ADDITIVES FOR ELECTROLYTE AND CATHODE MATERIAL IN Li-ION BATTERIES COMPRISING METAL-BASED CATHODE MATERIAL WHICH PRODUCES M2+ METAL IONS

Method of improving the performance of a Li-ion battery comprising metal-based cathode material which produces M metal ions. The method comprises using a small organic compound in association with the electrolyte of the battery or using a polymer compound in association with the cathode active material of the battery. The small organic compound and the polymer compound comprise at least one chemical group suitable for forming complexes with the M metal ions thereby preventing dissolution thereof.