مطالعه برخي خواص الكتروشيميايي كاتد باتري يون ليتيمي

study of electrochemical properties relating to cathode of lithium ion battery

تقاضا براي باتري هاي قابل شارژ با عملكرد الكتروشيميايي بالا، امنيت و مواد ساز گاز با محيط زيست و كم هزينه به شدت در حال افزايش است. توسعه تكنولوژي و افزايش تقاضا براي ابزار قابل حمل منجر به تحقيقات گسترده اي روي مواد كاتدي شده است، كه نقش مهمي در تعيين عملكرد الكتروشيميايي باتري دارند .در بين مواد كاتدي نوع LiMn2O4 اسپينل، LixNiyMn2-yO4 به دليل ظرفيت و ولتاژ عملكرد بالا، به عنوان يكي از بهترين مواد كاتدي براي باتري هاي يون ليتيمي درنظرگرفته شده است.

The demand for secondary batteries with high electrochemical performance, safety and low cost environmental friendly materials is rapidly increasing.Technological development and increased demand for mobile equipement has led to wide-span research on new cathode materials, which play an important role in determining battery's electrochemical performances. Among the spinel type LiMn2O4 cathodes, LixNiyMn2-yO4 has been considered as one of the most promising cathode materials for lithium ion batteries due to its high capacity and operating voltage. In this work, we employed a novel anodic electrodeposition method for the synthesis of lithium nickel manganese oxide as cathode material of lithium ion batteries. Results showed that the addition of nickel into the host manganese dioxide has a positive effect and evaluate different phenomena such as: homogenization of particle size, reducing charge transfer resistance, increasing charge/discharge capacity and extending of cycle life. The obtained optimized material LixNiyMn2-yO4 (x=0.5 and y=0.8) showed a first cycle discharge capacity in the order of 145 mAh/g. The charge transfer resistance of the latter was considerably lower in comparison with other samples