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首页> 外文期刊>RSC Advances >Facile synthesis of flower-like hierarchical NiCo2O4 microspheres as high-performance cathode materials for Li-O-2 batteries
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Facile synthesis of flower-like hierarchical NiCo2O4 microspheres as high-performance cathode materials for Li-O-2 batteries

机译：花状NiCo2O4分层微球的轻松合成，作为Li-O-2电池的高性能正极材料

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摘要

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 NiCo2O4 microspheres as an effective cathode catalyst for Li-O-2 batteries. The synthesized NiCo2O4 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 Li2O2 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 NiCo2O4. Meanwhile, flower-like NiCo2O4 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 NiCo2O4 nanoneedles and bare carbon cathode. The superior electrochemical performance of NiCo2O4, together with the facile fabrication approach, makes NiCo2O4 microspheres a promising candidate for Li-O-2 batteries.
机译：开发有效且具有成本效益的催化剂是实用的锂氧（Li-O-2）电池的关键问题之一。在此，我们报告了一种容易合成的花状分层NiCo2O4微球，作为Li-O-2电池的有效阴极催化剂。合成的NiCo2O4微球由松散互连的纳米花瓣组成，可以同时提供足够的活性位点，促进Li + / O-2的质量转移并为Li2O2沉积提供足够的空间。当用作Li-O-2电池的阴极催化剂时，可以获得0.86 V的低放电/充电电压间隙，远低于先前报道的NiCo2O4的结果。同时，与NiCo2O4纳米针和NiCo2O4纳米针相比，花状NiCo2O4表现出更高的放电容量（0.08 mA cm（-2）时为3163 mA hg（-1））和更好的循环稳定性（在500 mA hg（-1）容量极限下为60个循环）。裸碳阴极。 NiCo2O4优异的电化学性能以及简便的制造方法使NiCo2O4微球成为Li-O-2电池的有希望的候选者。

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