Atomic‐Scale Laminated Structure of O‐Doped WS<sub>2</sub> and Carbon Layers with Highly Enhanced Ion Transfer for Fast‐Charging Lithium‐Ion Batteries
Zhenwei Li, Yuan Fu, Meisheng Han, Jie Yu
Abstract
Abstract WS 2 anode materials show huge potential for fast‐charging lithium‐ion batteries (LIBs) due to the naturally good 2D diffusion pathways but suffer from large Li + diffusion barrier energy and poor intrinsic electrical conductivity. Here, a defect‐rich atomic‐scale laminated structure of WS 2 and C (D‐WS 2 ‐C) with O doping and enlarged interlayer distance from 0.62 to 1.06 nm of WS 2 is first fabricated, which is assembled into micron‐sized spheres to prepare WS 2 /C composite microspheres. D‐WS 2 ‐C with maximized molecular layer contact area between WS 2 and carbon and large interlayer spacing greatly enhances the electrical conductivity of WS 2 and reduces Li‐ion diffusion energy barrier, confirmed by density functional theory calculations. Besides, the unique D‐WS 2 ‐C enables the formation of vast superfine W nanoparticles (1–2 nm) during the conversation reaction, resulting in the construction of a space charge zone on W surface. Based on these characteristics of D‐WS 2 ‐C, the prepared WS 2 /C composite microspheres show superior fast‐charging capability with a high capacity of 647.8 mAh g −1 at 20 C in half cells. For full cells, a high‐energy density of 100.9 Wh kg −1 is achieved at a charge time of only 8.5 min at 5 C, representing the best fast‐charging performances in WS 2 ‐based anode materials to date.