Lithium manganese phosphate positive material for lithium secondary battery
AssigneeDow Global Technologies LLC
InventorsIvan Exnar, Thierry Drezen, Nam Hee Kwon-Roth, Motoshi Isono
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Abstract
A process for the production of nano-structured olivine lithium manganese phosphate (LiMnPO4) electrode material comprising of the following steps: sol gel preparation in a chelating environment; preparation of lithium manganese phosphate/carbon composite by ball-milling; and electrode preparation.
Claims20
A process for the production of electro-active nanostructured olivine lithium manganese phosphate in the form of particles including the steps of mixing and gel formation, drying and calcination characterized in that the mixing of precursors is done in this order manganese (II) acetate tetrahydrate, lithium acetate dihydrate and ammonium dihydrogen phosphate.
A process for the production of electro-active nanostructured olivine lithium manganese phosphate in the form of particles including the steps of mixing and gel formation, drying and calcination, wherein a chelating agent is added during the mixing step and the chelating agent used is an organic acid having a pKa value in the range of from about 1.0 to about 5.0 selected from the group consisting of acetic acid, ascorbic acid, benzoic acid, citric acid, lactic acid, malic acid, malonic, acid, oxalic acid, salicylic acid, glycolic acid, tartaric acid and mixtures thereof.
Dependencies are inferred from the claim text.