Critical Investigation of Metal–Organic-Frameworks to Improve the Silicon Anode of Lithium-Ion Batteries
James Sturman, Mohamed S.E. Houache, Walace D. do Pim, Elena A. Baranova, Muralee Murugesu, Yaser Abu‐Lebdeh
Abstract
High Resolution Image Download MS PowerPoint Slide The poor capacity retention of the silicon (Si) anode has hindered its widespread use in lithium-ion batteries. Metal–organic-frameworks (MOF) may offer the structural and functional tunability needed to alleviate some of the longstanding problems associated with silicon pulverization. Herein, MOF-74 (Co-based) and MOF-199 (Cu-based) were implemented in different design configurations for high-Si loading electrodes. Multilayer sandwich configurations provided a modest improvement in capacity retention. However, greatest improvements in capacity retention were observed when the MOF was in situ synthesized onto the silicon surface (Si@MOF) and subsequently pyrolyzed. The best performing high-loading 0.5Si@MOF-c sample delivered a high capacity of 1000 mAh/g and retained 60% capacity after 100 cycles, surpassing a standard silicon-graphite composite.