Ni‐Rich Layered Cathode Materials by a Mechanochemical Method for High‐Energy Lithium‐Ion Batteries

Abstract

Ni‐rich cathode materials are attractive for use in high energy density lithium‐ion batteries due to low Co, high specific capacity and low cost; however, due to the poor cycling stability of materials with high Ni content of over 80 %, their large‐scale application in electric vehicles is limited. Furthermore, for industrial applications, it is important to simplify the synthetic procedures to reduce the manufacturing cost of the cathode material. A mechanochemical method is introduced for a combination of carbonate and hydroxide starting materials with Ni content of over 80, 85, and 90 %. These precursor materials are stable in air and are easy to use for the synthesis of LiNixCoyMnzO2 materials by solid state reaction. The crystalline structures and surface morphologies of the obtained mixed precursors and LiNixCoyMnzO2 powders are characterized using X‐ray diffraction analysis and field scanning electron microscopy with energy dispersive X‐Ray spectroscopy. The electrochemical performance is evaluated by repeat charge‐discharge cycling and measurement of the rate capability for various potential ranges from 3.0 to various high cut‐off potentials of 4.2, 4.3 and 4.4 V vs. Li/Li+. The results suggest that the whole process is very simple and similar to that used in the production of commercial LiNixCoyMnzO2, with no additional equipment needed in the application of this synthesis method for industrial purposes.

Nickel‐Based Materials for Advanced Rechargeable Batteries

“…LiNi x Co y Mn z O 2 (NCM) as typical ternary LiNi x M y M' z O 2 materials have recently attracted significant attention. [163,[219][220][221] The structural and electrochemical properties of the formed layered NCM materials can be dependent on the ratio of each transition metal in the composite. [222][223][224] In recent years, NCM have been reported mainly including LiNi 0.33 Co 0.33 Mn 0.33 O 2 (NCM111), [225] LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NCM622), [226] and LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811).…”

New Insights of Infiltration Process of Argyrodite Li6PS5Cl Solid Electrolyte into Conventional Lithium-Ion Electrodes for Solid-State Batteries

“…First, the commercial poly-crystalline cathode material, i.e., NCM811 coated by LiNbO 3 , which has been previously used for all-solid-state batteries [27,36,37], was characterized via physicochemical and electrochemical methods as shown in Figure S1a (Supplementary Information). It should be noted that the obtained XRD pattern corresponds to the R-3m hexagonal structure of α-NaFeO 2 (which corresponds to the LiNiO 2 (JCPDS 74-0919) structure used for indexing the peaks), and all of the peaks are well-assigned using this structure type [38][39][40]. However, the coating material LiNbO 3 on the surface of NCM811 is not observed in the XRD patterns.…”