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Facile synthesis of flower-like hierarchical NiCo2O4 microspheres as high-performance cathode materials for Li–O2 batteries

机译:浅析花样的分层NicO2O4微球,作为LI-O2电池的高性能阴极材料

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Development of efficient and cost-effective catalyst is one of the key issues for practical lithium–oxygen (Li–O _(2) ) batteries. Herein, we report a facile synthesis of flower-like hierarchical NiCo _(2) O _(4) microspheres as an effective cathode catalyst for Li–O _(2) batteries. The synthesized NiCo _(2) O _(4) microsphere consists of loosely interconnected nanopetals, which could simultaneously offer sufficient active sites, facilitate mass transfer of Li ~(+) /O _(2) and provide enough space for Li _(2) O _(2) deposition. When employed as the cathode catalyst for Li–O _(2) batteries, a low discharge/charge voltage gap of 0.86 V can be obtained, much lower than previously reported results for NiCo _(2) O _(4) . Meanwhile, flower-like NiCo _(2) O _(4) shows improved discharge capacity (3163 mA h g ~(?1) at 0.08 mA cm ~(?2) ) and better cycle stability (60 cycles at 500 mA h g ~(?1) capacity limit) compared with NiCo _(2) O _(4) nanoneedles and bare carbon cathode. The superior electrochemical performance of NiCo _(2) O _(4) , together with the facile fabrication approach, makes NiCo _(2) O _(4) microspheres a promising candidate for Li–O _(2) batteries.
机译:高效且经济高效的催化剂的开发是实际锂 - 氧气(Li-O _(2))电池的关键问题之一。在此,我们报告了作为Li-O _(2)电池的有效阴极催化剂的花状分层NiCO _(2)o o _(4)微球的容易合成。合成的Nico _(2)O _(4)微球由松散的相互连接的纳米行动组成,它可以同时提供足够的活性位点,促进Li〜(+)/ O _(2)的传质转移,并为Li _提供足够的空间( 2)O _(2)沉积。当用作Li-O _(2)电池的阴极催化剂时,可以获得低放电/充电电压间隙,可以获得0.86V的低放电/充电电压间隙,远远低于先前报道的Nico _(2)O _(4)的结果。同时,花样的Nico _(2)O _(4)显示出改善的放电容量(3163 mA Hg〜(α1),0.08 mA cm〜(Δ2))和更好的循环稳定性(500 mA Hg〜60次循环〜 (?1)容量限制)与Nico _(2)O _(4)纳米纳米块和裸碳阴极相比。 Nico _(2)O _(4)的卓越的电化学性能以及容易制造方法,使NiCO _(2)O _(4)微球是Li-O _(2)电池的有希望的候选者。

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