Li 2.0 Ni 0.67 N: a promising negative electrode material for Li-ion batteries with a soft structural response

Abstract : The layered lithium nitridonickelate Li2.0(1)Ni0.67(2)N have been investigated as negative electrode in the 0.02-1.25 V vs. Li + /Li potential window. Its structural and electrochemical properties are reported. Operando XRD experiments upon three successive cycles clearly demonstrate a single phase behavior in line with the discharge-charge profiles. The reversible breathing of the hexagonal structure, implying a supercell, is fully explained. The Ni 2+ /Ni + redox couple is involved and the electron transfer is combined with the reversible accommodation of Li + ions in the cationic vacancies. The structural response is fully reversible and minimal, with a maximal volume variation of 2%. As a consequence, a high capacity of 200 mAh g-1 at C/10 is obtained with an excellent capacity retention, close to 100% even after 100 cycles, which makes Li2.0(1)Ni0.67(2)N a promising negative electrode material for Li-ion batteries.
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Thomas Cavoué, Nicolas Emery, Nurzhan Umirov, Stéphane Bach, Pascal Berger, et al.. Li 2.0 Ni 0.67 N: a promising negative electrode material for Li-ion batteries with a soft structural response. Inorganic Chemistry, American Chemical Society, 2017, 56, pp.13815-13821. ⟨http://pubs.acs.org/doi/10.1021/acs.inorgchem.7b01903⟩. ⟨10.1021/acs.inorgchem.7b01903⟩. ⟨cea-01626781⟩

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