Mesoscopic Ti2Nb10O29 cages comprised of nanorod units as high-rate lithium-ion battery anode.

Abstract Benefiting from large tunnel structure, zero strain feature, and excellent pseudocapacitive performance, Ti2Nb10O29 was considered as a potential anode material for lithium-ion batteries (LIBs). Herein, Ti2Nb10O29 cages comprised of nanorod units were elaborately designed. The mesoscopic structure could effectively shorten the ion diffusion pathway, and the big central electrolyte reservoir relieves the concentration polarization of electrolyte. Moreover, the perforated pore feature guarantees competent contact between electrolyte and framework. As the anode of LIBs, the mesoscopic Ti2Nb10O29 cages deliver high reversible capacity (302.5 mAh/g) and rate capability (134.3 mAh/g at 30 A/g). This unique mesoscopic structure holds excellent potential for the electrode design of high-rate and long-life LIBs.