Synthesis and characterization of Nd doped LiMnb>2b>Ob>4b> cathode for Li-ion rechargeable batteries

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• 作者：Rahul Singhal ; Suprem R. Das ; Maharaj S. Tomar ; Osbert Ovideo ; Sant ; er Nieto ; Ricardo E. Melgarejo ; Ram S. Katiyar
• 关键词：Li-ion battery ; LiMnb>2b>Ob>4b> ; Cyclic voltammetry ; Spinel cathode ; Discharge capacity
• 刊名：Journal of Power Sources
• 出版年：2007
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：10 February 2007
• 卷：164
• 期：2
• 页码：857-861
• 文件大小：466 K

摘要

Spinel powders of LiMnb>1.99b>Ndb>0.01b>Ob>4b> have been synthesized by chemical synthesis route to prepare cathodes for Li-ion coin cells. The structural and electrochemical properties of these cathodes were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, cyclic voltammetry, and charge-discharge studies. The cyclic voltammetry of the cathodes revealed the reversible nature of Li-ion intercalation and deintercalation in the electrochemical cell. The charge-discharge characteristics for LiMnb>1.99b>Ndb>0.01b>Ob>4b> cathode materials were obtained in 3.4–4.3 V voltage range and the initial discharge capacity of this material were found to be about 149 mAh gp>−1p>. The coin cells were tested for up to 25 charge-discharge cycles. The results show that by doping with small concentration of rare-earth element Nd, the capacity fading is considerably reduced as compared to the pure LiMnb>2b>Ob>4b> cathodes, making it suitable for Li-ion battery applications.