Rational design of nano-FeOencapsulated in 3D honeycomb biochar for enhanced lithium storage performance.

Developing green materials applied in lithium-ion batteries is of significant importance for the present-day society. Herein, a feasible strategy to construct FeOnanoparticles (NPs) embedded in three-dimensional (3D) honeycomb biochar derived from pleurotus eryngii was proposed. The obtained material consists of FeONPs (35-85 nm) encapsulated in 3D honeycomb biochar possesses a high specific capacity of 723 mAh gat 1.5 A gafter 1000 cycles. The effectively enhanced cycling life of FeO@C nanocomposites can be ascribed to the small FeONPs provide lower degree of cracking and high specific capacity, while the honeycomb biochar function like a cage to inhibit huge volume change of FeONPs during the charge-discharge process.