NOVELTY - The method comprises introducing a binder including polyvinylidene difluoride to a lithium based compound and mixing them, where the binder ranges 10% of the cathode and is used in the downstream preparation of the cathode disposed in the battery, heating the lithium-based compound and the binder to 180 degrees C for an hour, adding a Lewis acid to the lithium-based compound and the binder, and spray coating the lithium-based compound with the binder. The Lewis acid has a molecular weight of less than about 200 grams per molar compound.    USE - The method is useful for improving the environmental stability of cathode material for lithium-based battery cathodes during material handling, transportation, storage, electrode fabrication and cell fabrication, where the battery is useful in electronic apparatus such as portable computers, cell phones, music players, cameras, power tools, personal digital assistants and electric vehicles.    ADVANTAGE - The method is capable of improving the environmental sensitivity including undesirable weight gain of cathode materials without a significant addition in production cost, without a decrease in material performance and without introducing contaminants whose impact on long term performance of the batteries is unknown.    DETAILED DESCRIPTION - The method comprises introducing a binder including polyvinylidene difluoride to a lithium based compound and mixing them, where the binder ranges 10% of the cathode and is used in the downstream preparation of the cathode disposed in the battery, heating the lithium-based compound and the binder to 180 degrees C for an hour, adding a Lewis acid to the lithium-based compound and the binder, and spray coating the lithium-based compound with the binder. The Lewis acid has a molecular weight of less than about 200 grams per molar compound. The method includes wet coating by introducing the lithium-based compound into a solution of the pre-dissolved binder and a solvent, and then drying the solvent.