Open-Channel [011] Facet CeO₂ with a Shorter Pathway of Li⁺ Migration as a Modification Material for LiNi_0.8Co_0.1Mn_0.1O₂ toward High-Rate Lithium-Ion Batteries

Abstract

A stable interface is vital for the long cycling stability of nickel-rich material LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811). As such, the common remedy to improve the stability of nickel-rich layered oxide is to adopt a coating strategy. However, most of the coating materials used in this strategy are often randomly oriented, which may pose challenges toward efficient Li + transportation from the electrolyte to the core material and vice versa. In this work, we demonstrate with the use of a CeO 2 shell with [011] exposed facets as a well-oriented coating material with a shorter straight Li + migration pathway and higher electronic conductivity to further improve the stability and rate performance of the nickel-rich layered oxide. As a result, our CeO 2 [011]-modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 (1.0%-NCM811) showed improved electrochemical performance, especially in terms of rate capability. Cycling stability was also enhanced for tests conducted at room temperature and at an elevated temperature of 55 °C. The higher rate performance by our 1.0%-NCM811 may stem from the open shorter channels available in the [011] facet and the higher electrical conductivity. Based on this work, the orientation of the coating material is crucial as it could affect the rate capability of the core material drastically.

Synergistic Strategy Using Doping and Polymeric Coating Enables High-Performance High-Nickel Layered Cathodes for Lithium-Ion Batteries

“…Furthermore, the requirement of high loading of an electrode with high-performance electrochemical is one of the keys to the breakthroughs of LIBs. − We have increased the mass loading of the electrode from 3 to 13 mg cm –2 and investigated its electrochemical performance (Figure ). The initial charge–discharge results are depicted in Figure a,c.…”

Study on the effect of ceria-coated LiNi0.8Co0.1Mn0.1O2 on its electrochemical performance

“…Among them, the positive electrode material of lithium-ion batteries has a decisive factor in their electrochemical performance. Now, the lithium-ion power battery cathode materials are mainly lithium iron phosphate (LiFePO 4 ) and ternary materials (NCM/NCA), and LiFePO 4 materials cannot meet the requirement of 400 W h/kg due to their capacity limitations; Among the ternary materials, the high-nickel layered oxide cathode material NCM811 has attracted extensive attention from researchers because of its high platform potential, good rate performance, and low cost [4][5][6][7] . However, there are still some problems with this material: (1) When the Ni 2+ content increases, Li + /Ni 2+ mixes.…”

Simple Synchronous Dual-Modification Strategy with Zr4+ Doping and CeO2 Nanowelding to Stabilize Layered Ni-Rich Cathode Materials

“…Unfortunately, the present dual-modification strategies have the common problem of complicated multistep reaction routes in the experimental synthesis process . Among the doping elements, a Zr ion is considered as one effective dopant ameliorating the structural stability of layered materials because of the similar ionic radii of Zr 4+ (0.72 Å) and Li + (0.76 Å), the decreased cation mixing, and the balanced electrostatic repulsion by introducing high-valence Zr 4+ . , CeO 2 , which has a simple cubic fluorite structure with large interstitial spaces and exhibits high chemical stability, excellent Li + conductivity, and thermostability, has been identified as a promising surface protective material for layered oxide cathodes. − …”