Carbon‐encapsulated anionic‐defective MnO/Ni open microcages: A hierarchical stress‐release engineering for superior lithium storage

• DOI: 10.1002/cey2.226
• Publication Date: 2022-06-22T12:51:00Z
• Authors: Jia Lin; Yingying Peng; Reddivari Chenna ...; Akif Zeb; Xiaoming Lin; Yan‐Hui Sun
• Keywords: Structural Stability

Abstract Rational manipulation of multicomponent materials into a sophisticated architecture is prerequisite for developing lithium‐ion batteries. However, mechanical diffusion‐induced strain accumulation leads to sluggish diffusion kinetics and anomalous structure instability, further resulting in inferior long‐term cyclability rate performance. Herein, the von Mises stress distribution on open microcages composed secondary nanoparticles (OCNs) mechanically investigated by finite element simulation, which elucidates pronounced stress‐release effect OCNs architecture. Afterward, facile metal–organic framework‐derived methodology proposed constructing multihierarchical carbon‐encapsulated oxygen vacancy‐enriched MnO/Ni (O V ‐MnO/Ni OCNs). Due structural compositional integration, O achieve extraordinary lithium storage performance with excellent reversible capacity (1905.1 mAh g −1 at 0.2 A ), ultrahigh cycling stability (1653.5 2 up 600 cycles), considerable capability (463.3 even 10 ). The primary mechanisms are systematically determined experimental theoretical investigations. enriched vacancies, metallic Ni configuration, N‐doped carbonaceous matrix provide more active sites, construct omnidirectional pathways, suppress volume expansion, boost electronic conductivity, thus yielding an exceptional diffusivity coefficient expedited electrochemical kinetics. This study offers profound insights elaborate design multicompositional electrodes toward advanced energy application development.