Invited Presentation: Progress in Redox Composite Cathode for Lithium Rechargeable Batteries

Only a small number of Li-containing cathode material groups have been considered for practical use in Li-ion battery systems. The constraints for cathode material design such as open anion framework and Li-containing conditions restrict the choices of materials for this use. Thus, until now, candidates of positive electrode were limited to crystals that contain both redox-active element (usually transition-metal) and lithium ion in the open framework with few exceptions. To expand the sight for seeking new positive electrode material, we recently suggested a novel strategy to use Li-free transition metal ionic compounds (MX, M = transition metal, X = anion or polyanion group) as a positive electrode material by blending with a simple Li ionic compound (LiY, Y = anion or polyanion group) in nanoscale for Li-ion batteries [1]. In this nanocomposite electrode, MX provided a redox couple for an electrochemical reaction, while Li ions were supplied from LiY.

In this talk, we present our recent progress in this concept of new electrode design.

Reference

[1] Energy Storage in Composites of a Redox Couple Host and a Lithium Ion Host, Kim et. al,  Nano Today, Vol 7, pp. 168-173 (2012)