حديثه محبوبي

Optimizing energy storage equipment, including batteries, is the key to reducing environmental problems and energy crises. Among the various types of commercially available batteries, lithium-ion batteries have a great opportunity due to the availability and non-toxicity of lithium as well as the observance of environmental principles. Nowadays, The most popular anode material used in lithium-ion batteries is graphite, which does not meet the needs of today's battery industry due to its low theoretical capacity and high probability of dendrite forming, resulting in short circuits and the risk of flare-ups. In the present study, NiCo2O4, a spinel structured material, was synthesized using the solution combustion method, and its performance as the anode of a lithium-ion battery was investigated. X-ray diffraction, BET, and scanning electron microscopy tests were used to eva‎luate the synthesized samples. The anodic performance of the samples was studied by cyclability, rateability, electrochemical impedance spectra, and cyclic voltammetry. In order to find the optimal parameters of synthesis, the effect of fuel type was investigated using five different fuels (urea, glycine, L-lysine, citric acid, and CTAB). Eventually, after pointing out the optimal sample, microstructural changes, and electrochemical characteristics of its full cell were observed after different cycles and a mechanism for its capacity trend was proposed. The results of this research show that altering the type of fuel cause significant structural and microstructural differences. In addition, except for the samples synthesized using glycine fuel, the capacity of all samples after a gradual decline, reached below the capacity of the commercial anode, namely graphite with a capacity of 372mAhg-1, after one hundred cycles. The best cyclability belongs to one of the samples synthesized with using glycine, which its capacity reached 666mAhg-1 after one hundred cycles. Moreover, at a high current density of 400mAg-1, this sample showed an acceptable capacity of 404mAhg-1 to be superior to the commercial graphite anode even at this current density.

باتري ليتيوم-يوني , سنتز احتراق محلولي , مواد آندي , كبالتيت نيكل , عملكرد چرخه‌اي , بازيابي ظرفيت

Lithium-Ion Battery , Solution Combustion Synthesis , Nickel Cobaltite , Cyclic Performance , Capacity Recovery

Hadiseh Mahboubi

Somaye Alamolhoda, Seyed Morteza Masoudpanah