Potassium-ion batteries (PIBs) hold great promise as alternatives to lithium ion batteries in post-lithium age, while face challenges of slow reaction kinetics induced by the inherent characteristics of large-size K⁺. We herein show that creating sufficient exposed edges in MoS₂ via constructing ordered mesoporous architecture greatly favors for improved kinetics as well as increased reactive sites for K storage. The engineered MoS₂ with edge-enriched planes (EE-MoS₂) is featured by three-dimensional bicontinuous frameworks with ordered mesopores of ∼ 5.0 nm surrounded by thin wall of ∼9.0 nm. Importantly, EE-MoS₂ permits exposure of enormous edge planes at pore walls, renders its intrinsic layer spacing more accessible for K⁺ and accelerates conversion kinetics, thus realizing enhanced capacity and high rate capability. Impressively, EE-MoS₂ displays a high reversible charge capacity of 506 mAh·g⁻¹ at 0.05 A·g⁻¹, superior cycling capacities of 321 mAh·g⁻¹ at 1.0 A·g⁻¹ after 200 cycles and a capacity of 250 mAh·g⁻¹ at 2.0 A·g⁻¹, outperforming edge-deficient MoS₂ with nonporous bulk structure. This work enlightens the nanoarchitecture design with abundant edges for improving electrochemical properties and provides a paradigm for exploring high-performance PIBs.

在后锂时代，钾离子电池（PIB）有望替代锂离子电池，同时面临着由大尺寸K ⁺的固有特性引起的慢反应动力学的挑战。我们在此表明​​，通过构造有序的介孔结构在MoS ₂中创建足够的暴露边缘，极大地有利于改善动力学以及增加钾存储的反应位。具有边缘富集平面的工程MoS ₂（EE-MoS ₂）具有三维双连续框架的特征，该框架具有约5.0 nm的有序介孔和约9.0 nm的薄壁。重要的是，EE-MoS ₂允许在孔壁处暴露出巨大的边缘平面，从而使其内在层间距更易被K ⁺吸收，并加速了转化动力学，从而实现了增强的容量和高倍率容量。令人印象深刻的是，EE-MoS ₂在0.05 A·g ^-1时显示出506 mAh·g ^-1的高可逆充电容量，在200次循环后在1.0 A·g ^-1时显示出优异的循环容量321 mAh·g ^-1在2.0 A·g ^-1下达到250 mAh·g ^-1的性能，优于边缘缺陷MoS ₂具有无孔的散装结构。这项工作启发了具有丰富边缘的纳米结构设计，以改善电化学性能，并为探索高性能PIB提供了范例。