水解法制备Li-Co-O和Li-Mn-O混合氧化物

Reactivity of Solids Pub Date : 1989-08-01 DOI:10.1016/0168-7336(89)80042-7

C. Barriga, A. Calero, J. Morales, J.L. Tirado

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引用次数: 2

摘要

CoIII和MnIII配位化合物与3 M LiOH水解，在Li-Co-O和Li-Mn-O体系中产生不同的相。Co(NH3)63+的水解得到LiCoO2 (O3)/HCoO2的超细颗粒混合物。[OH−]/[Li+]比值越高，HCoO3含量越高。Mn(acac)3和Mn(C2O4)3−3在O2存在下水解得到正交LiMnO2和与LiMn2O4相结构相关的混合物。时效后的产物为尖晶石相，其特点是Mn氧化态小于3.5,LiMn比大于0.5。该产物的热行为包括Mn氧化到接近3.5的氧化态。

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Preparation of mixed oxides in the Li-Co-O and Li-Mn-O systems by hydrolysis reactions

The hydrolysis of Co^III and Mn^III coordination compounds with 3 M LiOH yields different phases in the Li-Co-O and Li-Mn-O systems. The hydrolysis of Co(NH₃)₆³⁺ gives mixtures of LiCoO₂ (O3)/HCoO₂ as ultrafine particles. A high [OH⁻]/[Li⁺] ratio results in a higher HCoO₃ content. The hydrolysis of Mn(acac)₃ and Mn(C₂O₄)³⁻₃ in the presence of O₂ gives a mixture of orthorhombic LiMnO₂ and a phase structurally related to LiMn₂O₄. The product after aging is the spinel phase that is characterized by an Mn oxidation state of less than 3.5 and an $Li Mn$ ratio higher than 0.5. The thermal behaviour of this product involves the oxidation of Mn to an oxidation state close to 3.5.

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Reactivity of Solids

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