Preparation and electrochemical behavior of sol–gel LiNi<sub>0.3sub>Co<sub>0.70−xsub>M<sub>xsub>O<sub>2sub> (M = Mn, Al)

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• 作者：Aracely Hern&#xe1 ; ndez ; Silvia Fabela ; Luis Carlos Torres-Gonz&#xe1 ; lez ; Eduardo S&#xe1 ; nchez
• 关键词：Lithium– ; nickel– ; cobalt oxide ; Sol– ; gel citrate method ; XRD
• 刊名：Ceramics International
• 出版年：2008
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：January 2008
• 卷：34
• 期：1
• 页码：225-229
• 文件大小：586 K

摘要

LiNi<sub>0.3sub>Co<sub>0.70−xsub>M<sub>xsub>O<sub>2sub> (M = Mn, Al) powders were synthesized using as a precursor, an aqueous or alcoholic mixture of metal organic salts with citric acid as chelating agent. Resulting powders were characterized by thermal analysis (TGA–DTA), X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Desired crystalline structure was developed at 700 °C. LiNi<sub>0.3sub>Co<sub>0.7sub>O<sub>2sub> powders exhibit a layered α-NaFeO<sub>2sub> structure (space group: science?_ob=MathURL&_method=retrieve&_udi=B6TWH-4MBC580-1&_mathId=mml1&_user=10&_cdi=5563&_rdoc=34&_acct=C000050221&_version=1&_userid=10&md5=f50501b1581c2f8dd43557e5c134ad4c">src="http://www.sciencedirect.com/cache/MiamiImageURL/B6TWH-4MBC580-1-1/0?wchp=dGLbVzb-zSkzk" alt="Click to view the MathML source" align="absbottom" border="0" height=14 width=32>). Electrochemical characteristics of the synthesized materials were evaluated on Swagelock™ cells on a Li/LiNi<sub>0.3sub>Co<sub>0.70−xsub>M<sub>xsub>O<sub>2sub> configuration. For LiNi<sub>0.3sub>Co<sub>0.7sub>O<sub>2sub> the initial capacity was 142 ± 5 mAh/g and for LiNi<sub>0.3sub>Co<sub>0.6sub>Mn<sub>0.1sub>O<sub>2sub> similar capacity was exhibited. On the other hand, a decrease on cell capacity was observed when Co substitution was done with aluminum.