Lithium-Rich Li_1.17Ni_0.17Co_0.17Mn_0.5O₂ Cathode Material for Lithium-Ion Cells: Effect of Calcination Temperature on Electrochemical Performance

Abstract

High-capacity lithium-rich cathode materials become promising candidates for lithium-ion cells. The crystallinity and structural stability of the cathode materials affect their electrochemical properties. Using a simple carbonate co-precipitation method, we report better electrochemical performance for Li1.17Ni0.17Co0.17Mn0.5O2 (NCMO) cathode material. Herein, we identified 950 °C as the optimum calcination temperature for the NCMO cathode material. The X-ray diffraction and SEM analyses revealed that the material synthesized at a high temperature possesses a well-crystallized layered structure. Electrochemical studies revealed that the cathode material synthesized at 950 °C (NCMO-950) delivered the highest discharge capacity of 240.9 mAhg–1 at C/10 rate. The NCMO-950 material maintained a Coulombic efficiency of ∼100% and capacity retention of 97.9% at the end of 100 cycles at C/10 rate, and the material also exhibited excellent rate performance (delivered a capacity of 142.6 mAhg–1 at 5C). Thus, it can be concluded that calcination temperature significantly impacts the structural stability and electrochemical performance of NCMO.

A comparative study of aqueous- and non-aqueous-processed Li-rich Li1.5Ni0.25Mn0.75O2.5 cathodes for advanced lithium-ion cells

“…Thus, the initial discharge capacity is significantly less than the initial charge capacity, leading to a large irreversible capacity loss and a low coulombic efficiency in the first cycle. 33–35 Fig. 5a revealed that the initial charge–discharge profiles of LNMO electrodes based on both binders are similar.…”

Opportunities and Challenges of Layered Lithium-Rich Manganese-Based Cathode Materials for High Energy Density Lithium-Ion Batteries

“…The modification methods of lithium-rich manganese cathode materials mainly include precipitation method, , solid phase method, sol–gel method, and hydrothermal method. , With the continuous improvement of the modification technology, new coating technologies have gradually matured. These include ALD (atomic layer deposition) and MLD (molecular layer deposition).…”