Key Laboratory of Energy Materials Chemistry, Ministry of Education, Institute of Applied Chemistry , Xinjiang University , Urumqi 830046 Xinjiang , China.
State Key Lab of Fine Chemicals, School of Chemical Engineering , Dalian University of Technology , Dalian 116023 , China.
ACS Appl Mater Interfaces. 2019 Feb 20;11(7):7006-7013. doi: 10.1021/acsami.8b20366. Epub 2019 Feb 8.
Highly crystalized CoMoO hexagonal nanoplates interconnected by coal-derived carbon have been successfully fabricated by the molten-salt-assisted method. The formation process of the nanostructural hybrids via molten salts is proposed. The eutectic salts with low melting points act as ionic liquid solvents and "molecular templates" at high temperature, making cobalt and molybdenum salts react in the form of bare ions to get the regular CoMoO hexagonal nanoplates interconnected by conductive carbon. In addition, the crystallinity of CoMoO hexagonal nanoplates is increased with the help of molten salts. The effects of temperature on morphology and electrochemical performance of the composites were studied. Thanks to the unique structure design, the optimal composite obtained by this simple low-cost strategy exhibits remarkable electrochemical performance as anodes for lithium-ion batteries, which reveals a high reversible capacity of 1075 mA h g at 200 mA g and 596 mA h g at 1000 mA g after 100 cycles. More importantly, the sample shows good rate capability with a high capacity of 533 mA h g at a high current density of 4000 mA g. The molten-salt-assisted method is also applicable to design and synthesize other metal oxide-based Li-ion battery anodes.
通过熔融盐辅助法成功制备了由相互连接的煤衍生碳交联的高度结晶 CoMoO 六方纳米板。提出了通过熔融盐形成纳米结构杂化物的过程。低熔点共晶盐在高温下充当离子液体溶剂和“分子模板”,使钴盐和钼盐以裸露离子的形式反应,得到由导电碳交联的规则 CoMoO 六方纳米板。此外,熔融盐有助于提高 CoMoO 六方纳米板的结晶度。研究了温度对复合材料形貌和电化学性能的影响。由于独特的结构设计,通过这种简单且低成本策略获得的最佳复合材料作为锂离子电池的阳极表现出显著的电化学性能,在 200 mA g 时具有 1075 mA h g 的高可逆容量,在 1000 mA g 时具有 596 mA h g 的高可逆容量,经过 100 次循环后。更重要的是,该样品在高电流密度 4000 mA g 时具有 533 mA h g 的高容量,表现出良好的倍率性能。熔融盐辅助法也适用于设计和合成其他基于金属氧化物的锂离子电池阳极。