Magnesium-based additives for the cathode slurry to enable high voltage application of lithium-ion batteries. (20th February 2017)

• Record Type: Journal Article
• Authors: Wagner, Ralf; Kraft, Vadim; Streipert, Benjamin; Kasnatscheew, Johannes; Gallus, Dennis R.; Amereller, Marius; Korth, Martin; Cekic-Laskovic, Isidora; Winter, Martin
• Is Part Of: Electrochimica acta. Volume 228(2017)
• Page Start: 9
• Page End: 17
• Publication Date: 2017-02-20
• Subjects: lithium-ion batteries -- cathode slurry -- magnesium -- high voltage -- NMC cathode; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2017.01.029
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: The kinetic stabilization of the cathode/electrolyte interface is essential to enhance cycle life and safety of lithium-ion batteries at high voltage application. The addition of only 2 wt.% Mg powder to the cathode slurry were found to significantly increase the cycle life of LiNi1/3 Co1/3 Mn1/3 O2 /Li half cells upon cycling to 4.6 V vs. Li/Li +, in terms of higher capacity retention, less parasitic reactions and less self-discharge. The presence of dissolved Mg 2+ cations in the electrolyte during formation of the cell lead to an increased hydrolysis of the conducting salt LiPF6 and the formation of stable and effective LiPFx Oy /Mg(PFx Oy )2 species on the charged cathode surface.