Core/Double-Shell Type Gradient Ni-Rich LiNi0.76Co0.10Mn0.14O2 with High Capacity and Long Cycle Life for Lithium-Ion Batteries

A concentration-gradient Ni-rich LiNi0.76Co0.1Mn0.14O2 layered oxide cathode has been developed by firing a core/double-shell [Ni0.9Co0.1](0.4)[Ni0.7Co0.1Mn0.2](0.5)Ni0.5Co0.1Mn0.4](0.1) (OH)(2) hydroxide precursor with LiOH center dot H2O, where the -o.s o.i- Ni-rich interior (core) delivers high capacity and the Mn-rich exterior (shells) provides a protection layer to improve the cyclability-and-thermal stability for the Ni-rich oxide cathodes. The content of nickel and manganese, respectively, decreases and increases graclUally from the center to the surface of each gradient sample particle, offering a high capacity with enhanced surface/ structural stability and cyclability. The obtained concentration-gradient oxide cathode exhibits high-energy density with long cycle life in both half and full cells. With high-loading electrode half cells, the concentration-gradient sample delivers 3.3 mA h cm(-2) with 99% retention after 100 cycles. The material morphology, phase, and gradient structure are also maintained after cycling. The pouch-type full cells fabricated with a. graphite anode delivers high capacity with 89% capacity retention after SOO cycles at C/3 rate.