Manganese oxide-based material

C - Chemistry – Metallurgy – 01 – G

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C01G 45/00 (2006.01) H01M 4/48 (2006.01) H01M 4/50 (2006.01)

Patent

CA 2343413

An oxide LiMnO2 which has a layered monoclinic structure, and in which a minor part of the manganese may be replaced by another transition metal, is made by a two-stage process. Firstly NaXO2 with a layered structure of the .alpha.- NaFeO2-type is made by reacting stoichiometric amounts of a sodium salt and a salt of the metal X in solution so as to form a precipitate, drying and heat treating the precipitate at a temperature between 650 and 720~C in air, and then rapidly cooling the precipitate to room temperature in air. Then the NaXO2 is subjected to ion exchange with a lithium salt in solution in a non- alcoholic solvent at a temperature between about 140 and 210~C. The resulting lithium manganese oxide can be used as the cathode material in a rechargeable lithium cell.

L'invention concerne la fabrication, par un procédé en deux étapes, d'un oxyde, LiMnO¿2?, ayant une structure stratifiée monoclinique, une petite partie du manganèse pouvant être remplacée par un autre métal de transition. Premièrement, on prépare du NaXO¿2? de structure stratifiée du type .alpha.-NaFeO¿2? en faisant réagir des quantités stoechiométriques d'un sel de sodium ou d'un sel du métal X en solution de manière à former un précipité; on sèche ce précipité et on le soumet à un traitement thermique à une température comprise entre 650 et 720 ·C dans de l'air; et on refroidit rapidement le précipité à température ambiante dans l'air. Ensuite, on soumet le NaXO¿2? à un échange d'ions avec un sel de lithium en solution dans un solvant non alcoolique, à une température comprise entre 140 et 210 ·C. L'oxyde de lithium et de manganèse obtenu peut être utilisé comme matériau de cathode dans une pile au lithium rechargeable.

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