Enhanced Electrochemical Performances of Ni-rich Cathode Materials for Lithium Ion Batteries by Mixed Coating Layers

Abstract

The properties exhibited by Ni-rich cathode materials were enhanced through the mixed coating layers of Li 3 PO 4 and boric acid. The scanning electron microscopy (SEM), the transmission electron microscope (TEM), the differential scanning calorimetry (DSC), the Electrochemical Impedance Spectroscopy (EIS), as well as the half-cell and full-cell charge-discharge tests were adopted for characterizing the structure and electrochemical properties exhibited by the cathode materials. As revealed by results, the Li 3 PO 4 and boric mixed coating layers can effectively reduce the surface area and protect the direct contact between cathode material particle surface and electrolyte, meanwhile improving the structural stability and cycle performance. The coating of fast ionic conductor contributes to enhance the specific capacity possessed by the Ni-rich cathode materials accordingly.

Atomic-level insights into the first cycle irreversible capacity loss of Ni-rich layered cathodes for Li-ion batteries

“…[24][25][26][27][28][29][30][31] Additionally, anion substitution, 32 partial nickel substitution in LiNiO 2 with various elements such as Mg, Mn, Cr, Fe, Co, Al, Ga, Zr, Ti, Sb, W, Mo, and F, has been explored. [33][34][35][36][37]50,51 Concurrent coating techniques, 38,39 surface-tobulk modications, 40,41 core/shell-type structure design, 42,43 and innovative recycling methodologies 44 for Ni-rich compounds also contribute to this growing eld. These developments have reignited interest across academia and industry, as most of these observations demonstrate improved cyclic stability and rate capability.…”

“…The incorporation of these elements results in an improved structural stability of NCMs, consequently elevating the overall electrochemical behavior of the associated electrodes. Additionally, several studies on Ni rich cathodes and improving their electrochemical performance 18,32,38,46 and degradation mechanisms 22,54 have been reported.…”