Crystallographic and magnetic study of a new series of polymorph Li2M(SO4)2 for Li-ion batteries.
We have recently discovered a new series of polymorphs of general formulae Li2M(SO4)2 (M = Fe, Co, Mn, Ni) which present very good potentialities as Li-ion battery materials. Indeed lithium can be extracted from Li2Fe(SO4)2 according two plateau at 3.73 and 3.85 V vs. Li+/Li0, which is much higher than the most praised iron-based material LiFePO4 (3.45 V). The two plateaus indicate the presence of a single well-defined phase Li1.5Fe(SO4)2 for which iron is in the 2.5+ state (possible charge ordering). Therefore we propose to study the nuclear and magnetic structure of these compounds with two aims: (i) determine the Li position of the pristine and delithiated materials Li1.5Fe(SO4)2 and Li1Fe(SO4)2, (ii) explore the magnetic structure of the LixM(SO4)2 phases as we expect it to reveal new physics (magnetoelectric properties, charge ordering effects at low T). Temperature-dependent magnetic susceptibility measurements show that a long-range magnetic order is established below about 30-50 K (depending on the sample). We ask for 4 days on D20 to measure the following compounds: Li2M(SO4)2 (M = Fe, Co, Mn, Ni) and the two delithiated phases Li1.5Fe(SO4)2 and Li1Fe(SO4)2.
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LANDER Laura; Thomas C. Hansen; Marine REYNAUD; RODRIGUEZ-CARVAJAL Juan; ROUSSE Gwenaelle; SUN Meiling and TARASCON Jean-Marie. (2014). Crystallographic and magnetic study of a new series of polymorph Li2M(SO4)2 for Li-ion batteries.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2328
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