Case 11755

LiNi0.5Mn0.5O2 with significantly low cation mixing for higher energy and power density


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.

  • Professor Gerbrand Ceder(Department of Materials Science and Engineering, MIT)
  • Kisuk Kang (Department of Materials Science and Engineering, MIT)

Intellectual Property:

U.S. Patent Application Number 11/992782, filed on June 25, 2010



Last revised: April 29, 2013

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