هادي مرادي

In this research, in order to design and manufacture high-performance lithium batteries by changing the composition of the electrolyte, organic-silicon vinyl triethoxysilane (VTES) compounds are used as new additions that are completely compatible with the environment. In this research, for the first time, a silane compound is used to improve the surface properties of the cathode electrode with the active material LiNi0.5Co0.2Mn0.3O2 in lithium-ion industrial cells. This silane compound is used at the rate of 5% volume/volume (as the optimal percentage composition) in lithium-ion cells on an industrial scale (full cells 18650) and laboratory (half cells 2032). took The use of this compound as an additive in the electrolyte generally improves the safety and thermal and electrochemical stability of the electrolyte and lithium-ion cells. In order to measure and eva‎luate the effect and performance of VTES composition, thermal and electrochemical analyzes SET, TGA/DSC, EIS, CV, LSV, FE-SEM, EDX and MAP as well as charge/discharge tests have been used. This compound has low viscosity, high thermal stability, lower density than electrolyte organic solvents, completely non-toxic and in accordance with the principles of green chemistry. The newness of this material increases the electrochemical and thermal stability of the electrolyte at room temperature, opens the electrochemical potential window and improves its other electrochemical parameters as a result of creating a stable and uniform surface film on the surface of the cathode and anode and improving the cyclability properties by reducing the percentage. Loss of capacity, increase in the percentage of capacity maintenance and decrease in the polarization of the electrode surface, Improving the parameters of electrochemical impedance and ultimately increasing the safety of industrial cells, along with being environmentally friendly and low cost of preparing this material, are all the achievements of using vinyl triethoxysilane (VTES) compound as an additive in cell electrolyte. The lithium-ion batteries in this research are a confirmation of the good choice of this material to improve the performance of these cells in the scale of industrial production

سلول¬هاي يون - ليتيومي، وينيل تري اتوكسي سيلان (VTES)، پايداري حرارتي و الكتروشيميايي

lithium-ion cells, vinyl triethoxysilane (VTES), thermal and electrochemical stability

Hadi Moradi

Seyed Mohammad Reza Milani Hosseini