ScholarWorks@성균관대학교

초록

Nickel has excellent oxidation resistance and high thermal stability, making it a promising candidate for use as a saggar material. Additionally, as it has a composition similar to that of nickel-cobalt-manganese (NCM), it ex hibits low reactivity with cathode active materials. Thus, this study proposes metallic nickel as a saggar material for the synthesis of NCM [Li(NixCoyMnz)O-2] cathode active materials. A long-term reaction test was conducted at 900 degrees C between a nickel crucible and an LiNi0.8Co0.1Mn0.1O2 precursor to evaluate the effectiveness of the proposed strategy. The results show that an (NiOx) reaction layer was formed on the surface of the nickel crucible due to oxygen diffusion from the cathode precursor oxide and its reaction with atmospheric oxygen. This NiO layer also contributed to an increase in surface hardness. As the heat-treatment time increased, the thickness of the reaction layer gradually increased, exceeding 156 mu m, and after 480 h, the erosion depth of the crucible was 2 similar to 3 times greater when the precursor contained Li compared to when it did not. Nevertheless, the nickel crucible maintained its shape even after continuous reaction with Li-containing NCM precursors for more than 20 d, confirming its suitability for use as a saggar in NCM synthesis.

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