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Oxygen‐containing functional groups (OFGs) grafted by carbon materials surface can serve as active sites to reversibly store potassium and simultaneously contribute to forming a stable solid‐electrolyte interphase layer, leading to increased capacity and cycling stability. However, the excessive OFGs will damage conductivity and hence causes the increase in electron transfer resistance, easily resulting...
Pore‐structure design with increased ion‐diffusion ability is usually regarded as an effective strategy to improve K‐storage performance in hard carbon (HC). However, the relationship between porous structure and K+ migration behavior remains unclear and requires further exploration. Herein, a series of chemically activated hard carbon spheres (denoted as AHCSs) with controllable micro/mesopores structure...