Method for producing cathode active material for lithium ion...

H - Electricity – 01 – M

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H01M 4/58 (2010.01) H01M 4/36 (2006.01)

Patent

CA 2722547

A method for producing a cathode active material for lithium ion batteries includes a step of synthesizing LiFePO4 by carrying out a hydrothermal reaction using an Li salt, a Fe salt, and a phosphoric acid source as raw materials. Elements Li and Fe in the Li and Fe salts are added to the reaction system in amounts excessively larger than the theoretical amounts required for the hydrothermal reaction. The synthesized LiFePO4 has an average primary particle size of equal to or larger than 30 nm and equal to or smaller than 100 nm.

La présente invention a trait à un procédé de production d'une substance active de cathode pour une batterie au lithium-ion. Le procédé utilise un sel de Li, un sel de Fe et une source d'acide phosphorique en tant que substances premières, et comprend une étape consistant à réaliser une réaction hydrothermale en utilisant ces substances pour synthétiser LiFePO4. Dans le procédé, le sel de Li et le sel de Fe sont ajoutés au système réactionnel dans des quantités permettant à l'élément Li dans le sel de Li et à l'élément Fe dans le sel de Fe d'être en excès par rapport aux quantités théoriques requises pour la réaction hydrothermale, et le LiFePO4 synthétisé a un diamètre principal moyen des particules compris entre 30 et 100 nm inclus.

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