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首页> 外文期刊>RSC Advances >Carbonate-assisted hydrothermal synthesis of porous, hierarchical CuO microspheres and CuO/GO for high-performance lithium-ion battery anodes
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Carbonate-assisted hydrothermal synthesis of porous, hierarchical CuO microspheres and CuO/GO for high-performance lithium-ion battery anodes

机译：碳酸酯辅助水热合成多孔，分层CuO微球和CuO / GO用于高性能锂离子电池阳极

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摘要

Porous, hierarchical CuO microspheres (MSs) have been successfully synthesized through a facile, surfactant-free carbonate-assisted hydrothermal method. A growth mechanism based on self-aggregation and decomposition of precursor Cu-2(OH)(2)CO3 nanoparticles and Ostwald ripening under hydrothermal conditions is proposed to explain the formation of CuO MSs. Then the CuO MSs are encapsulated with GO through engineering the ionic strength in solution and applied as anode materials for lithium ion batteries, which demonstrates that CuO/GO exhibits significant improvements over the bare CuO MSs. It can deliver a high reversible capacity of 500 mA h g(-1) after 500 cycles, with 80% capacity retention of the second reversible capacity (625.8 mA h g(-1)) at a current density of 0.5C. This is much higher than 233.5 mA h g(-1) of the bare CuO MSs at the same rate. Such significantly enhanced electrochemical performance of the CuO/GO hybrid can be attributed to the synergistic effect of successful integration of the CuO MSs with the highly conductive and flexible GO sheets. This study demonstrates that facile structural tuning of the metal oxide in combination with advantageous carbon materials is a promising way to fabricate anodes for high-performance lithium-ion batteries.
机译：通过一种简便的，无表面活性剂的碳酸盐辅助水热方法，成功地合成了多孔，分层的CuO微球（MSs）。提出了基于前体Cu-2（OH）（2）CO3纳米粒子的自聚集和分解以及水热条件下奥斯特瓦尔德熟化的生长机理来解释CuO MS的形成。然后通过工程化溶液中的离子强度，用GO封装CuO MS，并将其用作锂离子电池的负极材料，这表明CuO / GO与裸CuO MS相比具有显着的改进。在500次循环后，它可提供500 mA h g（-1）的高可逆容量，在0.5C的电流密度下，第二可逆容量（625.8 mA h g（-1））的容量保持率为80％。这比相同速率下的裸CuO MS的233.5 mA h g（-1）高得多。 CuO / GO杂化物的这种显着增强的电化学性能可归因于CuO MS与高导电性和柔性GO板成功整合的协同效应。这项研究表明，将金属氧化物与有益的碳材料结合起来进行简便的结构调整，是制造高性能锂离子电池阳极的一种有前途的方法。

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