Functional Thin Films Research Center, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
Nano Science and Technology Institute, University of Science and Technology of China, Suzhou, 215123, China.
Adv Mater. 2017 May;29(19). doi: 10.1002/adma.201700519. Epub 2017 Mar 15.
In this work, combining both advantages of potassium-ion batteries and dual-ion batteries, a novel potassium-ion-based dual-ion battery (named as K-DIB) system is developed based on a potassium-ion electrolyte, using metal foil (Sn, Pb, K, or Na) as anode and expanded graphite as cathode. When using Sn foil as the anode, the K-DIB presents a high reversible capacity of 66 mAh g at a current density of 50 mA g over the voltage window of 3.0-5.0 V, and exhibits excellent long-term cycling performance with 93% capacity retention for 300 cycles. Moreover, as the Sn foil simultaneously acts as the anode material and the current collector, dead load and dead volume of the battery can be greatly reduced, thus the energy density of the K-DIB is further improved. It delivers a high energy density of 155 Wh kg at a power density of 116 W kg , which is comparable with commercial lithium-ion batteries. Thus, with the advantages of environmentally friendly, cost effective, and high energy density, this K-DIB shows attractive potential for future energy storage application.
在这项工作中，结合了钾离子电池和双离子电池的优点，开发了一种新型的基于钾离子的双离子电池（命名为 K-DIB）系统，该系统基于钾离子电解质，使用金属箔（Sn、Pb、K 或 Na）作为阳极，膨胀石墨作为阴极。当使用 Sn 箔作为阳极时，在电压窗口为 3.0-5.0 V、电流密度为 50 mA g 的条件下，K-DIB 呈现出 66 mAh g 的高可逆容量，并且具有出色的长期循环性能，在 300 次循环后容量保持率为 93%。此外，由于 Sn 箔同时充当阳极材料和集流体，电池的死重和死体积可以大大降低，从而进一步提高了 K-DIB 的能量密度。在 116 W kg 的功率密度下，它提供了 155 Wh kg 的高能量密度，与商业锂离子电池相当。因此，由于具有环保、经济高效和高能量密度的优势，这种 K-DIB 显示出了在未来储能应用中的吸引力。
