Tahmasebi Mohammad H, Obrovac Mark N
Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada.
ACS Omega. 2025 Aug 22;10(35):40335-40341. doi: 10.1021/acsomega.5c05620. eCollection 2025 Sep 9.
Single-phase rock-salt (RS) Ni-Mn-Co oxides were synthesized from NiO, MnO, and CoO powder mixtures with or without sodium sulfate as molten-salt flux and subsequently used as precursors for the all-dry synthesis of LiNiMnCoO (NMC622). Pelletization and the utilization of a molten salt were both effective in improving the crystallinity and compositional inhomogeneity of RS precursors, to such a degree that RS precursors prepared with the molten-salt method required only simple hand mixing of the oxide components to achieve a similar level of compositional homogeneity as RS precursors prepared with more than an hour of intense grinding. The enhanced homogeneity of the RS precursor made with a molten-salt process also translated into enhanced homogeneity and electrochemical performance in its product NMC. These results show that utilizing a molten salt in RS-precursor synthesis can potentially reduce cost and processing steps in all-dry NMC synthesis.
单相岩盐（RS）镍锰钴氧化物由氧化镍、氧化锰和氧化钴粉末混合物合成，添加或不添加硫酸钠作为熔盐助熔剂，随后用作全干法合成LiNiMnCoO（NMC622）的前驱体。造粒和使用熔盐都有效地提高了RS前驱体的结晶度和成分不均匀性，以至于用熔盐法制备的RS前驱体只需要简单地手工混合氧化物成分，就能达到与经过一个多小时强烈研磨制备的RS前驱体相似的成分均匀性水平。熔盐法制备的RS前驱体增强的均匀性也转化为其产物NMC增强的均匀性和电化学性能。这些结果表明，在RS前驱体合成中使用熔盐有可能降低全干法NMC合成的成本和加工步骤。
