Encapsulation of nano-Si into MOF glass to enhance lithium-ion battery anode performances

Although metal-organic framework (MOF) glasses have exhibited high potential to be applied as anode materials for lithium-ion batteries (LIBs), their electrochemical performances still need greatly improved match the rapid development of green energy technologies. Silicon is a promising candidate next generation LIB but suffers from vast volume fluctuations upon lithiation/delithiation. Here, we present strategy in situ grow kind MOF, namely, cobalt-ZIF-62 (Co(imidazole) 1.75 (benzimidazole) 0.25 ) on surface Si nano particles, and then transform thus-derived material into Si@ZIF-glass composite (SiZGC) through melt-quenching. The robust hierarchical structure SiZGC based exhibits specific capacity ~650 mA h g -1 , which about three times that pure ZIF glass six pristine crystal at 1 A after 500 cycles. origin this huge enhancement revealed by performing structural analyses. phase can not only contribute lithium storage, also buffer changes prevent aggregation particles during lithiation/delithiation processes. • By encapsulating nano-Si ZIF-62 glass, made LIBs. encapsulation was realized combining reflux melt-quenching methods. 3 anode. This achieved synergy effect glass. expansion powder buffered phase.