چكيده به لاتين
At this moment lithium-ion battery because of having some features like low weight, high energy density, low self-discharge, environment-friendly, and safety comparison by another type of battery is considered as one of the most important energy-saving resources. In this study, synthesis the LiNi0.5Co0.2Mn0.3O2 cathode material by high energy ball milling in order to elimination or reducing the time and temperature of heat treating was investigated. For this purpose precursors were milled for 20h and 36h. XRD result showed that only with milling, the product did not produce so heating is necessary. For this purpose three group of materials, without milling, 20h milling and 36h milling at temperature range 600-850°C for 4h heat treated. XRD results showed that only 20h milling and heating at 850°C can synthesis completely. SEM result showed that particle has a homogeneous size distribution with 1.6 average sizes. The electrochemical test was done at 2.5-4.3V and discharge capacity was 134.4 mAh/g. EDS and ICP result showed the existence of Fe element in the product. ICP result showed that there is 3.20 weight percent in 20h milled sample and 3.63 weight percent in 36h milled samples. So for studying the effect of Fe on electrochemical properties, precursors milled in zirconia vial and heated at 850°C for 4h. XRD result did not show any differences with steel vial, but discharge capacity for zirconia sample was 139.4 mAh/g and indicating the worse effect of Fe on electrochemical properties.
Keywords: lithium-ion battery, ball milling, LiNi0.5Co0.2Mn0.3O2 cathode, Fe element, electrochemical properties
