Design of Nickel-Based Cation-Disordered Rock-Salt Oxides: The Effect of Transition Metal (M = V, Ti, Zr) Substitution in LiNi 0.5 M 0.5 O 2 Binary Systems.

Autor: Cambaz MA; Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany., Vinayan BP; Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany., Euchner H; Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Institute of Theoretical Chemistry , Ulm University , 89069 Ulm , Germany., Johnsen RE; Department of Energy Conversion and Storage , Technical University of Denmark , Frederiksborgvej 399 , 4000 Roskilde , Denmark., Guda AA; International Research Center 'Smart Materials' , Southern Federal University , Sladkova 178/24 , 344090 Rostov-on-Don , Russia., Mazilkin A; Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany., Rusalev YV; International Research Center 'Smart Materials' , Southern Federal University , Sladkova 178/24 , 344090 Rostov-on-Don , Russia., Trigub AL; National Research Centre 'Kurchatov Institute' , 1 Akademika Kurchatova pl. , 123098 Moscow , Russia.; Institute of Geology of Ore Deposits (IGEM RAS) , 35, Staromonetnyi per. , 119017 Moscow , Russia., Gross A; Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Institute of Theoretical Chemistry , Ulm University , 89069 Ulm , Germany., Fichtner M; Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU) , Helmholtzstrasse 11 , 89081 Ulm , Germany.; Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT) , P.O. Box 3640, 76021 Karlsruhe , Germany.
Jazyk: angličtina
Zdroj: ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2018 Jul 05; Vol. 10 (26), pp. 21957-21964. Date of Electronic Publication: 2018 Jun 20.
DOI: 10.1021/acsami.8b02266
Abstrakt: Cation-disordered oxides have been ignored as positive electrode material for a long time due to structurally limited lithium insertion/extraction capabilities. In this work, a case study is carried out on nickel-based cation-disordered Fm3 ̅m LiNi 0.5 M 0.5 O 2 positive electrode materials. The present investigation targets tailoring the electrochemical properties for nickel-based cation-disordered rock-salt by electronic considerations. The compositional space for binary LiM +3 O 2 with metals active for +3/+4 redox couples is extended to ternary oxides with LiA 0.5 B 0.5 O 2 with A = Ni 2+ and B = Ti 4+ , Zr 4+ , and V +4 to assess the impact of the different transition metals in the isostructural oxides. The direct synthesis of various new unknown ternary nickel-based Fm3̅ m cation-disordered rock-salt positive electrode materials is presented with a particular focus on the LiNi 0.5 V 0.5 O 2 system. This positive electrode material for Li-ion batteries displays an average voltage of ∼2.55 V and a high discharge capacity of 264 mAhg -1 corresponding to 0.94 Li. For appropriate cutoff voltages, a long cycle life is achieved. The charge compensation mechanism is probed by XANES, confirming the reversible oxidation and reduction of V 4+ /V 5+ . The enhancement in the electrochemical performances within the presented compounds stresses the importance of mixed cation-disordered transition metal oxides with different electronic configuration.
Databáze: MEDLINE
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