Potassium metal is one of the most promising anode materials for potassium-ion batteries owing to its low cost and ability to withstand high current density and relatively low operating potential. However, it is restricted from being used in practical implementations because of its high reactivity and disordered dendrite growth. To circumvent these issues, we stabilize potassium metal anodes by growing NiO with high potassium affinity and interconnected network porous structure on carbon cloth fibers (CC-NiO). A symmetric cell assembled from a composite material formed by infiltrating molten K into CC-NiO (K@CC-NiO) can cycle stably for 1840 h at a low overpotential of 33 mV. Furthermore, the first-cycle discharge capacities of the full batteries with carbon nanotubes-interwoven KFeSOF microspheres (KFSF@CNTs) and perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) as the cathodes are 101.4 and 105.1 mAh g, respectively. The capacity retention of KFSF@CNTs||K@CC-NiO full battery after 1000 cycles is 79.3 %, and the capacity retention of PTCDA||K@CC-NiO full battery after 800 cycles is 70.2 %. The strategy of utilizing NiO as an efficient potassium metal nucleation anchor opens up a new direction for the development of high-energy and long-cycle-life potassium metal batteries.

中文翻译：

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用于高效自支撑钾金属阳极的纳米网状氧化镍改性碳布

钾金属由于其成本低廉、能够承受高电流密度和相对较低的工作电位，是最有前途的钾离子电池负极材料之一。然而，由于其高反应性和无序枝晶生长，其在实际应用中的使用受到限制。为了解决这些问题，我们通过在碳布纤维上生长具有高钾亲和力和互连网络多孔结构的 NiO（CC-NiO）来稳定钾金属阳极。由熔融K渗入CC-NiO（K@CC-NiO）形成的复合材料组装而成的对称电池可以在33 mV的低过电位下稳定循环1840小时。此外，以碳纳米管交织KFeSOF微球（KFSF@CNTs）和苝-3,4,9,10-四甲酸二酐（PTCDA）为正极的全电池首次循环放电容量分别为101.4和105.1 mAh g，分别。 KFSF@CNTs||K@CC-NiO全电池1000次循环后的容量保持率为79.3%，PTCDA||K@CC-NiO全电池800次循环后的容量保持率为70.2%。利用NiO作为高效钾金属成核锚的策略为高能、长循环寿命钾金属电池的发展开辟了新方向。