A Novel Core-shell Structured Nickel-rich Layered Cathode Material for High-energy Lithium-ion Batteries

Abstract

For enhancing the electrochemical properties of lithium transition-metal oxide, a novel core-shell structured cathode material LiNi Co Mn O @V O was designed and synthesized. The precursor of the material was made of metal hydroxide in the interior and metal 0.75 0.12 0.13 2 2 5 carbonate in the exterior, and with full concentration gradient structure. In this cathode material, the core was the high-Ni material, and the shell was the high-Mn material. The sphere material was coated and penetrated by V O due to the existence of pores. Furthermore, the material was 2 5 also doped by vanadium element. These were investigated and confirmed by X-ray diffraction, Focused Ion beam, EDS, TEM, etc. The 3 wt% V O -coated sample exhibited a remarkable cycling performance, with capacity retention of 86.5% at the current rate of 1 C after 100 cycles.