Microscale Core-Shell Structured Li[(Ni[sub 0.8]Co[sub 0.1]Mn[sub 0.1])[sub 0.8](Ni[sub 0.5]Mn[sub 0.5])[sub 0.2]]O[sub 2] as Positive Electrode Material for Lithium Batteries

Abstract

A new concept of synergetic effects was developed with the synthesis of a spherical core-shell structure to effect a higher capacity from the LiNi 0.8 Co 0.1 Mn 0.1 O 2 core and improved thermal stability from the Li[Ni 0.5 Mn 0.5 ]O 2 shell. We now report the microscale spherical core-shell structure with LiNi 0.8 Co 0.1 Mn 0.1 O 2 as the core and a Li[Ni 0.5 Mn 0.5 ]O 2 as the shell. With these core-shell particles, a high capacity was delivered from the LiNi 0.8 Co 0.1 Mn 0.1 O 2 core and a high thermal stability was achieved by the Li[Ni 0.5 Mn 0.5 ]O 2 shell. The core-shell structured Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 0.8 (Ni 0.5 Mn 0.5 ) 0.2 ]O 2 -carbon cell showed superior cyclability and thermal stability relative to the Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 alone at a 1 C rate for 600 cycles. As a new positive electrode material, the core-shell structure of Li[(Ni 0.8 Co 0.1 Mn 0.1 ) 0.8 (Ni 0.5 Mn 0.5 ) 0.2 ]O 2 provides a significant breakthrough for the development of lithium batteries with high capacity, excellent cyclability, and high thermal stability.