Microstructures and electrochemical performances of TiO2-coated Mg-Zr co-doped NCM as a cathode material for lithium-ion batteries with high power and long circular life

To enhance the electrochemical properties of LiNi1/3Co1/3Mn1/3O2 (NCM) materials for lithium-ion batteries (LIBs), TiO2-coated Mg-Zr co-doped NCM cathode materials (MZT-NCM) were fabricated via a two-step solid-state method using Mg(OH)(2), Zr(OH)(4) and Ti(OH)(3) as Mg, Zr and Ti sources, respectively. The electrochemical characteristics were assessed by the hybrid pulse power characteristic (HPPC) test, galvanostatic charge-discharge, EIS and CV test. Compared with NCM, the electrochemical properties of MZT-NCM as a cathode material in a pouch-cell were enhanced, especially high power performance and the stability of long cycle life. The MZT-NCM exhibits an excellent power performance of 2051 W, compared to that of the NCM, which only achieves 1736 W at 50% state of charge (SOC). Furthermore, the MZT-NCM samples deliver an outstanding capacity retention rate of 91.10% after 7000 cycles at 3C, which is nearly 10% higher than that of NCM. The modification strategy has a positive effect on the electrochemical characteristics of NCM cathode materials, which is expected to provide meaningful guidance for developing high power and long cycle life LIBs.