CoO hierarchical mesoporous nanospheres@TiO2@C for high-performance lithium-ion storage
CoO hierarchical mesoporous nanospheres@TiO2@C for high-performance lithium-ion storage
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DOI：
10.1016/j.apsusc.2021.149810
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发表时间：
2021-08
影响因子：
6.7
通讯作者：
Yongfeng Yuan;Weijie Zhao;L. Chen;G. Cai;Shao-yi Guo
中科院分区：
文献类型：
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作者：
Yongfeng Yuan;Weijie Zhao;L. Chen;G. Cai;Shao-yi Guo
分级介孔结构是锂离子电池和其他储能器件理想的活性材料结构。在这项工作中，我们报告了一种通用的螯合-碳化-氧化路径，以Co-甘油酸无机-有机杂化球为前驱体合成CoO纳米晶组装的分级介孔纳米球，然后涂覆TiO2和无定形碳。电化学测试表明，作为锂离子电池负极，所制备的CoO@TiO2@C表现出高可逆容量、稳定的循环性能和良好的倍率性能。在0.5 A g−1的电流密度下，经过200次循环后，其放电容量可达1136 mAh g−1，即使在5 A g−1的高电流密度下，平均放电容量仍可达493 mAh g−1。优异的储锂性能得益于多重结构优势。纳米晶组装的分级介孔纳米球赋予CoO高电化学活性。坚固的 TiO2 和无定形碳壳提高了 CoO 分级介孔纳米球的结构稳定性和电子电导率。
The hierarchical mesoporous structure is an ideal active material structure for lithium-ion batteries and other energy storage devices. In this work, we report a universal chelation-carbonization-oxidation path to synthesize CoO nanocrystalline-assembled hierarchical mesoporous nanospheres with Co-glycerate inorganic-organic hybrid spheres as the precursor, followed by the coating of TiO2and amorphous carbon. The electrochemical measurements demonstrate, as an anode of lithium-ion batteries, as-prepared CoO@TiO2@C exhibits high reversible capacity, stable cycling performance and good rate capability. It can deliver discharge capacity of 1136 mAh g−1after 200 cycles at current density of 0.5 A g−1and average discharge capacity of 493 mAh g−1even at high current density of 5 A g−1. The excellent lithium storage performance benefits from the multiple structural advantages. The nanocrystalline-assembled hierarchical mesoporous nanosphere endows CoO with high electrochemical activity. The robust TiO2and amorphous carbon shells improve structure stability and electronic conductivity of CoO hierarchical mesoporous nanospheres.