Ultrafine metatitanic acid electrode for ultrafast lithium ion batteries

Energy storage devices that can perform both high power and high energy operations are greatly needed for hybrid and plug-in hybrid electric vehicles and for systems by which the power generation is distributed. Here we show an easily prepared electrode material for lithium ion batteries which demonstrates high energy density, outstanding rate capabilities and long cycle life, comparable to those of supercapacitors. At a rate equivalent to a 6-minute total charge/discharge, the as-prepared metatitanic acid exhibits a life of over 7000 charge/discharge cycles while still retaining up to 87.5% of its original capacity. Furthermore, the electrode using this material can be fully charged in one minute while still maintaining a high energy density.

► Synthesized ultrafine metatitanic acid via a highly economical and uncomplicated method.
► Retain 87.5% of its capacity after 7000 cycles at 10C.
► Material partially contains amorphous phase and stable protons.
► Two-phase transformation and pseudo-capacitive energy storage mechanisms.
► Increased Li+ ion mobility and decreased lattice distortion.