3D graphene aerogel framework enwrapped LiFePO4 submicron-rods with improved lithium storage performance

The three-dimensional (3D) graphene aerogel (GA)-wrapped LiFePO4 submicron-rod composite ([email protected]) has been prepared successfully through a solvothermal method followed with rapid freeze-drying. Monodispersed LiFePO4 submicron-rods are well-enwrapped with the graphene sheets and which further form a highly porous and conductive 3D structure, leading to the overall rapid electron transport of the composite electrode and affording many interwoven pores for fast supply of Li+ and storage of electrolyte. Moreover, the combination of the rod-shaped LFP and porous 3D structure can effectively relieve the stress resulted from the structural change during the insertion/deinsertion of Li+. Owing to these particular structure and characteristics, the [email protected] composite presents a high discharge capacity (162.7 mAh g−1 at 0.1 C), a remarkable rate capacity (119.9 mAh g−1 at 5 C) and an excellent long-term cycle stability after 1000 cycles at 1 C (86.5% capacity retention), which is potential for use in Li-ion batteries.