Abstract
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 (LFP@OFC) 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 LFP@OFC 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.
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