Uncovering the design principle of conversion-based anode for potassium ion batteries via dimension engineering

Water‐Soluble Salt Template‐Assisted Anchor of Hollow FeS2 Nanoparticle Inside 3D Carbon Skeleton to Achieve Fast Potassium‐Ion Storage

“…Recently, transition metal sulfides (such as MoS 2 , CoS, and CuS) have aroused extensive attention in view of their high theoretical capacities, decent redox reversibilities, and low‐cost. [ 14–21 ] Nevertheless, most of the metal sulfides materials exhibit inferior rate capability and rapid capacity degradation because of their poor electrical conductivity and unavoidable structure collapse incurred by repeated K‐ions insertion and extraction process. [ 18,22 ] To address above issue, constructing a hybrid structure with carbon materials has been employed as an efficient strategy to improve the comprehensive performance of electrode materials.…”

“…[ 15,22,27,28 ] Beyond carbon hybridization, the rationally structural engineering is another effective route for improving the K‐ions storage performance. [ 16,18,29 ] Particularly for electrode materials, the 3D hollow configuration including yolk‐shell structure, capsule‐like architecture, hollow tubular skeleton, and hierarchical hollow structure have been extensively studied to boost K‐ions storage properties. [ 10,29–34 ] The nanoscale hollow configuration can not only shorten the K‐ions and electrons diffusion path, but also provide enough space to accommodate volume expansion and avoid exfoliation of active materials from the electrodes.…”

“…[ 10,29–34 ] The nanoscale hollow configuration can not only shorten the K‐ions and electrons diffusion path, but also provide enough space to accommodate volume expansion and avoid exfoliation of active materials from the electrodes. [ 16,35 ] Based on the aforementioned considerations, it would be of great interests by integrating these advantages into one alliance to optimize their potential for high‐performance K‐ions storage.…”

Synchrotron X‐Ray Tomography for Rechargeable Battery Research: Fundamentals, Setups and Applications

“…Reproduced with permission. [ 177 ] Copyright 2021, Elsevier. c) 3D rendered volume of the Celgard 2325 (green) and GF/D (gray) within a K symmetrical cell after discharging at 0.5 mA cm –2 , where K electrodeposits are marked as yellow.…”

“…Using this technique, Liang et al. [ 177 ] characterized the detailed structure of the NiS 2 anode material for potassium‐ion batteries (PIBs), as shown in Figure 15b. The characterization results clearly depicted the interconnected visual ion diffusion paths within the multi‐dimensional structure.…”