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000865963 1001_ $$0P:(DE-HGF)0$$aEilers-Rethwisch, Matthias$$b0
000865963 245__ $$aSynthesis, electrochemical investigation and structural analysis of doped Li[Ni0.6Mn0.2Co0.2-M]O2 (x = 0, 0.05; M = Al, Fe, Sn) cathode materials
000865963 260__ $$aNew York, NY [u.a.]$$bElsevier$$c2018
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000865963 520__ $$aLayered Ni-rich Li[Ni0.6Mn0.2Co0.2-xMx]O2 cathode materials (x = 0, 0.05; M = Al, Fe, Sn) are synthesized via a co-precipitation synthesis route and the effect of dopants on the structure and electrochemical performance is investigated. All synthesized materials show a well-defined layered structure of the hexagonal α-NaFeO2 phase investigated by X-ray diffraction (XRD). Undoped LiNi0.6Mn0.2Co0.2O2 exhibits a discharge capacity of 170 mAh g−1 in Li-metal 2032 coin-type cells. Doped materials reach lower capacities between 145 mAh g−1 for Al and 160 mAh g−1 for Sn. However, all doped materials prolong the cycle life by up to 20%. Changes of the lattice parameter before and after delithiation yield information about structural stability. A smaller repulsion of the transition metal layer during delithiation in the Sn-doped material leads to a smaller expansion of the unit cell, which results in enhanced structural stability of the material. The improved structural stability of Sn-doped NMC cathode active material is proven by thermal investigations with the help of Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA).
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000865963 7001_ $$0P:(DE-Juel1)166130$$aWinter, Martin$$b1$$eCorresponding author$$ufzj
000865963 7001_ $$00000-0002-3743-8837$$aSchappacher, Falko Mark$$b2$$eCorresponding author
000865963 773__ $$0PERI:(DE-600)1491915-1$$a10.1016/j.jpowsour.2018.02.080$$gVol. 387, p. 101 - 107$$p101 - 107$$tJournal of power sources$$v387$$x0378-7753$$y2018
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