Freestanding carbon fiber-confined yolk-shelled silicon-based anode for promoted lithium storage applications

A flexible carbon fiber-confined yolk-shelled silicon-based composite is reported as an anode material for lithium storage applications. Silicon nanoparticles (Si NPs) are confined by the N-doped hollow carbon cages (Si-NHC) and these uniform dispersed yolk-shell-structured Si-NHC units were encapsulated by the carbon fibers within an interconnected three-dimensional (3D) framework (Si-NHC@CNFs). For the encapsulated yolk-shelled Si-NHC, the void space between the inner Si NPs and outer NHC can accommodate the structural changes of Si NPs during charging/discharging processes, leading to effectively improved structural stability and cycling life. More importantly, all the Si-NHC units were bridged together through a conductive CNFs highway to enhance the overall conductivity and tap density further. As observed, Si-NHC@CNFs exhibited an initial discharge capacity of 1364.1 mAh & BULL;g-1 at 1000 mA & BULL;g-1 and 678.9 mAh & BULL;g-1 at 2000 mA & BULL;g-1. Furthermore, the reversible capacity was well maintained at 752.2 mAh & BULL;g-1 at 500 mA & BULL;g-1 after 6000 ultra-long cycles. (sic)(sic)(sic)(sic)(sic)(sic)(sic)柔(sic)(sic)(sic)纤(sic)(sic)装卵黄硅(sic)(sic)(sic)材(sic)(sic)(sic)锂(sic)池(sic)(sic)材(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)(sic)(sic)ZIF-8(sic)(sic)(sic)?(sic)硅(sic)(sic)颗粒(Si NPs?(sic)装(sic)ZIF-8(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)?(sic)(sic)(sic)卵黄(sic)(sic)(sic)硅(sic)(sic)(sic)(sic)(Si-NHC). (sic)静(sic)纺丝(sic)艺?(sic)(sic)纺丝(sic)(sic)(sic)纤(sic)(sic)(sic)(sic)(sic)?(sic)Si-NHC(sic)(sic)(sic)装(sic)(sic)?(sic)热处(sic)(sic)(sic)(sic)(sic)(sic)柔(sic)纤(sic)(sic)装硅(sic)(sic)(sic)(sic)(sic)(Si-NHC@CNFs?.卵黄(sic)(sic)(sic)?(sic)(sic)(sic)Si NPs(sic)(sic)(sic)NHC(sic)(sic)(sic)(sic)(sic)腔?(sic)(sic)(sic)(sic)缓(sic)Si NPs(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)?(sic)(sic)材(sic)(sic)(sic)(sic)(sic)(sic)(sic).(sic)(sic)(sic)(sic)(sic)?(sic)(sic)Si-NHC(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)CNFs(sic)(sic)(sic)(sic)(sic)(sic)?(sic)(sic)(sic)(sic)(sic)(sic)(sic)材(sic)(sic)(sic)(sic)(sic).Si-NHC@CNFs(sic)1000 mA g-1(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)1364.1 mAh g-1? (sic)2000 mA g-1(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)678.9 mAh g-1. (sic)(sic)?(sic)(sic)(sic)(sic)(sic)(sic)?(sic)500 mA g-1(sic)(sic)(sic)(sic)(sic)?(sic)材(sic)(sic)(sic)(sic)6000(sic)(sic)(sic)(sic)(sic)(sic)?(sic)逆(sic)(sic)仍(sic)(sic)(sic)(sic)752.2 mAh g-1

Automated summary

A flexible carbon fiber-confined yolk-shelled silicon-based composite is reported as an anode material for lithium storage applications. The material exhibits improved structural stability, cycling life, conductivity, and tap density.