Department of Materials Science and Engineering, National University of Singapore , 117574 Singapore.
Centre for Advanced 2D Materials, National University of Singapore , 117546 Singapore.
ACS Appl Mater Interfaces. 2017 Aug 9;9(31):26008-26015. doi: 10.1021/acsami.7b06696. Epub 2017 Jul 25.
For aqueous nickel/metal batteries, low energy density and poor rate properties are among the limiting factors for their applications, although they are the energy storage systems with high safety, high capacity, and low production cost. Here, we have developed a class of active materials consisting of porous nanoflakes of Ni-Co hydroxides and BiO that are successfully assembled on carbon substrates of carbon cloth/carbon nanofiber 3D network (CC/CNF). The combination of the porous Ni-Co hydroxides/BiO nanoflakes with carbon substrate of 3D network is able to provide a large surface area, excellent conductivity, and promote synergistic effects, as a result of the interaction between the active materials and the carbon matrix. With the porous Ni-Co hydroxides and BiO nanoflakes, the Ni/Bi battery can deliver a high capacity of ∼110 mA h g at a current density of 2 A g. About 80% of its capacity (85 mA h g) can be retained when the current density increases to 20 A g. The full cell can also maintain 93% of the initial capacity after 1000 charge/discharge cycles, showing great potential for Ni/Bi battery.
对于水系镍/金属电池，尽管它们是具有高安全性、高容量和低成本的储能系统，但能量密度低和倍率性能差仍是其应用的限制因素。在这里，我们开发了一类由多孔 Ni-Co 氢氧化物和 BiO 的纳米薄片组成的活性材料，这些纳米薄片成功地组装在碳布/碳纳米纤维 3D 网络（CC/CNF）的碳基底上。多孔 Ni-Co 氢氧化物/BiO 纳米薄片与 3D 网络碳基底的结合能够提供大的表面积、优异的导电性并促进协同效应，这是由于活性材料与碳基质之间的相互作用。多孔 Ni-Co 氢氧化物和 BiO 纳米薄片使得 Ni/Bi 电池在 2 A g 的电流密度下能够提供约 110 mA h g 的高容量。当电流密度增加到 20 A g 时，其容量的 80%（85 mA h g）可以保留。全电池在 1000 次充放电循环后仍能保持初始容量的 93%，显示出 Ni/Bi 电池的巨大潜力。
