阳极
控制重构
材料科学
电解质
纳米技术
电极
化学工程
化学
计算机科学
工程类
嵌入式系统
物理化学
作者
Yulian Dong,Changfan Xu,Yueliang Li,Chenglin Zhang,Huaping Zhao,Ute Kaiser,Yong Lei
标识
DOI:10.1002/aenm.202204324
摘要
Abstract Despite their variable valence and favorable sodiation/desodiation potential, vanadium sulfides (VS x ) used as anode materials of sodium‐ion batteries (SIBs) have been held back by their capacity decline and low cycling capability, associated with the structure distortion volume expansion and pulverization. This study reports an accessible process to tackle these challenges via fabricating a 3D‐VS x anode for SIBs with ultrahigh‐rate and ultralong‐duration stable sodium storage. The sodiation‐driven reactivation of micro‐nano 3D‐VS x activates the reconfiguration effect, effectively maintaining structural integrity. Interestingly, the mechanical degradation of 3D‐VS x over the sodiation process can be controlled by fine‐tuning the operating voltage. The self‐reconfigured open nanostructures with large void space not only effectively withstand repetitive volume changes and mitigate the damaging mechanical stresses, but also in turn construct a self‐optimized shortened ion diffusion pathway. Moreover, the sodiation‐driven reconfiguration excites many active sites and optimizes a stable solid‐electrolyte interface, thereby delivering a reversible capacity of 961.4 mA h g −1 after 1500 cycles at a high rate of 2 A g −1 . This work provides new insight into the rational design of electrodes toward long‐lived SIBs through sodiation‐driven reconfiguration.
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