Among multitudinous recommendations, Li 4 Ti 5 O 12 (LTO) is considered as a promising anode material owing to its steady operating voltage platform at 1.55 V (versus Li/Li + ), which can prevent the growth of lithium dendrites. [5] In addition, the zero-strain insertion characteristic makes it possess excellent cycle performance and stability. [6,7] Meanwhile, the operational voltage of LTO can also prevent the decomposition of most electrolyte. [8] However, the inherent low conductivity (<10 −13 S cm −1 ) [9] and poor ion diffusion coefficient (10 −13 cm 2 s −1 ), [10] limit its large-scale application. In order to solve this problem, researchers have been introduced Cr 3+ into the lattice of LTO, which can not only reduce the average working potential to 1.5 V (versus Li/Li + ), but effectively improve the electrochemical performance. [11] For example, Song et al. reported LCTO formed by doping Cr 3+ into LTO qualified higher capacity especially at high rate, and better ionic diffusivity. [12] Wu et al. found that Cr 3+ doped LCTO exhibits exceptional cycling stability at high current densities. [13] Although the theoretical specific capacity of LCTO is only 157 mAh g −1 , the lower lithium content has advantages in terms of lithium resource requirements. [14] More importantly, the conductivity (10 −6 S cm −1 ) and lithium-ion diffusion coefficient (10 −8 -10 −9 cm 2 s −1 ) have been significantly enhanced compared with LTO. [15,16] Transition metal oxides are elementally abundant and inexpensive, and exhibit excellent stability in redox environments. [17] Therefore, LCTO has become a promising anode material for lithium-ion batteries with superior industrialization potential.In order to realize the industrialization development as soon as possible, a great deal of synthetic technologies have been explored and reported, such as solid-state reaction, [14,18] solgel, [19] electro-spinning, [20] acrylic acid polymerization [21] and sonochemistry. [22] The existing research on LCTO mainly concentrates on two aspects, one effective approach is to increase the conductivity of materials, such as coating and composite carbon materials, [23] or ion doping, [16] which can further ameliorate the electrochemical performance. However, the coating of carbon material will reduce the tap density, so as to reduce the energy density, and there is also a current lag phenomenon at high rate. Another approach is forming nanostructures, [24] which can provide an enormous specific surface area and Lithium-ion battery based on LiCrTiO 4 (LCTO) is considered to be a promising anode material, as they provide higher safety and durability beyond than that of graphite electrode. However, the applications of this transformative technology demand improved inherent electrical conductivity of LCTO as well as a simple and rapid synthetic route. Here, LCTO with oxygen vacancies (OVs) is fabricated using high-pressure synthesis technology in only 40 min. The optimal synthesis pressure is 0.8 GPa (LCTO-0.8). The reversible capacity of LCTO-0.8 at...
