellement remplacé par au plus 10% at. de Na ou K. M représente FeII, seul ou partiellement remplacé par au plus 50% atomique d'un ou plusieurs autres métaux choisis parmi Mn, Ni et Co, et/ou par au plus 10% atomique d'un ou plusieurs métaux aliovalents ou isovalents autres que Mn, Ni ou Co, et/ou par au plus 5% atomique de FeIII. XO4 représente PO4 seul ou partiellement remplacé par au plus 10% molaire de SO4 et SiO4. Ledit matériau a une teneur en eau < 1000 ppm.

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