Energy density, rate capability, lithium ion battery, ion exchange, solid state reaction, electrode material, transition metal ion
Reducing charge/ discharge time in high capacity rechargeable lithium ion batteries
Synthesis of LiNi0.5Mn0.5O2 without significant mixing of Li and transition metal ions
This invention is a method to synthesize LiNi0.5Mn0.5O2 with little Li/TM disorder, thereby imparting improved rate capability to the material. The new processing route is based on low-temperature ion-exchange of a well layered NaNi0.5Mn0.5O2 precursor. Compared to LiNi0.5Mn0.5O2 synthesized from the conventional solid state reaction, ion-exchanged LiNi0.5Mn0.5O2 has very little transition metal in the lithium layer, ensuring faster lithium diffusion. Due to more stable lithium site energy in the lithium-vacancy ordered system, higher operating voltage can be achieved in the ion-exchanged LiNi0.5Mn0.5O2, leading to higher energy density.
Higher energy density achieved using lower cost materials.
U.S. Patent Application Number 11/992782, filed on June 25, 2010
Last revised: April 29, 2013
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