A solid-state conversion process for the preparation of LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM333) using metal oleate precursors was studied. The low melting points of metal oleate complexes result in a highly homogeneous mixture of Li-, Ni-, Co-, and Mn-oleates before calcination at a high temperature in a solid-state conversion process. The discharge capacity and capacity retention were assessed using a control sample prepared with metal acetate precursors. Cyclic voltammetry and electrochemical impedance spectroscopy showed larger cathodic and anodic peak currents and a lower charge transfer resistance for the coin cell with the cathode prepared from metal oleates than for the cell with the cathode prepared from metal acetates. The superior electrochemical properties of the NCM333 cathode prepared by the solid-state conversion process suggested in this study are attributed to the formation of a perfect $$R\overline 3 m$$ R 3 ¯ m layered structure with a low degree of cation mixing.

中文翻译：

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金属油酸盐前驱体固态转化制备锂离子电池正极材料LiNi1/3Co1/3Mn1/3O2

研究了使用金属油酸盐前体制备 LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM333) 的固态转化过程。金属油酸盐配合物的低熔点导致在固态转化过程中在高温下煅烧之前，Li-、Ni-、Co-和Mn-油酸盐的高度均匀混合物。使用用金属醋酸盐前体制备的对照样品评估放电容量和容量保持率。循环伏安法和电化学阻抗谱表明，与阴极由金属乙酸盐制备的电池相比，由金属油酸盐制备的纽扣电池具有更大的阴极和阳极峰值电流以及更低的电荷转移电阻。