Fundamental degradation mechanisms of layered oxide Li-ion battery cathode materials: Methodology, insights and novel approaches

• DOI: 10.1016/j.mseb.2014.11.014
• Publication Date: 2014-11-29T18:11:11Z
• Authors: R. Hausbrand; G. Cherkashinin; H. Ehrenberg; M. Gröting; K. Albe; C. Hess; W. Jaegermann
• Keywords: Overcharge; Degradation; Capacity loss

This overview addresses the atomistic aspects of degradation layered LiMO2 (M = Ni, Co, Mn) oxide Li-ion battery cathode materials, aiming to shed light on fundamental mechanisms especially inside active materials and at their interfaces. It includes recent results obtained by novel in situ/in operando diffraction methods, modelling, quasi situ surface science analysis. Degradation material occurs upon overcharge, resulting from a positive potential shift anode. Oxygen loss eventual phase transformation dead regions are ascribed changes electronic structure defect formation. The anode free lithium due side reactions occurring electrode/electrolyte Such caused electron transfer, depend energy level alignment interface. Side interfaces capacity fade may be overcome use suitable solid-state electrolytes Li-containing anodes.