Highly ordered Li(Ni0.6Ti0.2Co0.2)O2 (NTC622) cathode material made by all-dry synthesis

IF 3 4区材料科学 Q3 CHEMISTRY, PHYSICAL Solid State Ionics Pub Date : 2025-02-11 DOI:10.1016/j.ssi.2025.116806

Macgregor F. Macintosh , P. Popli , Andrew George , M.N. Obrovac

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Abstract

Phase pure and highly ordered Li(Ni_0.6Ti_0.2Co_0.2)O₂ (NTC622) with the O3 structure was synthesized using an all-dry method from metal oxide precursors. To our knowledge, this is the first report of highly ordered NTC622. A major impediment for NTC622 synthesis was found to be the slow diffusion of Ti during sintering. This was overcome by utilizing high-energy ball milling to maximized homogeneous transition metal distribution. In addition, a pure oxygen atmosphere during the sintering step was found to minimize LiTiO₂ formation. The synthesized NTC622 exhibited a reversible capacity of 120 mAh/g, low voltage polarization, and a discharge capacity retention of 93.7 % after 100 cycles. Additionally, the NTC622 demonstrated comparable high-rate performance to NMC622. This demonstrates that layered oxides with high Ti-content are attractive cathode materials. Additionally, this study shows that all-dry methods are an effective means for composition exploration in layered oxide materials.

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来源期刊

Solid State Ionics 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.10%

发文量

152

审稿时长

58 days

期刊介绍： This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.