Abstract Urchin-like NiCo2O4 particles were prepared by a facile hydrothermal method and conductive polypyrrole (PPy) coatings were formed on the surface of the NiCo2O4 particles by the chemical oxidative polymerization of pyrrole monomers. The effects of the PPy content on the electrochemical properties of the NiCo2O4/PPy composites were investigated. The 30 wt% NiCo2O4/PPy sample exhibited excellent electrochemical performance; the reversible specific capacity was 1164.9 mAh/g after 100 cycles at a current density of 200 mA/g, indicating an improvement in the electrochemical performance of the composite material.

中文翻译：

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NiCo2O4/PPy复合材料的可控合成及储锂性能

摘要 采用简便的水热法制备了海胆状NiCo2O4颗粒，并通过吡咯单体的化学氧化聚合在NiCo2O4颗粒表面形成导电聚吡咯(PPy)涂层。研究了PPy含量对NiCo2O4/PPy复合材料电化学性能的影响。30 wt% NiCo2O4/PPy 样品表现出优异的电化学性能；在200 mA/g的电流密度下循环100次后，可逆比容量为1164.9 mAh/g，表明复合材料的电化学性能有所提高。