Micron-Sized Monodisperse Particle LiNi0.6Co0.2Mn0.2O2 Derived by Oxalate Solvothermal Process Combined with Calcination as Cathode Material for Lithium-Ion Batteries

Abstract

Ni-rich cathode LiNixCoyMn1-x-yO2 (NCM, x ≥ 0.5) materials are promising cathodes for lithium-ion batteries due to their high energy density and low cost. However, several issues, such as their complex preparation and electrochemical instability have hindered their commercial application. Herein, a simple solvothermal method combined with calcination was employed to synthesize LiNi0.6Co0.2Mn0.2O2 with micron-sized monodisperse particles, and the influence of the sintering temperature on the structures, morphologies, and electrochemical properties was investigated. The material sintered at 800 °C formed micron-sized particles with monodisperse characteristics, and a well-order layered structure. When charged–discharged in the voltage range of 2.8–4.3 V, it delivered an initial discharge capacity of 175.5 mAh g−1 with a Coulombic efficiency of 80.3% at 0.1 C, and a superior discharge capacity of 135.4 mAh g−1 with a capacity retention of 84.4% after 100 cycles at 1 C. The reliable electrochemical performance is probably attributable to the micron-sized monodisperse particles, which ensured stable crystal structure and fewer side reactions. This work is expected to provide a facile approach to preparing monodisperse particles of different scales, and improve the performance of Ni-rich NCM or other cathode materials for lithium-ion batteries.

Thermal Safety Analysis of Disordered Li-Rich Rock salt Li1.3Mn0.4Nb0.3O2 Cathode

“…However, the increase in the active surface area also leads to increased side reaction resulting in high irreversible capacity and fast capacity fade. 27 The LNMO−C exhibited a 30% capacity retention after 100 cycles. This indicates that optimum particle size is critical to improve the electrochemical performance without compromising the cycle life.…”

“…The low specific capacity can be caused by the large particle size and poor electrical conductivity. 27 The electrochemical performance of both LNMO and the LNMO−C was tested in a Li half-cell configuration with Li metal as the reference and counter electrode. Despite the high crystallinity, LNMO shows poor Li storage with a limited specific capacity of 50 mA h g −1 at a current density of 20 mA g −1 .…”

“…This indicates that optimum particle size is critical to improve the electrochemical performance without compromising the cycle life. 27 ). The increase in the oxidation peak at 3.4 V at the expense of the peak at 3.7 V implies the slow transformation of Mn species while increasing the contribution from the lower voltage process.…”

“…The low specific capacity can be caused by the large particle size and poor electrical conductivity . The electrochemical performance of both LNMO and the LNMO–C was tested in a Li half-cell configuration with Li metal as the reference and counter electrode.…”

Enhancing the Electrochemical Performance of Ni-Rich LiNi0.88Co0.09Al0.03O2 Cathodes through Tungsten-Doping for Lithium-Ion Batteries

“…Lithium-ion batteries (LIB), the popularity of which is growing rapidly, are used primarily in all kinds of electronic equipment. Currently, they are most often used in laptops, mobile phones, digital cameras, and other portable devices, as well as in electric and hybrid cars [1][2][3][4][5]. Among the commonly available LIB cathode materials, Ni-rich layered cathode materials, particularly LiNi x Co y TM 1−x−y O 2 , are believed to be the best choice of power sources for the current electric vehicles [6][7][8][9][10][11][12][13].…”