Studies on Spinel-Layer Composite Cathode for Lithium-Ion Battery

Abstract

The development of rechargeable lithium-ion batteries with higher energy density is of technological importance for applications. In this context, the use of active spinel cathode LiMn2O4 materials has attracted attention due to its robust stable structure and layer cathode LiMn0.50Ni0.25Co0.25O2 materials known due to high capacity at moderate rates during intercalation of the lithium ions. We report studies on compound of xLiMn2O4 - (1-x) LiMn0.50Ni0.25Co0.25O2 composite cathode, where (x =0.1, 0.2, 0.3 and 0.4) for high energy density and high-capacity retention for hybrid applications. Sol-gel route has been employed for synthesis of the layer and spinel compound for cathode composite and Intimate mixing of two compound materials was achieved by a ball milling for a cathode paste. The key challenges and corresponding strategies for these materials will be discussed, with an emphasis placed on the intrinsic structural properties and energy storage electrochemistry with respect to the redox reactions. The gravimetric energy density of our composite cathode materials will carry out in comparison with the LiMn2O4 and LiMn0.50Ni0.25Co0.25O2 electrodes used in lithium-ion batteries and provide a new alternative material for applications where weight, rather than volume is a critical factor. Preliminary data of electrochemical studies revealed high capacity and cycle retentions of composites.