Abstract The nanostructured hybrids composed of binary transition metal oxides (bi-TMOs) have emerged as promising anode materials in lithium ion batteries (LIBs) because of their unique physicochemical properties. Herein, we report ZnO/CoO mesoporous microspheres encapsulated by nitrogen-doped carbon shells (ZnO–CoO@NC) via self-templated solvothermal synthesis and subsequent in-situ pyrolysis of polypyrrole. The core of nanohybrid is derived from single-phase ZnCo2O4 microspheres and consists of uniform two-phase ZnO/CoO nanocrystals with interparticle mesopores. By virtue of the conductive layer of N-doped carbon and the interaction between mixed ZnO and CoO, the ZnO–CoO@NC mesoporous microspheres manifest the superior lithium storage properties as anode for LIBs, which exhibits the high Li+ storage capacity and the excellent cycling performance (1457 mAh g−1 at 0.5 A g−1 after 500 cycles), along with the competitive rate capability (381 mAh g−1 at 5 A g−1).

中文翻译：

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单相ZnCo2O4衍生的ZnO-CoO介孔微球被氮掺杂碳壳包裹作为高性能锂离子电池的负极

摘要 由二元过渡金属氧化物（bi-TMOs）组成的纳米结构杂化物由于其独特的物理化学性质而成为锂离子电池（LIBs）中很有前途的负极材料。在此，我们通过自模板溶剂热合成和随后的聚吡咯的原位热解，报告了由氮掺杂碳壳（ZnO-CoO@NC）包裹的 ZnO/CoO 介孔微球。纳米杂化物的核心来源于单相 ZnCo2O4 微球，由均匀的两相 ZnO/CoO 纳米晶体和颗粒间介孔组成。凭借 N 掺杂碳的导电层以及混合 ZnO 和 CoO 之间的相互作用，ZnO-CoO@NC 介孔微球作为 LIB 的负极表现出优异的储锂性能，