Abstract In order to overcome the disadvantages of low electrical conductivity and pulverization of Co3O4 anode material, a novel Co3O4/nitrogen-doped carbon composite (Co3O4/N-C) was prepared by annealing a cobalt-based metal-organic framework (MOF) precursor. In this Co3O4/N-C composite, the Co3O4 particles are dispersed uniformly in the matrix of the nitrogen-doped carbon with an average diameter of approximately 10 nm and a mass content of 22.6%. This approach has the advantages that first, the dispersed Co3O4 nanoparticles could increase the lithium ions storage capacity and alleviate the electrode pulverization during the lithium ions insertion/extraction processes; second, the nitrogen-doped carbon material could increase the electrical conductivity of the electrode material and meanwhile serve as a buffer to relieve the structure collapse induced by the large volume change. The as-prepared Co3O4/N-C composite maintains a high reversible discharge capacity of 423 mAhg−1 after 100 cycles at the current density of 100 mAg−1, which is 129% times higher than that of the contrastive nitrogen-doped carbon material. Moreover, this strategy was verified to be effective to produce other transition metal oxides/carbon composite for improving the performance of LIBs.

中文翻译：

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以金属-有机骨架为锂离子电池负极合成Co3O4/氮掺杂碳复合材料

摘要 为了克服Co3O4负极材料电导率低、易粉化的缺点，通过对钴基金属有机骨架（MOF）前驱体进行退火制备了新型Co3O4/氮掺杂碳复合材料（Co3O4/NC）。在这种 Co3O4/NC 复合材料中，Co3O4 颗粒均匀地分散在掺氮碳的基体中，平均直径约为 10 nm，质量含量为 22.6%。这种方法的优点是：首先，分散的 Co3O4 纳米粒子可以增加锂离子的存储容量并减轻锂离子嵌入/脱嵌过程中的电极粉化；第二，掺氮碳材料可以提高电极材料的电导率，同时作为缓冲材料，缓解由大体积变化引起的结构坍塌。所制备的 Co3O4/NC 复合材料在 100 mAg-1 的电流密度下循环 100 次后仍保持 423 mAhg-1 的高可逆放电容量，这是对比氮掺杂碳材料的 129% 倍。此外，该策略被证实可有效生产其他过渡金属氧化物/碳复合材料，以提高 LIB 的性能。比对比氮掺杂碳材料高 129%。此外，该策略被证实可有效生产其他过渡金属氧化物/碳复合材料，以提高 LIB 的性能。比对比氮掺杂碳材料高 129%。此外，该策略被证实可有效生产其他过渡金属氧化物/碳复合材料，以提高 LIB 的性能。