چكيده به لاتين
Lithium ion batteries are one of the most important and popular batteries on the market and due to their rechargeability, Charging speed, high energy density, low charge self-discharge, low weight and relatively long service life on a daily basis They are added. In a separator battery, it is usually a porous membrane that is dry and wet in two ways It is made and allows ionic current to flow between the two electrodes of the anode and the cathode (while flowing from physical contact Prevents between them. In separators having characteristics such as: permeability, porosity, pore size, adsorption Electrolyte and its preservation, thermal and mechanical chemical stability is very important. In this research using the method By adding 50% dioctyl phthalate oil (to a mixture of polyethylene and silica, and extracting them with ethanol solvent) Approximately 35% porosity was reached. On the other hand, due to the fact that the oil reduces the tensile strength and prevents
Proper reduction of film deterioration, in the stretching process, thermoplastic elastomer was used instead of oil and It was observed that in the process of stretching to a film with an approximate thickness of 50 microns and a higher porosity, about 50% can be achieved. Polyolefin separators, despite their positive properties, but because of their surface Hydrophobic is a separator with low electrolyte, which leads to less electrolyte adsorption and thus less conductivity. To solve this problem, modifications such as: surface coating, bonding, irradiation and mixing are ionized.
Is used. In this study, using the mixing method, by adding silica nanoparticles to separators. It has been observed that compared to conventional polyethylene separators, the electrolyte adsorption capacity is increased and More thermal stability was also observed. Also, the amount of ionic conductivity of the samples was compared and observed The use of nanoparticles and TPE has increased ionic conductivity.
