Metal-organic framework-derived LiFePO4 cathode encapsulated in O,F-codoped carbon matrix towards superior lithium storage

LiFePO4 renders as a prevailing commercialized cathode material for lithium-ion batteries (LIBs). However, due to its intrinsic inferior electronic conductivity and sluggish diffusion kinetics, it necessitates orchestrated efforts to surmount the suppressed rate capability. Herein, a metal-organic framework (MOF)-derived synthetic methodology for LiFePO4 microparticles encapsulated in O,F-codoped carbon matrix ([email protected]) via solid-state sintering is proposed as a versatile cathode material for LIBs. Enlightened by experimental investigation and theoretical calculation, the porous carbon matrix with O,F-codoped functionalities is energetically preferable for superior adsorption capability coupled with decreased diffusion barriers of Li, further conferring extra active sites, boosted electronic conductivity, and expedited diffusion aisles. Exceedingly, the [email protected] achieves pre-eminent electrochemical performance with exceptional specific capacity (169.9 mAh g−1 at 0.1 C), fabulous rate capacity (85.6 mAh g−1 even at 16.2 C), and distinguished long-term cyclability (160.9 mAh g−1 over 500 loops at 1 C). This work envisions an insightful construction of MOF-derived carbonaceous cathode materials in prospect of outstanding rate and cycling performance for prospective application and development.