Transition metal oxides have become a potential anode material for LIBs due to their large theoretical capacity, low cost, abundant resources. However, significant volume changes and severe particle aggregation occur during charge/discharge process. In this work, it is found that the composite of dual component active TMO and single metal, and coating by doped carbon are the effective methods to improve the electrochemical performance and adapt to volume changes in storing lithium. The specific process is based on the co-precipitation of Zn and Co ions in the presence of 2-methylimidazolium salts to produce imidazolium salt frameworks (ZIFs) of bimetallic zeolites, which are then thermally decomposed to form hollow spheres structures Co/CoO/ZnO@NC. The hollow sphere uses Co as the core and CoO/ZnO@NC particles coated with nitrogen doped carbon layer as the shell. These spherical structures exhibit excellent electrochemical performance, high reversible capacity, excellent cycling stability (702 mAh/g at 100 mAg after 100 cycles), and good rate capability (735 mAh/g and 515 mAh/g at 100 mA g and 2000 mA g respectively).

中文翻译：

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由金属有机框架形成空心球结构Co/CoO/ZnO@NC作为锂离子电池阳极

过渡金属氧化物因其理论容量大、成本低、资源丰富而成为潜在的锂离子电池负极材料。然而，在充放电过程中会发生显着的体积变化和严重的颗粒聚集。本工作发现双组分活性TMO与单一金属的复合以及掺杂碳涂层是提高电化学性能和适应储锂体积变化的有效方法。具体过程是基于 Zn 和 Co 离子在 2-甲基咪唑鎓盐存在下共沉淀生成双金属沸石咪唑鎓盐骨架 (ZIF)，然后热分解形成空心球结构 Co/CoO/ZnO @NC。该空心球以Co为核，以涂覆氮掺杂碳层的CoO/ZnO@NC颗粒为壳。这些球形结构表现出优异的电化学性能、高可逆容量、优异的循环稳定性（100 mAg下702 mAh/g，100次循环后）和良好的倍率性能（100 mA g-1和2000 mA g-1下分别为735 mAh/g和515 mAh/g）分别）。