Laisa, C.P and Nanda Kumar, A.K and Selva Chandrasekaran, S and Murugan, P and Lakshminarasimhan, N and Govindaraj, R and Ramesha, K (2016) A comparative study on electrochemical cycling stability of lithium rich layered cathode materials Li1.2Ni0.13M0.13Mn0.54O2 where M ¼ Feor Co. Journal of Power Sources, 324. pp. 462-474. ISSN 0378-7753

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In this work we compare electrochemical cycling stability of Fe containing Li rich phase Li1.2Ni0.13- Fe0.13Mn0.54O2 (FeeLi rich) with the well-known Co containing Li rich composition Li1.2Ni0.13- Co0.13Mn0.54O2 (CoeLi rich). During the first charge, the activation plateau corresponding to removal of Li2O from the structure is smaller (removal of 0.6 Li) in the case of FeeLi rich compared to CoeLi rich composition (0.8 Li removal). Consequently, the Fe compound shows better capacity retention; for example, after 100 cycles FeeLi rich compound exhibits 20% capacity degradation where as it is about 40% in the case of CoeLi rich phase. The electrochemical and microscopy studies support the fact that compared to CoeLi rich compound, the FeeLi rich composition display smaller voltage decay and reduced spinel conversion. XPS studies on charged/discharged FeeLi rich samples show participation of Feþ3/Feþ4 redox during electrochemical cycling which is further supported by our first principles calculations. Also the temperature dependent magnetic studies on charge-discharged samples of FeeLi rich compound point out that magnetic behavior is sensitive to cation oxidation states and Ni/Li disorder

Item Type: Article
Uncontrolled Keywords: Lithium ion battery; Layered cathode; Electrochemical cycling
Subjects: Functional Materials
Electrochemical Materials Science
Depositing User: Dr. N Meyyappan
Date Deposited: 09 Aug 2017 11:01
Last Modified: 09 Aug 2017 11:01

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