Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 20: Poster session II
MM 20.29: Poster
Dienstag, 2. April 2019, 18:30–20:00, Poster C
ACuFe2(VO4)3 (A = Li,Na) as cathode material for lithium-ion batteries — •Patrick Schilling1, Yuquan Wu1, Elisa Thauer1, Alexander Vasiliev2, and Rüdiger Klingeler1 — 1Kirchhoff Institute of Physics, Heidelberg University, Germany — 2Lomonosov Moscow State University, Moscow, Russia
ACuFe2(VO4)3 (A = Li,Na) are novel mixed-spin chain materials which feasibility for application in lithium- and sodium-ion batteries bas been scarcely studied. Due to multiple transition metal ions (i.e., Cu2+, Fe3+, V5+) providing potential redox centers, both materials are promising candidates for cathode materials in batteries. We report electrochemical studies vs. Na and Li, respectively. While no significant activity in a Na-battery is found for A = Na, LiCuFe2(VO4)3 shows a clear redox pair centered at 2.5 V and several weaker features which we associate with V5+/V4+ and V4+/V3+. Galvanostatic cycling shows continuous capacity decay from 270 mAhg−1 in cycle 2 to 180 mAhg−1 in cycle 10. XRD of electrodes at various stages of charging suggests the possible reversible formation of LiFeO2 during lithium intercalation.