In Situ Synthesis of Porous Plate‐Like Li4Ti5O12 Lithium‐Ion Battery Anode with Advanced Li+ Storage Mechanism and Enhanced Electrochemical Kinetics

Abstract Spinel Li 4 Ti 5 O 12 as the anode material for lithium‐ion batteries possessed “zero strain” characteristics, high safety, good stability, rapid Li + diffusion rate, and fast charging and discharging performance, and has been used commercially. In this work, a porous plate‐like structure for Li 4 Ti 5 O 12 is constructed via an economic in situ topological reaction with H 1.07 Ti 1.73 O 4 ·H 2 O as the precursor. In terms of Li + storage, not only the typical intercalation reaction of Li 4 Ti 5 O 12 can be fully carried out, but also the Li + storage in the form of pseudocapacitance can be introduced due to its porous structure, thus the enhanced Li + storage mechanism can be realized and the reversible capacity in the work (197 mAh g −1 at 0.1 A g −1 ) break the bottleneck of 175 mAh g −1 for Li 4 Ti 5 O 12 . In terms of electrochemical reaction kinetics, its plate‐like shape effectively avoids agglomeration of particles reducing the charge transfer resistance, and the micropores increase the diffusion rate of Li + (3.3 times faster than the commercial Li 4 Ti 5 O 12 nanoparticles). During the practical test, it can maintain the reversible capacity of 134 mAh g −1 after 1000 cycles at the huge current density of 1.0 A g −1 and show good compatibility with commercial LiFePO 4 cathode, which proves its great practical potential for LIBs.